CN1373874A - 在多主机计算环境中用于共享存储卷的主机卷映射系统和方法 - Google Patents
在多主机计算环境中用于共享存储卷的主机卷映射系统和方法 Download PDFInfo
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Abstract
本发明提供一种结构和方法,用于在有多个主计算机(101)的计算机系统和网络中控制对共享存储装置(例如盘驱动器存储器阵列)的访问。一种方法用于在有多个计算机和至少一个硬件装置(106)与这多个计算机相连的计算机系统中控制对该硬件装置的访问。该方法包括如下步骤:使局部唯一标识符(130)与这多个计算机中的每一个相关联;在存储器中定义一个数据结构,用于根据局部唯一标识符标识该计算机中哪一些可被允许访问该装置(190);以及查询该数据结构以确定这些计算机中发请求的一个是否应被允许访问该硬件装置。在一个实施例中,在存储器中定义数据结构的过程包括:在该存储器中定义一个主计算机ID映射数据结构;在该存储器中定义一个包含多个端口映射表条目的端口映射表数据结构;在该存储器中定义一个主机标识符列表数据结构;在该存储器中定义一个卷许可表数据结构;以及在该存储器中定义一个卷号表数据结构。
Description
技术领域
一般而言,本发明涉及具有两个或更多个主计算机和至少一个共享数据存储装置的计算机系统和网络。更具体地说,本发明涉及在具有多个主计算机的计算机系统和网络中,特别是在存储区域网络(SAN)中控制共享存储器访问的结构和方法,这些主计算机可能为共享数据存储器造成数据完整性问题。
背景技术
传统的操作系统通常可能假定任何存储卷(volume)或装置都是“私有的”,而且不在不同的主计算机之间共享。在分布式计算系统中,诸如网络服务器系统中,盘驱动器、存储卷、逻辑卷或其他存储装置可以被共享和代表公共存储器。当一个负责控制对存储装置的读、写或其他访问的控制器,诸如硬盘阵列控制器(例如RAID控制器),被连接到多个主计算机时,例如通过SCSI总线、光纤通道环路或其他存储装置接口连接,便可能产生问题,因为这些多个主计算机中的一个或多个可能会重写或者破坏为另一不同主计算机系统的正确操作所需要的信息。
当这多个主计算机是由具有不同操作系统的不同主计算机的异构(heterogeneous)混合或集合形成时,这一问题特别普遍,但对于主计算机系统的同构(homogeneous)混合或集合,这一问题也存在。
在一个示例场合中,一种类型的操作系统(例如由Sun Microsystems公司制造的计算机中的Unix操作系统)需要在该存储装置的指定地址处的特殊信息,而一种不同的操作系统(例如使用Microsoft公司制造的Windows NT操作系统的计算机)可能需要任何附属的存储器有特殊的标识信息写到这同一存储装置上的同一个或重叠的地址中。这第二类(Windows NT)将重写第一类(Unix)计算机所需要的信息,于是,从Unix计算机的角度看,该存储器将是被破坏的和不可用的。
当主机系统101有类似或相同的硬件以及相同的操作系统时,即对主机系统的同构组合,也能频繁地产生出问题的情况。例如,Windows NT4.0操作系统能代表在同构或异构硬件上的这种问题。每个主计算机(计算机A和计算机B)将向共享存储器阵列的每个盘写一个特殊的标识性“标记(tag)”。最后向该盘或共享存储器阵列写入的任何一个计算机将是“赢家”,因为它的“标记”或“签名”将在上次写操作之后保持原封不动,而其他主机将表现为和被当作它们以前从未看见该存储阵列或该阵列的成员。还有,如果计算机A格式化一个盘,然后另一个计算机B随后也格式化这同一个盘,则计算机A的格式和数据现在都被破坏了。这后一种情景不依赖于各主机操作系统的相似性或差异性。
前面提到了Microsoft Windows NT操作系统,我们要指出的是,尽管本发明的实施示例引用Windows NT、Unix和Novel作为举例,但本发明不限于Windows NT、Unix和Novel或任何其他特定的操作系统环境,相反,它可应用于大范围的计算机系统、服务器系统、信息存储与检索系统等,以及各种操作系统,而且更一般地说,它可应用于任何计算机和/或信息存储/检索系统。
我们现在针对图1描述一个示例性分布式计算机系统100,它有第一、第二和第三主计算机101(101-1、101-2、101-3)与阵列控制器104耦合,该阵列控制器104又与存储子系统108耦合,存储子系统108由一个或多个逻辑卷构成,这里显示为逻辑盘驱动器存储卷(108-1、108-2、108-3…、108-N)阵列。一般地说,这些逻辑卷108可以对应于物理硬盘驱动器装置或这种物理硬盘驱动器装置组。在这一实施例中,三个主计算机101-1、101-2和101-3经由光纤通道环路120通信通道连接到阵列控制器104,而存储子系统的逻辑卷108经由一个适当的通道122连接到阵列控制器104,例如经由光纤通道环路通信通道或并行SCSI通信通道。对于光纤通道环路,除了光纤通道物理层及相关协议和标准外,还经常使用SCSI协议。光纤通道环路120对于主机互连是有利的,因为这类接口对于大量主计算机具有灵活性和可扩展性,还有,针对本发明的结构和方法,有利于现有的对全球范围编号(world wide Number,WWN)识别的支持。
在计算机系统100中,阵列控制器104把存储器分成若干逻辑卷108。这些卷通过逻辑单元号(LUN)寻址方案被访问,这种方案在基于SCSI协议的存储系统(包括基于SCSI协议的光纤通道环路物理层结构)中是通用的。术语LUN是指一个逻辑单元或逻辑卷,或者在基于SCSI协议的装置或系统中是指SCSI逻辑单元或SCSI逻辑卷。本领域普通技术人员将会理解,物理盘驱动器的个数可以与逻辑驱动器或逻辑卷的个数相同或者不同;然而,为了在这里的描述简单明了,我们可互换地使用这些术语,与物理盘驱动器相比,焦点主要放在逻辑卷上。将物理装置赋予、分组或映射到逻辑卷的一般方式在本领域是已知的,这里不再进一步描述。
如本领域已知的那样,系统100的每个主计算机101有一操作系统。在任何单个主机上的操作系统,如Windows NT,都将试图安装它检测到的在主机引导时(例如在主机系统加电或复位期间)被物理连接的所有逻辑存储卷108。结果,在任何一个逻辑卷108上的任何数据都能被该操作系统访问。在新盘存储器(附加逻辑卷)被添加到系统100从而使主机可用它时,或者当一用户试图配置该主机已经可用的存储器时,除非受到限制,否则该操作系统(包括Windows NT4.0操作系统)将自动地向这些新的存储装置写一个标识签名。
这一标识签名通常包括允许该特定操作系统(如Windows NT)唯一地识别该存储装置的信息。除了这些签字的存在本身,这些签字的格式和内容对于本发明是不重要的,它们通常由特定操作系统的供应商(如Windows NT的Microsoft公司)来建立,而且在本领域是已知的。所以这里不再进一步描述这些签名的具体内容和位置。
通常,在存储装置上为该签名保留一个特定的区域,全其实现是针对特定的操作系统和安装的。因此,即使对于有共同操作系统的那些主机,不同的主机安装也可能引起问题。例如,存储器大小、操作系统、操作系统的版本和/或修订版本等,都可能各主机彼此不同。重要的是,一个操作系统可能把重要的数据放在通常由于其他原因而在不同操作系统中或在同一操作系统的不同安装中被保留的区域里。所以,尽管一个区域可能是为Windows NT保留的,可惜问题会出在另一个Windows NT系统将把另一个签名写在这同一区域中。对于给定的主机硬件和操作系统安装,该签名的位置通常是固定的。一般地说,对于签名的写入位置,操作系统供应商进行相当大的控制,但由于所有这些操作系统假定它们单独拥有该存储器,所以没有一种通用的方式来保证数据不被重写。这种情况使该问题与传统作法混合在一起,表明需要一种更通用的解决方案,它不需要靠运气来保持数据完整性。
作为另一个主机系统,例如包含Unix操作系统的系统,可能把数据存储在先前写入Windows NT“签名”的存储位置,其后写入的Unix签名将破坏先前的签名和其他数据。再有,该签名本身可能在其后被正常写操作过程中来自另一个主计算机的数据重写。重写能在任何时候发生,但最可能在格式化或初始化过程中发生。不管在哪种情况,清楚的是存储在物理装置和/或逻辑卷上的信息将被破坏。
所以,存在的问题是在传统的系统100中每个主计算机101有权完全访问全部逻辑卷100,没有任何结构或措施能限制由特定主机或主机组对特定逻辑卷的访问。
