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Using ZFS with Veritas Cluster Server

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Operating Systems Solaris Using ZFS with Veritas Cluster Server
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Old 02-10-2013
Wrench Using ZFS with Veritas Cluster Server
Until I really began to explore the practical implications of using ZFS with VCS, I would not have necessarily realised the obstacles that would be put in my path. Data integrity is a must-have for storage in a shared host environment, so it surprised me to learn as I opened this particular Pandora's box that VCS provides no solution at all for ensuring data integrity on any of the ZFS pools that are a part of your cluster. The 'Zpool' agent is dumb. It imports the pool. It exports the pool. "What about SCSI-3 persistent reservations?", I hear you ask. What about them, indeed. ZFS is a competing product, I won't expect an answer to that problem coming from the Symantec camp. So I took up the gauntlet on a mission to add SCSI-3 PR support to the Zpool agent for my client. I succeeded. So I have written up some notes that might help direct others should they stumble across the same obstacles, and along the way I've discovered the benefits that Solaris MPxIO has to offer that are superior to VxDMP.

Technical Prose: SCSI-3 PR with ZFS on Veritas Cluster Server
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LEARN ABOUT OPENSOLARIS

acl_check

acl_check(3SEC) 				       File Access Control Library Functions					   acl_check(3SEC)

NAME

       acl_check - check the validity of an ACL

SYNOPSIS

       cc [ flag... ] file... -lsec [ library... ]
       #include <sys/acl.h>

       int acl_check(acl_t *aclp, int isdir);

DESCRIPTION

       The  acl_check()  function  checks the validity of an ACL pointed to by aclp. The isdir argument checks the validity of an ACL that will be
       applied to a directory. The ACL can be either a POSIX draft ACL as supported by UFS or NFSv4 ACL as supported by ZFS or NFSV4.

       When the function verifies a POSIX draft ACL, the rules followed are described in aclcheck(3SEC).  For  NFSv4  ACL,  the  ACL  is  verified
       against the following rules:

	   o	  The inheritance flags are valid.

	   o	  The ACL must have at least one ACL entry and no more than {MAX_ACL_ENTRIES}.

	   o	  The permission field contains only supported permissions.

	   o	  The entry type is valid.

	   o	  The flag fields contain only valid flags as supported by NFSv4/ZFS.

       If any of the above rules are violated, the function fails with errno set to EINVAL.

RETURN VALUES

       If the ACL is valid, acl_check() returns 0. Otherwise errno is set to EINVAL and the return value is set to one of the following:

       EACL_INHERIT_ERROR     There are invalid inheritance flags specified.

       EACL_FLAGS_ERROR       There are invalid flags specified on the ACL that don't map to supported flags in NFSV4/ZFS ACL model.

       EACL_ENTRY_ERROR       The ACL contains an unknown value in the type field.

       EACL_MEM_ERROR	      The system cannot allocate any memory.

       EACL_INHERIT_NOTDIR    Inheritance flags are only allowed for ACLs on directories.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       acl(2), aclcheck(3SEC), aclsort(3SEC), acl(5), attributes(5)

SunOS 5.11							    22 Apr 2008 						   acl_check(3SEC)