所以需要一种结构和方法,通过有效地测试和认证对特定一组主计算机的阵列控制器上的存储卷、逻辑卷或存储装置的访问并把访问只限定于被授权的主机,来解决这一共享访问问题,于是关键性信息和一般性数据都不会被重写或被破坏。
发明内容
本发明提供一种结构和方法,用于在有多个主计算机的计算机系统和网络中控制对共享存储装置(例如盘驱动器存储器阵列)的访问。在一个方面,本发明提供这样一种方法,用于在有多个计算机和至少一个硬件装置与这多个计算机相连的计算机系统中控制对该硬件装置的访问。该方法包含:使局部唯一标识符与这多个计算机中的每一个相关联;在存储器中定义一个数据结构,用于根据局部唯一标识符标识这些计算机中哪一些可得到允许去访问该装置;以及查询该数据结构以确定这些计算机中发请求的一个是否应被允许访问该硬件装置。
在一个实施例中,在存储器中定义数据结构的过程包括:在该存储器中定义一个主计算机ID映射数据结构;在该存储器中定义一个端口映射表数据结构,其中包含多个端口映射表条目;在该存储器中定义一个主机标识符列表数据结构;在该存储器中定义一个卷许可表数据结构;以及在该存储器中定义一个卷号表数据结构。在一个特定实施例中,该存储器是控制硬件装置的存储器控制器的存储器,而该硬件装置是存储器子系统的逻辑卷。
本发明还提供了一个发明的控制器结构,以及实现本发明的方法的计算机程序产品。
附图说明
图1显示一个分布式计算系统的实施例,该系统有多个主计算机通过光纤通道环路和盘阵列控制器与逻辑存储卷阵列相连。
图2显示本发明的主机卷映射结构的实施例,该映射结构包括用于本发明的结构和方法的各种数据结构。
图3是流程图,显示主机卷映射方法的访问控制和验证过程的实施例。
具体实施方式
本发明包括方法、装置、系统和计算机程序产品,用于提供在发明的存储系统控制器(如硬盘驱动器阵列控制器106)上对存储卷的受控制访问。本发明的结构、方法和计算机程序产品,包括控制器106和具有访问控制的存储器子系统108,进一步解决了传统的系统和方法中存在的访问和安全问题,其作法是把对阵列控制器上的或由阵列控制器控制的存储卷108的访问限定于一组特定的主计算机,这组特定的主计算机由唯一标识符(例如全球范围名(WWN)107)标识,该唯一标识符通过主计算机101的网络接口与主计算机101相关连,或者使用其他标识手段,只要该标识手段在这些互连装置中间是唯一的。本发明还提供了对数据的受限安全控制,这里对数据的访问必须受到限制或与该系统的其他用户屏蔽开。再有,本发明的方法以小量查询和开销并以小量性能下降完成这一任务。当一个特定主机有两个或更多个到控制器的接口时,包括例如一个主机有多个主机总线适配器而且每个适配器有一个唯一的ID,则可以根据接口ID去替代或补充主机ID来有利地实现对访问的进一步控制。
本发明的结构和方法对下述场合特别适用:这里一个或多个存储阵列控制器以一个控制器连接到多个主计算机(或具有多个接口的单个计算机),该控制器将请求与存储装置,例如独立盘冗余阵列(RAID)存储装置阵列的数据事务。如已经描述的那样,对于主计算机硬件和主计算机操作系统的同构和异构组合两种情况都存在问题,这里异构是指或者硬件类型不同或者操作系统不同。通常,硬件异构不是一个显著的问题,因为这已通过定义SCSI和光纤通道环路的标准解决了。操作系统的异构更可能造成受破坏的数据。
在一个方面,本发明结构的主机到卷映射(HVM)特性把对任何特别配置的逻辑卷的访问限制为只允许单个主机或主机组。这为存储器阵列提供了数据访问和安全控制,这对于在存储区域网络(SAN)环境中保持数据完整性特别有好处,这里多个主机与一个控制器相连,而且经常是与一个外部控制器相连。存储区域网络(SAN)是指连接到一个存储资源公用池的一个或多个主计算机的集合。“主机到卷映射(HVM)”特性理想地作为软件和/或固件计算机程序产品来实现,该计算机程序产品在控制器106内的处理器或CPU中执行,并利用与该处理器关联的存储器中定义的数据结构来改变控制器的操作。通常,本发明的控制器可以不同于传统的控制器;但是本发明也可用于经适当修改的传统控制器以提供这里描述的特征。例如,本发明的计算机程序产品可以存储在具有光纤通道主机接口和适当的存储器以供定义和存储本发明数据结构的控制器中并在其中执行,例如Mylex公司的DACSF、DACFF和DACFFX控制器以及其他控制器。
某些示例的Mylex公司控制器的控制器设计方面在DACSX/DACSF/DACFL/DACFF OEM系统参考手册固件版5.0-Mylex公司部件号771992-04(Mylex公司,Fremont,California和Boulder,Colorado)中做了描述,这里引入作为参考。SCSI-3基本命令,如由光纤通道连接的那些使用SCSI-3命令的装置所适用的命令,在SCSI-3基本命令,T10/995D修订版(11a-1997年3月28日)中做了描述,这里也引入作为参考。
通过利用本发明的HVM,每个逻辑卷108可被配置成对单个主计算机101(例如只是主机101-2)为可见的,或者对选定的一组主计算机(例如只是主机101-1和101-2)为可见的。参考图1的硬件配置,尽管所有主机101和所有逻辑卷108物理上连接到控制器,但一个简单的HVM配置将允许主计算机101-1只访问逻辑卷108-1,主计算机101-2只访问逻辑卷108-2,而主计算机101-3只访问逻辑卷108-3。
如这里更详细描述的那样,控制器106使用新颖的数据结构和节点名(如世界范围名(WWN))与每个光纤通道环路120装置相关联,包括每个主计算机101中安装的光纤通道主机总线适配器,来唯一地标识已经登录到控制器106中的主计算机。(作为选项,可以向外部配置者(configurator)提供已被允许访问每个逻辑卷的有效主计算机及其相应WWN的列表,以提供图形用户界面来协助配置控制器106和配置HVM。)应该说明的是,节点是一个端口或多个端口的集合,而节点名(Node Name)通常是指与一节点关联的世界范围名(WWN)标识符。端口名是与一端口关联的世界范围名称标识符,例如主机或逻辑卷与控制器106相连的端口。
本发明的HVM结构、方法和计算机程序产品提供了对前面描述的共享访问问题的一个解决方案,其作法是利用一个唯一的主机标识符(主机节点名标识符)与其他结构和过程相结合,以控制对每个逻辑卷上存储器的访问。由于主机节点名标识符的使用对本发明的操作是重要的,还由于世界范围名(WWN)是主机节点名标识符的一种现存的有用类型,特别是对于以光纤通道环路连接的主机和控制器,所以在对HVM进行更详细的描述之前,先简要描述WWN的一些属性。
当把主机101连接到阵列控制器106上的通信通道120是一个遵循“光纤通道物理和信号接口”(PC-PH)修订版4.3,X3T11,1994年6月1日标准,信息系统美国国家标准)的光纤通道环路时,在环路20上的每个装置,包括利用光纤通道主机总线适配器的每个主机101,都有一个唯一的标识符,称作它的世界范围名(WWN)107,这里把“光纤通道物理和信号接口”标准引入作为参考。在本领域,特别是对于光纤通道装置,WWN107是大家都知道的,所以这里只详细描述对理解本发明的结构和操作有用的那些方面。
世界范围名(WWN107)是一个64位标识符(8字节),有60位的值并在前面有4位网络地址权限标识符(NANI)用于唯一地标识装置、节点或端口,包括例如主机总线适配器(HBA),用于将主计算机101与光纤通道通信环路120连接。这个WWN107对每个光纤通道装置是唯一的,通常是以号码(序列号)的形式,该号码是制造商通过作为光纤通道标准规范一部分而规定的过程在适当的标准委员会登记的号码。它对于所制造的每个光纤通道连接装置是唯一的。例如,在每个主机中的光纤通道接口或主机总线适配器(HBA)有唯一的WWN。尽管在这个WWN字符或数字串中有许多字段(field)和子字段,但从本发明的角度看,许多字段和子字段是与本发明没有关系的,为了本发明的目的,WWN可方便地认为是光纤通道装置的唯一序列号。WWN的格式和内容在“光纤通道物理和信号接口(FC-PH)修订版4.3,X3T11,1994年6月1日标准,信息系统美国国家标准(ANSI)”中有详细描述,这里引入作为参考。
WWN107用于唯一地标识与光纤通道环路120相连的每个主计算机101,或者更具体地说,是每个主机总线适配器(HBA),它把光纤通道总线120耦合于主计算机系统的处理器和存储器。这样,如果在单个主计算机101中安装了两个光纤通道HBA,则该主计算机将有两个WWN与其关联,于是有可能不仅识别出通信发自哪一个主机或在响应中应该指向哪一个主机,而且还能识别出是该主机的哪一个HBA。由于WWN是通用的而且是当前存在的,所以本发明的一个方面在于使用WWN以允许访问基于WWN107的存储卷。再有,尽管其他实施例得益于或需要传统控制器中未提供的特殊控制器硬件,但至少是本发明的一些实施例可以在现有硬件中实现。
应该指出,我们主要是针对光纤通道环路120和与这种光纤通道环路相关联的WWN107来描述本发明的,但本发明不限于这种光纤通道环路或WWN作为仅有的主机节点标识符,而是能用于采取其他通信通道策略和协议和/或不同的主机节点标识符,例如并行SCSI通道和SCSI ID,尽管这将不代表一种优选配置,这是由于SCSI地址数有限(15)而且这些SCSI装置之间的物理距离有限(通常约6米),而这些限制中的任何一个在光纤通道通信中都不存在。例如,对于在因特网或万维网上互连的计算机和存储器,可以预见有各种计算节点标识符。
参考图2,我们现在描述本发明的主机卷映射(HVM)结构和方法的一个实施例,它所处系统的配置是有多个主计算机101-1、101-2…、101M连接到一个或多个外部存储装置阵列控制器(下文中的“控制器”106),还有多个硬磁盘驱动器配置成与控制器耦合的多个逻辑卷108;这是经常用于实现存储区域网络(SAN)配置的一种配置。主计算机101通过光纤通道判优环路120和/或一个交换机(已知多种类型)连接到控制器106。逻辑卷108与控制器106的耦合可以使用光纤通道判优环路(FibreChannel Arbitrated Loop)122,或者在足以支持单元数和电缆距离限制的情况下可以通过并行SCSI链。如在本领域已知的那样,逻辑卷108可被配置为RAID或其他存储器子系统。
再有,尽管这里具体描述的是磁盘驱动器,但容易理解,可以使用其他形式的数据和信息存储器,例如(但不限于)硬磁盘驱动器、磁光驱动器、光驱动器、CD-ROM、DVD、光盘、可卸下介质如lomega ZIP盘和lomega JAZ盘、带驱动器、固态存储器装置以及其他数据和信息存储装置。最后,HVM结构和方法可以应用于希望由另一个装置来控制对一个装置的访问的任何场合,因此,尽管我们描述的是由每个主计算机控制对逻辑存储卷108的访问以保持数据完整性,但本发明的方法可以容易地应用于为了任何其他理由而控制对任何其他计算机外围装置的访问。例如,可能限制特定的计算机访问彩色打印机和CD-ROM记录装置,其中尚未对使用这些较昂贵的计算机外围设备付款,或者由于安全的理由,这里只举出少数几个可能希望控制访问的场合。
我们现在参考图2中的计算机系统201来描述本发明的访问控制和验证过程(ACVP)300的一个实施例。图2a显示控制器106以及它与主计算机101和逻辑卷108的关系,还包括控制器的NVRAM182中定义的数据结构的顶级图示。图2b显示数据结构的补充细节。这里使用的短语“数据事务(data transaction)”是指主机101和阵列控制器106之间的信息传送,包括像从阵列控制器106读数据和向其写数据这些典型操作。当主计算机101在光纤通道总线120上发出一个数据传送命令(通常为读或写请求)时,一次数据事务便开始了,或者说主计算机101发起了一次数据事务。
在存储器阵列中的每个逻辑卷被赋予或者说被关联于一个卷数据结构140,该结构的一个元素是卷WWN表(VNT)130。这些VNT表(130-1,130-2,…,130-N)可以认为是一些单独的小表或单个较大的表,但在任何情况下,它们都提供了在其后的搜索或查询操作中使用的VNT数据结构。(下文中我们将扩展卷数据结构概念的描述,以包括卷许可表160。)例如,逻辑卷108-1与VNT130-1相关联,逻辑卷108-2与VNT130-2相关联,而逻辑卷108-N与VNT130-N相关联。这一个或这些个VNT表作为存在在控制器106的非易失存储器(NVRAM)182中的控制器106配置数据的一部分被存储起来,而且希望的是存储在与那个控制器106关联的盘(逻辑卷)上。这一配置通常称作“盘上配置(COD)”,可由供应商独特直接命令访问(读和写),这些命令允许存储卷阵列108被初始配置和/或在必要时重新配置。这些供应商独特命令将在本说明中其他地方描述。
每个卷WWN表130在任何给定时刻有有限数量的条目,每个被允许访问与其相关联的逻辑卷108的WWN有一个条目。但是,尽管在任何一个卷WWN表130中条目的大小或个数在任何给定时刻是限定的,这限定的个数对应于被允许访问该卷的光纤通道装置(主机或HBA)的个数,但卷WWN表的大小是不固定的,它能在必要时扩展到任何大小,从而包含所需要的光纤通道装置条目数,只是在实践的意义上受限于为存储这些条目所能得到的存储器。在一个实施例中,如果与逻辑卷关联的VNT中全部条目为零,则该零值用于表明所有主机可以有对那个特定逻辑卷的访问。
在一个数据事务的开始,如果一个主计算机101希望访问由控制器106控制的逻辑卷108,那它必须登录或者标识它的访问请求。主机101首先经由控制器106登录到逻辑卷存储器阵列108,然后提出访问特定逻辑卷的请求。这一登录的各方面是光纤通道判优环路协议的一个传统部分,这里不予详述。(参见光纤通道判优环路协议标准和光纤通道物理和信号接口,这里被引入作为参考。)作为这一登录事务的一部分,告知阵列控制器106一个主机101正在试图与逻辑卷108连接,并以命令包109的形式发送与发请求的主机101(或与主机101关联的HBA103)对应的唯一WWN107以及环路ID152。
随着登录过程的继续,控制器106根据所收到的环路ID152识别那个主机的主机索引(HI)151。在一个实施例中,主机索引151是由控制器根据主机试图登录到光纤通道端口的顺序依次产生的。第一个试图登录的主机将被赋予HI=0,第二个主机将被赋予HI=1,依此类推。另一种情况是可以实现其他主计算机HI赋值规则。如下文中更详细描述的那样,主机索引151的作用或操作是作为一个指针以允许简化的对存储在主机WWN列表153中的信息的访问和间接进入卷WWN表(VNT)130和卷许可表(VPT)194。在一个实施例中,主机索引含有4位,于是至少16个不同的主机能被唯一地标识,而其他实施例提供更多位从而允许有更多的主机被唯一地标识。
需要指出的是,在这一试图登录之前,先前已登录到控制器106的主计算机101的WWN107第一列表被存储于定义在控制器106的存储器(NVRAM)182中的主机WWN列表153数据结构中,并由主机索引151编排了索引。例如,在图2中,主机WWN列表153包括被编索引的存储器用于线性列表中的可多达256(编号0-255)个主机WWN107条目。在该列表中的WWN条目(例如与HI=0对应的条目显示为十六进制的“20.00.00.E0.8B.00.00.07”)是示例性的,不一定与所制造的装置相关联的过去、现在或将来的实际WWN有任何关系。在主机WWM列表153中的空存储位置用“FF.FF.FF.FF.FF.FF.FF.FF”指示。
也定义在控制器106的存储器(NVRAM)182中的第二个数据结构,或者说存储主机索引列表151的主机ID映射列表155数据结构由光纤通道环路ID152编排索引。这个主机ID映射列表155把每个环路ID152映射到主机索引151,如图2b中所示。在一个实施例中,在连续存储器存储位置中的环路ID152是连续数(指针),而主机索引151值是不连续的,是由二字节的16进制值表示的。
主机ID映射列表155由主机环路ID152指针查询。在图2b中描绘的例子中,与一特定的收到命令109关联的主机环路ID152是值“23”,所以用作进入主机ID映射表155的指针或索引,以选择主机ID映射155的条目环路ID号23(实际上是从零条目开始的第24个条目)。主机ID映射155条目号23含有主机索引“01 h”,它又用作进入主机WWN列表153的指针或索引,以选择与那个主机索引相关联的WWN107,在这一情况中,第二条目从位置零开始,这里WWN是“20.00.08.00.09.00.34.12”。
在图2的实施例中,控制器106对全部主机端口114、184只保持一个主机WWN列表153;而且即使对于多个控制器106的情况,这一结构和过程允许对光纤通道连接拓外做最简单的表达,即不管主机与哪个端口或控制器通信,该特定主计算机的主机索引(HI)151都保持不变。
一旦在主计算机登录阵列控制器106时建立了主机WWN列表153和主机ID映射列表155,并作为这些登录的结果由阵列控制器产生卷WWN表130,这一过程便能对试图登录的主机认可或者拒绝访问。
我们现在描述一个示例性的LUN到逻辑卷映射(卷映射)结构和过程。 “卷映射”(VM)是一个过程,这里控制器106把特定的光纤通道(由接收该命令的I/O处理器标识)、光纤通道环路ID以及SCSI LUN映射到一特定的逻辑卷。SCSI LUN是到逻辑存储卷的一个路径。“主机到卷映射(HVM)”允许特定的主机(由光纤通道、光纤通道环路ID以及SCSI LUN标识)到逻辑卷,从而扩展了卷映射(VM)的概念、方法和结构。所以,HVM允许对卷的主机访问控制,而VM不允许。根据光纤通道约定,基于硬件、软件或协商过的设置来赋予主计算机环路ID,但也可以与本发明的结构和方法结合使用其他赋值规则。
卷映射特性为控制器106、端口114、光纤通道I/O处理器184以及逻辑卷108组合维持一个端口映射表190形式的卷映射表。这允许指定的逻辑卷作为不同的LUN出现在每个主机端口114上。可能有多个主机端口114而且对每个端口可能有多个光纤通道I/O处理器184,而每个主机端口与特定的控制器106关联。借助光纤通道环路特性或SCSI协议和/或规范,通常可能有多个主计算机连接于一个或一些控制器主机端口。允许特定逻辑卷作为不同的LUN出现在每个主机端口是有好处的,因为它在允许主机访问该逻辑卷方面可以有大的灵活性,而且对于下文要更详细描述的HVM环境,这一特性特别有好处,因为所允许的灵活性允许存储卷映射到有异构操作系统的主计算机的异构集合。这些系统的每一个将对映射存储器有特定的要求,而接纳这些不同的存储器映射要求则有利地依赖于以多种不同的方式映射存储器的能力。
卷映射的思想是把连到阵列控制器的物理盘驱动器的存储容量分割成一些“逻辑卷”,然后,通过对每个逻辑卷赋予一个访问路径并进行检验以确认试图使用的访问路径有效,以此来控制主计算机对这些逻辑卷的访问。通常,该访问路径包含主机到控制器端口114(即哪个主机I/O处理器184),主机处理器184的SCSI ID(或光纤环路ID),以及读或写命令的SCSI LUN号。
在端口映射表190内含有的端口映射表条目191有利地作为图2b中所示每个控制器106、每个主机通道184以及每个逻辑卷108的例子,规定了每个主机端口114和主机端口I/O控制器184如何通过阵列控制器106与每个逻辑卷108相连。端口映射表190含有多个端口映射表条目191,每个控制器106、主机I/O处理器184以及逻辑卷108的组合有一个条目。每个端口映射表条目191包括含有这一端口上逻辑卷的环路ID的一个8位(1字节)目标ID192、含有该命令所指的这一端口上的逻辑卷的LUN号(也称作目标环路ID)的一个8位(1字节)LUN193、一个32位卷许可表194、以及存储各种标志指示符的标志位195字段(8位)。
标志位有特殊的功能,如果“有效”标志(位6)被清除,则所有主机被允许访问该逻辑卷。如果“有效”标志(位6)被置为“1”而且卷许可表还是全零,则任何主机都将不能访问该逻辑卷。
卷许可表194是一位标志队列,它从位位置0到位位置255。根据支持的装置数,可提供多些或少些位数。如果这些位中有一位不为零,则逻辑卷108可以被具有该WWN的主机访问,该WWN是在卷WWN表130中相应的主机索引位置处找到的。例如,如果卷许可表中的位置5被置为1(“1”),则检验卷WWN表130的位置5(HI=5),并读取或查询在那个位置包含的WWN。具有这个WWN的主机将被允许访问这一逻辑卷。
端口映射表条目191有利地作为例子,用于说明单控制器情况中的控制器101或多控制器(例如双工控制器)配置下的每个控制器、每个主机通道以及每个逻辑卷的情况。这意味着存在一个端口映射表190,它定义每个主机端口(控制器106中的主计算机光纤通道I/O处理器184)如何与每个逻辑卷相连。
一旦配置了逻辑卷108,控制器106便在其处理器存储器中为每个逻辑卷维护一个卷许可表194,它含有被允许访问该逻辑卷的主机的WWN列表。这个表根据WWN标识主计算机101中哪些被允许访问与该控制器连接的每个特定逻辑卷。一个控制器106通常可能有多个主机端口114和盘驱动器端口115,以及相应的在每个端口的I/O处理器184、185。I/O处理器,例如主机I/O处理器、光纤通道I/O处理器184、185,可以是相同类型的,但它们被分类为主机端口184(用于与主计算机通信)或盘端口185(用于与盘通信)。
在本发明的一个实施例中,一种智能SCSI处理器(ISP)芯片用于光纤通道I/O处理器184、185。ISP处理器芯片由Q-Logic公司制造,可由Q-Logic公司(3545 Harbor Blvd,Costa Mesa,CA 92626)得到。在“ISP产品家族”中,Q-Logic公司制造多种ISP芯片。
控制器106使用由主机请求的LUN号和收到命令的主机到控制器端口114、115(或184、185)的标识,这二者都是由ISP以命令产生的,来确定该主机正在试图访问哪个逻辑卷。光纤通道协议芯片(如ISP)的操作在本领域是公知的,这里不再进一步详细描述。
控制器106使用卷WWN表130确定被允许的和不被允许的任何特定主计算机对一特定逻辑卷的访问。如果一个主计算机101向控制器106发送一个新命令。该控制器在服务这个主机命令之前,先要针对表130中的数据来验证WWN、控制器端口以及LUN。如果对于该逻辑卷该WWN、LUN和主机到控制器端口信息是有效的,则由主机请求的命令被正常地完成。但是,如果该WWN、LUN和主机到控制器端口组合对该逻辑卷是无效的,则所请求的命令不被正常地完成,于是返回一个状态,指出该特定逻辑卷不被支持。(但是,发生三个例外,这在下文中描述。)在本发明的一个特定实施例中,作为固件301实现的程序代码使得不能被确认有效的那个命令以“检查条件”这一状态完成,同时感知关键字设为”非法请求(05h)和感知代码设为“逻辑单元不被支持(25h)”。
我们现在把这一描述聚焦到本发明的主机卷映射(HVM)结构和方法的一个实施例。在这方面,图2b中显示了控制器106、主机101以及逻辑卷108上存在的各种数据结构、列表、位映射等以及它们彼此之间的关系。每个与主计算机101耦合的光纤通道环路120存在一个WWN107,这提供了一个机会可以利用本发明方法中的WWN来为每个逻辑卷108建立被允许的WWN的分离表,即卷WWN表130。只有当要从特定逻辑卷108请求数据的特定主计算机的WWN被包含在与该特定逻辑卷108相关联的卷WWN表130中的时候,盘阵列控制器106才允许对每个特定逻辑卷108的访问。该WWN必须存在于该表中,如果它存在,而且该主机已登录到该阵列上,那么只需再检查卷许可表来验证访问。对于有N个逻辑卷的阵列,在系统中提供N个卷WWN表130(130-1、130-2、130-3、…、130-N)。如果所有卷可以由同一组主计算机访问,则这N个卷WWN表中每个将含有相同的主机WWN列表;然而,当不同的卷可由不同的主机访问时,逻辑卷的N个卷WWN表的内容通常是不同的。
在这一点,阵列控制器106搜索与每个逻辑卷关联的所有卷WWN表130(即表130-1、130-2、…、130-N),以确定发请求的主机被允许访问哪个(如果有的话)逻辑卷。当一个主机的世界范围名出现在与一个逻辑卷关联的卷WWN表130中时,该主机将被允许访问那个逻辑卷,而当那个主机的世界范围名没有出现在那个表中时,该主机将不被允许访问那个逻辑卷。该阵列控制器这样控制访问。
卷许可表194是在搜索进行过程中产生的,并作为端口映射表130的一部分被保持。卷许可表194包括许可指示符195,它指出是否允许具有HI的特定主机访问该逻辑卷上的数据。这些VPT194也显示在图2b中,并且标识哪些主机(根据主机索引151)被允许访问和哪些主机不能允许访问。
在进行卷WWN表130搜索时,将根据搜索结果把特定主机(由主机HI标识)的卷许可表194条目或者设为“真”(等于1)或者设为“假”(等于0)。例如,如果卷WWN表130搜索表明一个主机应被允许访问一个特定逻辑卷(当那个主机的WWN出现在与那个卷关联的卷WWN表130中的时候),则对那个主机(由其HI标识)的卷许可表194条目(允许标志195)将设置为“真”或“1”,表明该主机可以对那个逻辑卷进行访问,反之,如果查询表明该主机的WWN没有出现,则那个主机(由其HI标识)的卷许可表194条目(允许标识195)将设置为“假”或“0”。
当主计算机101试图读或写逻辑卷108时,由控制器108确定这个发请求主机的HI151,其根据是由光纤通道I/O处理器184返回的那个主机的光纤通道环路ID152以及完全定义该操作的详细信息,包括该读或写请求寻址的LUN。如果该请求不是一个供应商独特命令(它可能指明试图配置或重新配置一个卷并需要特殊的处置),则阵列控制器106检验对于那个HI和对那个逻辑卷的卷许可表194。如果与那个HI关联的许可指示符是真(“1”),则该请求被正常执行。就是说,使用对逻辑卷读或写的正常过程来执行该读、写或其他访问请求。反之,如果与那个HI关联的和该请求针对的那个逻辑卷的许可指示符是假(“0”),则该读和写命令被拒绝,并以错误条件回送到发出该命令的主计算机。
当请求为“查询”命令或“供应商独特”命令或“报告LUN”命令时,存在特殊的条件。这些命令通常与确定该系统的配置或特征相关联,或者与该系统或其部件(例如控制器106)的配置或重配置相关联。在本说明书的其他地方更详细地描述这些特殊命令的各方面。对于查询、供应商独特以及报告LUN类命令之外的其他命令,如果由一主机对一逻辑卷提出请求,而该逻辑卷没有对那个主机的许可,则阵列控制器将声明一个错误件条并拒绝访问。
如果该主机有许可,而且该命令既不是查询命令,也不是供应商独特命令,也不是报告LUN命令,则该命令被正常地处理。正常处理一个读命令意味着一旦接收了一个读命令,阵列控制器将从附属的一个或一些盘驱动器(逻辑卷)读取数据,并把这些数据返回给该主机。一旦收到写命令则阵列控制器把主机发送的数据存储到附属的一个或一些盘驱动器中。除了这些程序上的步骤外,控制器106还应该确认该逻辑卷是被映射到接收命令的控制器端口。由于能有多个主机到控制器端口114、184;而且一个逻辑卷能被映射到任何单个端口或任何选定的多个端口,或者不映射到任何端口;所以控制器106应该保证该逻辑卷能通过接收该命令的特定主机到控制器端口被访问。该控制器还应确认该逻辑卷被映射到该命令的逻辑单元号(LUN)。由于每个端口能有许多逻辑单元,如在SCSI和光纤通道规范中定义的那样,这允许一个端口去访问许多装置。最后,该控制器应确认对这一逻辑卷该WWN是有效的,这些已经描述过了。
这些过程允许主机101在允许访问时读和写数据,去识别在该陈列和该计算机系统100中存在逻辑卷108并被映射到那个逻辑单元号(LUN),但是,当不允许访问时,在该逻辑卷上的数据不允许被访问和可能被改变。向主机系统提供识别逻辑卷的存在和被映射到特定逻辑单元号的能力是符合希望的,因为遵从SCSI标准是所希望的,而且SCSI协议需要允许任何主计算机确定哪个存储器是可用的以及那个存储器的参数(大小、传送能力等)是什么。
陈列控制器106的配置经常是存储在盘上的特殊保留区上,这称作“盘配置”(COD)。这允许在替换阵列控制器时更有效地进行阵列控制器106的配置(例如在一个控制器失效之后)。该替换控制器从盘中检索原来的配置自动恢复它,而不必在单独的费时的重新配置过程中去弄清楚配置信息。当盘配置(COD)空间有限时,被连接主机的最多个数也被限制,例如限制为某一主机数,例如16个主机。在COD不受限制的其他实施例中,被连接主机最多个数参数可以设为256个条目,从而允许有足够多的条目用于根据光纤通道规范全填满的环路。
除了卷WWN表130,在阵列控制器106中的固件还使用主机ID映射155把主计算机光纤通道环路ID152转换成正确的卷WWN表130条目。这允许主机101改变它们的特定光纤通道环路ID152而不影响卷WWN表130。对阵列控制器106上的每个光纤通道端口维持一个主机ID映射155。能容纳的光纤通道主机节点(WWN)名的最多个数设为256,以允许在0至255范围内的任何环路ID。
首先以含有HVM特性的固件引导控制器106,接着使光纤通道复位的第一环路初始化基元,在控制器106中执行的固件从环路120上的所有主机101检索登陆信息。该固件由这些登陆信息构建卷WWN表130以及主机ID映射表155。一前一后的这两个表向固件提供了把来自光纤协议芯片(例如ISP芯片)的嵌在一个新命令中的环路ID152正确地翻译成主机索引151的能力,而该主机索引151又以特定的WWN107来标识主机101。事实上,环路ID152是这样被映射到主机WWN107的:(1)首先把环路ID152映射到主机索引151,(2)然后把主机索引151映射到主机WWN107。这一方法是有利的,因为只需要小量的(最小量的)查询和比较以确定是否应允许一个特定主机访问一个逻辑卷。
我们针对图了(图3a和图3b)的流程图着重说明本发明过程的一个实施例300,它以确定是否已有一主机试图登陆开始(步骤302)。当检测到一个主机试图登陆时(步骤302),控制器106在主机WWN列表153中搜索试图登陆的主机的WWN107。如果找到了试图登陆的控制器的WWN(步骤306),则该主机的WWN107在主机WWN列表153中的位置便是主机索引151。如果没找到该WWN,试图登陆的主机的WWN107被加到主机的WWN列表153(步骤307)的末尾并且该位置是主机索引151。然后,该主机索引151被放入主机ID映射155,放在由主机光纤通道环路ID152指出的位置(步骤308)。然后控制器106从光纤通道I/O处理184收集下列信息:控制器(步骤309)、产生该请求的I/O处理器(步骤310)以及该命令指向的目标的逻辑卷(步骤311)。(收集这些信息的过程对实现光纤通道I/O处理器184的特定硬件而言通常是独特的,所以这是不予以详细描述。这些信息允许控制器106去识别正确的端口映射表191(步骤312),它含有那个逻辑卷108的卷许可表194。然后控制器106搜索与那个LUN关联的卷名表136以确定那个试图登陆的主机是否被允许访问那个逻辑卷108(步骤313)。如果在卷名表130中找到了对那个逻辑卷108匹配的主机WWN107,则该控制器106把由主机索引151指向的卷许可表194条目设为“真”或“1”(步骤315)。如果对那个逻辑卷108未发现匹配的WWN,则控制器106把由HI指向的卷许可表194条目设为“假”或“0”(步骤314)。
控制器106等待要接收的主机访问请求(例如一个命令)。当收到一个主机访问请求(例如一个读或写命令,或者一个查询或供应商独特命令时),控制器106确定该命令的类型(步骤302)。一旦收到一个命令,控制器106使确定该命令的类型是一个I/O命令(如读命令或写命令)还是一个供应商独特命令或查询命令(步骤303)。
如果该请求是一个I/O命令(例如读命令、写命令或查询命令),则控制器106确定收到该命令的控制器的标识(步骤317)、该命令的主机端口(步骤318)以及该命令寻址的LUN和相应的逻辑卷(步骤319)。根据控制器、主机端口I/O处理器以及逻辑卷,定位适当的端口映射表(步骤320);并根据该命令的目标ID识别出主机ID映射中的主机索引(步骤321)。然后控制器106检验卷许可表194中由该命令的主机索引的指示的位置,以确定该位置存储的是“1”位(真)还是“0”位(假)(步骤322)。如果该许可指示符是真,则对该逻辑卷的访问被允许,并且控制器106正常地处理该命令(步骤325)。然后该过程完成并返回(步骤326)。如果该值是假,则对该逻辑卷的访问不被允许,控制器106以一错误条件指出对那个逻辑卷无可用的存储空间,于是过程完成并返回(步骤326)。如果该请求不是一个I/O命令,而是一个查询命令或供应商独特命令,则响应取决于命令类型。如果该请求是一个供应商独特命令,则控制器106正常处理该命令返回(步骤304)。
如已经描述的那样,主机到卷映射(HVM)是已描述的阵列控制器的卷映射(VM)能力的增强和扩展,它保持基于每个逻辑卷的端口映射数据结构。“基于每个逻辑卷”是指对每个逻辑卷说明端口映射数据结构。在HVM增强中,我们提供主机的WWN作为进一步访问路径限制符。
本发明的过程300可以有利地作为计算机程序产品301实现,定义和存储在控制器106的存储器中,通常是NVRAM182,并可选地存储在主机存储器中或者存储在其他存储介质上并可下载到该控制器。程序产品301,或者它的可执行部分,从存储器182移到与控制器106地处理器180关联地RAM181,并由控制器内地处理器180执行。处理器存储器181-182是指RAM、ROM、NVRAM及它们的组织。在主计算机101和逻辑卷或盘驱动器108之间发送的数据在数据高速缓存存储器186中暂存,该数据高速缓存存储器186通过PCI总线接口和存储器控制器183访问,当然也可使用其它接口。光纤通道I/O处理器184(184-1、184-2、184-3、……、185-N)发送和接收来自逻辑卷或驱动器101的数据,并把该数据暂存在数据高速缓存存储器186中。处理器180协调所有I/O处理器184-185的活动,并处置包括读和写任务在内的各任务的调度以及错误处理。
本发明的方法至少是部分地减小了所需搜索的次数,因为在登陆时创建(或更新)了有效组织和构成的卷数据节后142,包括与每个逻辑卷关联的卷许可表194。在这里描述的本发明实施例中,在能确认访问权限和能安排读或写操作时间之前,只需要检验一个字节(1位)。没有卷许可表194时本发明可能提供这一功能的效率不那么高的一种实现,于是对所收到的每个读和写命令需要单独地查询卷WWN表130的每个条目需要搜索和比较多达16个条目,每个条目为8字节。在完成这些比较之前没有数据传送,而且会加以显著的限制和增加响应时间,并且减小了整个系统的吞吐能力。在本发明的最佳实施例中,只需在登陆时进行一次搜索,在其后试用卷许可表194便能很简单地确定访问权限。
上述实施例提供了若干有利特性和能力。这些包括:(1)一个逻辑卷映射到只在一个指定主机端口上的单一LUN;(2)一个逻辑卷映射到卷许可表(或主机索引位图)中被允许访问该逻辑装置的所有主机的相同LUN;(3)一个逻辑卷可以映射到不同控制器或不同主机端口上的不同LUN;以及(4)多个逻辑卷可以映射到单个主机端口上的LUNO(或任何其他LUN),如果这些逻辑装置的卷许可表(或主机索引位图)没有重叠的话。
我们现在回来描述某些供应商独特命令,从而能更容易地理解在初始时配置该系统以容纳HVM和在希望改变或更新时重新配置该系统的方式。供应商独特命令允许系统100被配置,而且通常是独立于逻辑卷的。这样,作为系统100一部分而尚未被配置的阵列控制器106能被配置或重新配置从而与系统100中主机101的唯一WWN107正确地操作。配置控制器,从而针对逻辑卷108和主机101的独特存储要求进行正确的操作,这涉及构建一个配置数据结构,以及把该数据结构通过一个供应商独特命令传送给陈列控制器。
我们简要地描述这些逻辑卷配置步骤。首先,主计算机(与控制器106连接的主计算机101的任何一个)的一个用户在该主机的内部存储器中构建配置数据结构。(这一过程还可以根据从其他信息源收集或可得到的信息自动进行)。接下来,主计算机通过一供应商独特命令的写配置变量把该配置数据结构传送给陈列控制器106。控制器106响应该供应商独特命令,通过向主机返回一个“好SCSI”状态来确认已成功接收了该命令。第四,在完成这一写配置供应商独特命令之后,阵列控制器把配置数据写到与该控制器相连的所有盘(逻辑卷)。第五,该主机向阵列控制器发出复位控制器供应商独特命令,它使控制器复位和重启动。最后,在完成重启动之后,控制器106按照该配置结构中的数据所指定的那样被配置。
在前文的描述中还指出,与读或写命令相比,当所请求的访问是“查询”命令或“供应商独特命令”或“报告LUN”命令时存在的特殊条件查询命令是这样一个命令,它允许主计算机确定对一特定SCSI逻辑单元是否存在可得到的数据存储空间,并允许主机确定那个SCSI逻辑单元的传输特征。它返回指定的信息,详细说明SCSI、LUN的存储容量、该LUN的传输能力、序列号以及其他信息。供应商独特命令是这样一个命令,它允许确定和设置该阵列控制器的独特特征(例如,没有在SCSI或光纤通道规范中定义的因而可能通过标准的SCSI或光纤通道命令或协议得不到的那些特征,以及允许对存储阵列108的其它特殊操作。该阵列处理允许未被配置的控制器被重新配置,从而针对所连接的主机正确地操作。供应商独特类命令的实例包括设置配置命令和读配置命令,用于读和设置阵列控制器的配置,以及通过操作命令,它允许主机直接访问连到控制器上的盘装置。这些命令在本领域是公知的,除了必需描述与本发明有关的特殊处理外,这里将不再更详细地描述。
如果该请求是一个查询命令,陈列控制器106将返回传统的查询数据,并将指出那个主机是否有对该逻辑单元(从而对该逻辑卷)的访问。如果该主机没有对该逻辑卷的访问,则控制器将返回查询数据和外围限制符,该外围限制符作为指示符以指明该阵列能支持这个SCSI逻辑单元上的一个装置,但当前没有任何装置连到这个SCSI逻辑单元。
以这种方式处置查询命令,部分原因是SCSI规范声明一个SCSI LUN总是应该返回查询数据。查询数据是关于SCSI装置的状态数据,而且与那个装置上存储的数据没有任何关系。该命令和该主机的一个结果是确定该装置是否有任何存储器,以及确定该装置的能力如何,例如它传送数据有多快。SCSI协议在光纤通道层的顶上运行,所以这一描述适用于本发明的并行SCSI和光纤通道两种实现。在不需要遵从SCSI规范的地方,可以代之以其他过程。
最后,如果该请求是一个“报告LUN”命令,而且被寻址的LUN是0(SCSI规范要求LUN=0),则控制器正常地完成该命令,只报告可由请求该命令的主机访问的那些LUN。报告LUN命令返回的信息详细说明在那个光纤通道上和在那个SCSI地址的主机能得到哪些SCSI逻辑单元。
对于查询、供应商独特和报告LUN类命令以外的其他命令,如果由一主机产生一个对一逻辑卷的请求,而该逻辑卷没有用于那个主机的许可,则阵列控制器将声明一个错误条件并拒绝访问。例如,可以为那个命令设置一个SCSI检查条件状态,返回SCSI数据,并使感知关键词设为“非法命令”,把附加感知代码设为“逻辑单元不被支持”,由此来声明错误条件检查条件、非法命令、感知数据、感知关键词、附加感知代码、外围限制符和逻辑单元不被支持都是SCSI标准术语,这里不再进一步描述。
除了这些命令,主机到卷映射(HVM)有利地使用了若干特定的供应商独特直接命令。这里把这些命令称作主机到卷映射(HVM)直接命令。一个直接命令是一个SCSI供应商独特命令,它允许由阵列控制器发送和接收配置数据。这些主机到卷映射(HVM)直接命令包括:读LUN映射、写LUN映射和读卷WWN表。
读LUN映射命令向主机返回由阵列控制器106维护的卷映射信息。主机需要来自控制器的卷映射信息,以向用户显示该逻辑卷阵列的当前配置。该映射信息存储在该控制器配置数据中定义的逻辑卷端口映射表数据结构中。这些数据存储在阵列控制器106的非易失存储器中,而且最好是还存储在盘驱动器的特殊保留区(COD)中。
在本发明的一个实施例中,使用控制器固件中的供应商独特直接命令操作码(20h)发送读LUN映射命令。表1中列出一个命令格式示例。
表1.读LUN映射供应商独特直接命令CDB格式示例
字节/位 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 操作码(20h) | |||||||
1 | LUN | 保留 | ||||||
2 | DCMP操作码-MDACIOCTL_READLUNMAP(D1h) | |||||||
3 | 逻辑卷号(MSB) | |||||||
4 | 逻辑卷号(LSB) | |||||||
5 | 保留 | |||||||
6 | 保留 | |||||||
7 | 分配长度(MSB) | |||||||
8 | 分配长度(LSB) | |||||||
9 | 控制字节 |
在这个命令数据块(CDB)格式示例中,LUN字段含有该CDB的逻辑单元号,并被忽略。直接命令操作码(DCMP OP CODE)是要执行的命令,而MDACIOCTL_READLUNMAP(D1h)是读LUN映射命令的具体命令值。逻辑卷号(最大有效位-MSB和最小有效位-LSB)指定要报告其信息的逻辑卷的装置号。分配长度(MSB和LSB)指出启动者(initiator)为返回信息分配的字节数。如果该长度为零,则无数据被传送,这不作为错误条件处理。当控制器已完成所请求字节数的传输,或少于该字节数的全部返回卷映射信息时该控制器终止数据传送阶段。所有保留子段和控制字节(这里它被忽略)应为0。
读LUN映射命令的错误条件包括对一错误的标准SCSI响应,包括指定一个无效逻辑卷号。控制器还将响应SCSI检查条件状态,如在命令中指定一个不存在的逻辑卷时将会发生的那样
写LUN映射供应商独特直接命令允许一个启动者(如一个主计算机)创建或改变由控制器使用的主机到卷映射(HVM)信息。当控制器被初始配置时创建主机到卷映射(HVM)信息,而当增加或删除逻辑卷时,或者当增加或去掉主计算机时,则改变主机到卷映射(HVM)信息。这已数据格式反映端口映射表数据结构。写LUN映射直接命令CDB格式示例于表II。
表II.写LUN映射直接命令CDB格式示例
字节/位 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 操作码(21h) | |||||||
1 | LUN | 保留 | ||||||
2 | DCMD操作码-MDACIOCTL_WRITELUNMAP(D2h) | |||||||
3 | 逻辑卷号(MSB) | |||||||
4 | 逻辑卷号(LSB) | |||||||
5 | 保留 | |||||||
6 | 保留 | |||||||
7 | 分配长度(MSB) | |||||||
8 | 分配长度(LSB) | |||||||
9 | 控制字节 |
写LUN映射的操作码(DCMD OP CODE)字段值(MDACIOCTL_WRITELUNMAP)(D2h)指定该直接命令为写LUN映射。逻辑卷号指定要报告其信息的逻辑装置的装置号。分配长度指出启动者要向控制器发送的字节数。如果该长度为零,则无数据传送,这不作为错误条件处理。所有保留字段和控制字节必须为0。写LUN映射的错误条件包括对一错误的标准SCSI响应,包括指定一个无效的或不存在的逻辑卷号。
读卷WWN表命令返回由控制器维护的卷WWN表。由这一命令返回的数据提供了从主机物理WWN到主机索引的转换,该主机索引由控制器内部使用和由读/写LUN映射命令使用。当主计算机构建在写LUN映射命令过程中发送的配置信息时,这一信息是必须的。读卷WWN表供应商独特直接命令的CDB示例示于表III。
表III.读卷WWN表供应商独特直接命令的CDB示例
字节/位 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 操作码(22h) | |||||||
1 | LUN | 保留 | ||||||
2 | DCMD操作码-READ_HOST_WWN_TABLE | |||||||
3 | 保留 | |||||||
4 | 保留 | |||||||
5 | 保留 | |||||||
6 | 保留 | |||||||
7 | 分配长度(MSB) | |||||||
8 | 分配长度(LSB) | |||||||
9 | 控制字节 |
标签为操作代码字段(DCMD OP CODE)的读主机WWN字段(READ_HOST_WWN_TABLE)指定该直接命令为读主机WWN表。这一命令可被修改成对每个被支持的主机返回希望字节数的数据。返回字节数通常由该特定主计算机确定。它应该准备好接收控制器发送的数据,所以它应有足够的可用空间存储该数据。这通常会因计算机而异。例如,在本发明的一个实施例中,该命令为每个主机返回12个字节数据,而在本发明的另一实施例中该命令为每个被支持的主机返回192个字节数据,而在本发明的又一个实施例中,在其中实现该命令的固件对每个被支持的主机返回3072个字节数据。
外部配置程序,如GAM(全局阵列管理器)或RAIDfx能使用来自读卷WN表命令的数据,以确定关于该光纤主机电缆连接拓扑结构的一些有限信息。在HVM中赋值可用的主机应以它们各自的WWN显示出来用于光纤通道拓扑结构。主机索引的概念通常对于最终用户是隐藏的,因为主机索引的赋值时任意的,其主机索引与物理主机没有固定的关系。一旦赋予了主机索引,它们将保持固定,直至该配置被清除。还可以可选向用户提供主机电缆和连接拓扑结构的简单图形表示,以协助最终用户适当地决定一个可行的主机到卷映射(HVM)策略。可以向外部配置程序提供一个用于通过网络上其它主机连接的存储器的探测器(probe),使配置程序能把所连接的主机的实际网络名与它们各自的WWN关联起来。还可以可选地为遗留系统和先于HVM实现的配置提供翻译和变换过程。
我们现在描述在HVM环境中的SCSI命令支持以及在标准SCSI命令环境中使用主机到卷映射(HVM)时在本发明的一个实施例中控制器响应命令的示例。主机到卷映射(HVM)特性根据请求命令的主机的标识和所发送的具体命令,限制对逻辑卷的访问。
控制器总是以好状态响应来自任何主机和对任何LUN的SCSI查询命令。如果该主机没有对该逻辑卷的访问,则控制器返回查询数据,以外围限制符设置指出该目标能支持这个LUN上的指定装置类型,但当前没有装置连接到那个LUN。如果该主机确有对该逻辑卷的访问,则控制器返回它的正常查询数据。SCSI报告LUN命令总使在LUN0上被支持,不管发送该命令的主机或接收该命令的控制器端口是哪个。该控制器返回的信息只是关于发命令请求的主机有访问的那些LUN。对于SCSI请求感知命令,如果一主机没有对针对LUN的访问,则控制器返回感知数据,该数据具有感知关键字设为“非法请求”,而附加感知代码设为“逻辑单元不被支持”。所有其它标准SCSI命令以“检查条件”状态和自动感知数据作为终结,这些自动感知数据包含设置为“非法请求”的感知关键字和设置为“逻辑单元不被支持”的附加感知代码。当一个命令操作指定逻辑卷时,如果该主机不可以访问所针对的逻辑卷,则这些命令通常以检查条件状态终止。
作为举例而不是很限定,本发明的结构和方法支持多种不同的多主机配置,包括同一NT主机内的多HBA,多NT主机,在同一IRIX主机内的多HBA以及有混合操作系统(例如IRIX和NT)的多主机。
本发明的结构和方法还可以应用于因特网配置或用于主计算计系统和/或装置的任何互联网络,如广域网(WAN)和存储区域网络(SAN)。在外部通信网速度加快的同时,存储区域网给速度保持比它快约10倍。再有,尽管我们描述的是基于光纤通道装置的WWN的结构和方法,但其它唯一标识符也可以使用,例如嵌入某些主计算机处理器芯片(如IntelPentium(奔腾)III微处理器芯片)中的序列号。这些和其他标识符可以被选用。随着外部网(WAN)带宽变得比得上存储区域网络(SAN),这里所描述的结构、过程和方法可以实现于因特网上的或主计算机、存储装置、信息设备等的其他互联网络上的分布式存储器,其方式很像因特网上网也得分布和链接。
再有,这里在上文中描述的方法和系统适合于在各类可抽行介质中执行,包括存储器装置和不同于存储器装置的其他介质,如随机存取存储器。能使用其他类型的可执行介质,例如但不限于计算机可读存储介质,它可以是任何存储装置,光盘,硬磁盘,ROM,RAM,CR-ROM盘,DVD,光介质,磁光介质或软盘。
前文的描述为了解释的目的使用了具体的名称已提供对本发明的彻底理解。然而,对本领域技术人员而言,显然并不需要这些具体细节来实现本发明。在其他情况下,公知的电路和装置以防框图的形式显示,以避免不必要的从下面的发明中分散注意力。这样,上文对本发明具体实施例的描述是为了演示和描述的目的而呈现的。不是要用它们来穷尽地包括本发明或把本发明限制于恰好是所公开的形式,显然,在考虑上文讲解的内容后,许多修改和变化时可能的。这些实施例的选择和描述是为了最好地解释本发明的原理及其实际应用,从而使本领域其他技术人员能最好地利用本发明和带有各种修改的各种实施例,以适合于所预想的具体应用。本发明的范围要由下述权利要求及其等同物定义。
按照条约第19条的修改
1.一种在具有多个计算机和至少一个与所述多个计算机相连的硬件装置的计算机系统中,控制所述多个计算机之一对所述硬件装置的访问的方法,所述方法包含:
使局部唯一标识符与所述多个计算机中的每一个相关联;
在存储器中定义一个数据结构,使用所述局部唯一标识符来标识所述计算机中哪些特定计算机是根据所述计算机和所述硬件装置之间的逻辑配置被允许访问所述装置的,该逻辑配置允许一个或多个计算机访问所述硬件装置;以及
查询所述数据结构,以确定所述计算机中发请求的一个是否应被允许访问所述硬件装置。
2.权利要求1的方法,其中所述在存储器中定义一个数据结构进一步包含:
在所述存储器中定义一个主计算机ID映射数据结构;
在所述存储器中定义一个含有多个端口映射表条目的端口映射表数据结构,
在所述存储器中定义一个主机标识符列表数据结构;
在所述存储器中定义一个卷许可表数据结构;以及
在所述存储器中定义一个卷号表数据结构。
3.权利要求1的方法,其中所述数据结构是定义在控制所述硬件装置的存储器控制器的存储器中。
4.权利要求2的方法,其中所述数据结构是定义在控制所述硬件装置的存储器控制器的存储器中。
5.权利要求2的方法,其中所述计算机标识符包含一个世界范围号标识符。
6.权利要求1的方法,其中所述硬件装置包含至少一个信息存储装置。
7.权利要求2的方法,其中所述硬件装置包含至少一个被配置为逻辑卷的硬盘驱动器存储装置。
8.权利要求2的方法,其中所述硬件装置包含一个RAID存储器系统,所述控制器包含一个RAID阵列控制器。
10.一个计算机互联网络,包含:
至少一个共享硬件装置;
多个主计算机,通过通信通道被连接到所述硬件装置并具有局部唯一节点标识符;
一个控制器,被连接在所述多个主计算机和所述至少一个共享硬件装置之间,并控制所述主计算机对所述硬件装置的访问;
一个定义在所述控制器的存储器中的数据结构,包括:(i)主计算机ID映射数据结构;(ii)含有多个端口映射表条目的端口映射表数据结构;(iii)在所述存储器中的主机标识符列表数据结构;(iv)卷许可表数据结构;以及(v)卷号表数据结构。
11.权利要求10的计算机互联网络,其中所述至少一个共享硬件装置包含信息存储装置。
12.权利要求10中的计算机互联网络,其中所述至少一个共享硬件装置包含盘驱动器存储子系统的逻辑卷。
13.权利要求10中的计算机互联网络,其中所述通信通道包含光纤通道判优环路通信通道。
14.权利要求10中的计算机互联网络,其中所述局部唯一节点标识符包含世界范围号(WWN)标识符。
15.权利要求10中的计算机互联网络,其中所述硬件装置包含存储区域网络。
16.权利要求10中的计算机互联网络,其中:
所述至少一个共享硬件装置包含盘驱动器存储子系统的逻辑卷;
所述通信通道包含光纤通道判优环路通信通道;以及
所述局部唯一节点标识符包含世界范围号(WWW)标识符。
17.一种与一计算机系统一同使用的计算机程序产品,该计算机系统有多个主计算机和至少一个共享硬件装置,该计算机程序产品包含计算机可读存储介质和嵌入其中的计算机程序构制,该计算机程序机制包含:
用于控制所述多个主计算机之一对所述共享硬件装置的访问的一个程序模块,该程序模块包括指令用于:
使局部唯一标识符与所述多个计算机中的每一个相关联;
在存储器中定义一个数据结构,使用所述局部唯一标识符来标识所述计算机中哪些特定计算机是根据所述计算机和所述硬件装置之间的逻辑配置被允许访问所述装置的,该逻辑配置允许一个或多个计算机访问所述硬件装置;以及
查询所述数据结构,以确定所述计算机中发请求的一个是否应被允许访问所述硬件装置。
18.权利要求17的计算机程序产品,其中所述程序模块进一步包括指令用于:
在存储器中定义一个主计算机ID映射数据结构;
在所述存储器中定义一个含有多个端口映射表条目的端口映射表数据结构;
在所述存储器中定义一个主机标识符列表数据结构;
在所述存储器中定义一个卷许可表数据结构;以及
在所述存储器中定义一个卷号表数据结构。
19.权利要求17的计算机程序产品,其中所述程序模块进一步包含指令用于:
查询所述数据结构,以确定是否允许对所述硬件装置的访问。
20.权利要求17的计算机程序产品,其中所述硬件装置包含存储区域网络。
21.一个用于控制对至少一个共享硬件装置的访问的控制器,该硬件装置用通信通道与多个主计算机相连并具有局部唯一节点标识符,所述控制器包含:
一个处理器;
与所述处理器相连的存储器,并用于存储指令以处理与所述硬件装置的输入/输出操作和定义数据结构;
所述数据结构包含:(i)主计算机ID映射数据结构;(ii)含有多个端口映射表条目的端口映射表数据结构;(iii)主机标识符列表数据结构;(iv)卷许可表数据结构;以及(v)卷号表数据结构。
22.权利要求21中的控制器,其中所述至少一个共享硬件装置包含信息存储装置。
23.权利要求21中的控制器,其中所述至少一个共享硬件装置包含盘驱动器存储子系统的逻辑卷。
24.权利要求21中的控制器,其中所述通信通道包含光纤通道判优环路通信通道。
25.权利要求21中的控制器,其中所述局部唯一节点标识符包含世界范围号(WWN)标识符。
26.权利要求21中的控制器,其中所述硬件装置包含存储区域网络。
27.权利要求21中的控制器,其中:
所述至少一个共享硬件装置包含盘驱动器存储子系统的逻辑卷;
所述通信通道包含光纤通道判优环路通信通道;以及
所述局部唯一节点标识符包含世界范围号(WWN)标识符。
28.权利要求21中的控制器,其中所述指令包括指令用于:
使局部唯一标识符与所述多个计算机中的每一个相关联;
在所述存储器中定义一个数据结构,以根据所述局部唯一标识符来标识所述计算机中哪些特定计算机可被允许访问所述装置;以及
查询所述数据结构,以确定所述计算机中发请求的一个是否应被允许访问所述硬件装置。
29.权利要求28中的控制器,其中所述指令进一步包括指令用于:
在所述存储器中定义一个主计算机ID映射数据结构;
在所述存储器中定义一个含有多个端口映射表条目的端口映射表数据结构;
在所述存储器中定义一个主机标识符列表数据结构;
在所述存储器中定义一个卷许可表数据结构;以及
在所述存储器中定义一个卷号表数据结构。
Claims (19)
1.一种在具有多个计算机和至少一个与所述多个计算机相连的硬件装置的计算机系统中,控制所述多个计算机之一对所述硬件装置的访问的方法,所述方法包括如下步骤:
使局部唯一表识符与所述多个计算机中的每一个相关联;
在存储器中定义一个数据结构,以根据所述局部唯一标识符来标识所述计算机中哪些特定计算机可能允许访问所述装置;以及
查询所述数据结构,以确定所述计算机中发请求的一个是否应被允许访问所述硬件装置。
2.权利要求1的方法,其中所述在存储器中定义一个数据结构的步骤进一步包含如下步骤:
在所述存储器中定义一个主计算机ID映射数据结构;
在所述存储器中定义一个包含多个端口映射表条目的端口映射表数据结构,
在所述存储器中定义一个主机标识符列表数据结构;
在所述存储器中定义一个卷许可表数据结构;以及
在所述存储器中定义一个卷号表数据结构。
3.权利要求1的方法,其中所述数据结构是定义在控制所述硬件装置的存储器控制器的存储器中。
4.权利要求2的方法,其中所述数据结构是定义在控制所述硬件装置的存储器控制器的存储器中。
5.权利要求2的方法,其中所述计算机标识符包含一个世界范围号标识符。
6.权利要求1的方法,其中所述硬件装置包含至少一个信息存储装置。
7.权利要求2的方法,其中所述硬件装置包含至少一个被配置为逻辑卷的硬盘驱动器存储装置。
8.权利要求2的方法,其中所述硬件装置包含一个RAID存储器系统,所述控制器包含一个RAID阵列控制器。
10.一个计算机互联网络,包含:
至少一个共享硬件装置;
多个主计算机,通过通信通道被连接到所述硬件装置并具有局部唯一节点标识符;
一个控制器,被连接在所述多个主计算机和所述至少一个共享硬件装置之间,并控制所述主计算机对所述硬件装置的访问;
一个定义在所述控制器的存储器中的数据结构,包括:(i)主计算机ID映射数据结构;(ii)含有多个端口映射表条目的端口映射表数据结构;(iii)在所述存储器中的主机标识符列表数据结构;(iv)卷许可表数据结构;以及(v)卷号表数据结构。
11.权利要求10的计算机互联网络,其中所述至少一个共享硬件装置包含信息存储装置。
12.权利要求10中的计算机互联网络,其中所述至少一个共享硬件装置包含盘驱动器存储子系统的逻辑卷。
13.权利要求10中的计算机互联网络,其中所述通信通道包含光纤通道判优环路通信通道。
14.权利要求10中的计算机互联网络,其中所述局部唯一节点标识符包含世界范围号(www)标识符。
15.权利要求10中的计算机互联网络,其中所述硬件装置包含存储区域网络。
16.权利要求10中的计算机互联网络,其中:
所述至少一个共享硬件装置包含盘驱动器存储子系统的逻辑卷;
所述通信通道包含光纤通道判优环路通信通道;以及
所述局部唯一节点标识符包含世界范围号(www)标识符。
17.一种与一计算机系统一同使用的计算机程序产品,该计算机系统有多个主计算机和至少一个共享硬件装置,该计算机程序产品包含计算机可读存储介质和嵌入其中的计算机程序机制,该计算机程序机制包含:
用于控制所述多个主计算机之一对所述共享硬件的访问的一个程序模块包括指令用于:
使局部唯一标识符与所述多个计算机中的每个相关联;
在存储器中定义一个数据结构,以根据所述局部唯一标识所述计算机中哪些特定计算机可能允许访问所述装置;以及
查询所述数据结构,以确定所述计算机中发请求的一个是否应被允许访问所述硬件装置。
18.权利要求17的计算机程序产品,其中所述程序模块进一步包括指令用于:
在存储器中定义一个主计算机ID映射数据结构;
在所述存储器中定义一个含有多个端口映射表条目的端口映射表数据结构;
在所述存储器中定义一个主机标识符列表数据结构;
在所述存储器中定义一个卷许可表数据结构;以及
在所述存储器中定义一个卷号表数据结构。
19.权利要求17的计算机程序产品,其中所述程序模块进一步包含指令用于:
查询所述数据结构,以确定是否允许对所述硬件装置的访问。
20.权利要求17的计算机程序产品,其中所述硬件装置包含存储区域网络。
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AU6494600A (en) | 2001-04-17 |
US6343324B1 (en) | 2002-01-29 |
WO2001020470A1 (en) | 2001-03-22 |
EP1221100A1 (en) | 2002-07-10 |
EP1221100A4 (en) | 2007-07-18 |
CN1168020C (zh) | 2004-09-22 |
JP2003509773A (ja) | 2003-03-11 |
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