Serial Split Brain detected in solaris10 Post: 302410234

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Operating Systems Solaris Serial Split Brain detected in solaris10 Post 302410234 by upengan78 on Monday 5th of April 2010 11:04:59 AM

04-05-2010

Registered User

Quote:

Now a couple of observations on your setup.

1. Mixing internal and external disks in a volume is a bad idea ( prefereably not in the same DG )

2. If you have to use the internal disks put the log plex on the external disks with one data disk and the spare on the internal disks.

The reason for both of the above is that if you get a failure it is more likely to be consistent. Even if the external disks all fail you should be able to pull the internal disks and reattach the external ones. You will be able to rebuild the one internal data disk from parity.

If you can avoid using the internal disk at all then do. A failure of the external disks is likely to be self consistent in such a scenario and is much easier to recover.

3. Get the SCSI csi controller checked and check for patches for bugs that cause controller failure-like sysmptoms it is likely the original cause of your problem was one or other.

Thank you for your valuable suggestions. I certainly agree.

Problem was that, I wanted some sort of redundancy raid 5 or mirror atleast but I found I am not gaining much by using mirror so I went with raid 5 but then I found I am not getting enough disk space for my data, so I used 2 internal disks for this raid 5 volume.

I now have the backup of data on this volume, if there is anything which can done now, I am willing to do it. Please suggest if you can .

Thanks again.

upengan78

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vxsplitlines

vxsplitlines(1M)														  vxsplitlines(1M)

NAME

       vxsplitlines - show disks with conflicting configuration copies in a cluster

SYNOPSIS

       vxsplitlines [-g diskgroup] [-c daname]

DESCRIPTION

       If  you	import	portions  of a disk group on different systems, this can lead to conflicting configuration copies on the disks of the disk
       group.

       If the configuration information in a disk group is ambiguous, it may not be possible for Veritas Volume Manager to determine which config-
       uration	copy  is  most up-to-date.  (This is usually termed a serial split brain (SSB) condition when it occurs in a cluster.)	You cannot
       import a disk group in this state unless you specify which disk's configuration copy to use.

       You can use the vxsplitlines command to see which disks in a disk group have conflicting configuration copies,  and  use  this  information
       together with your knowledge of the history of the disk groups' usage to determine which configuration copy is most valid.

       The output from vxsplitlines displays the vxdg commands that you can run to import the disk group using the available configuration copies.
       The -o selectcp option of the vxdg import command is used to select the configuration copy to use for the import.

OPTIONS

       -c daname Display the SSB IDs for each disk that are stored in the configuration copy on the disk specified by its disk access name.

		 Note: Although the SSB IDs for some disks may match, this does not necessarily mean that those disks' configuration  copies  have
		 recorded  all	the configuration changes. When viewed from some other configuration copies, the SSB IDs of the same disks may not
		 match.

       -g diskgroup
		 Specifies the disk group. If a disk group is not specified, the default disk group is used as determined from the  rules  on  the
		 vxdg(1M) manual page.

EXAMPLES

       Display the disks on each side of the split in the disk group newdg:

			vxsplitlines -g newdg

       Display the SSB IDs stored in the configuration copy on disk c2t4d0:

			vxsplitlines -g newdg -c c2t4d0

NOTES

       The vxsplitlines is primarily intended to be used with private disk groups, but it also works with shared disk groups.

       The version number of the disk group must be 110 or greater.

SEE ALSO

       vxdg(1M)

       Veritas Volume Manager Administrator's Guide

VxVM 5.0.31.1							    24 Mar 2008 						  vxsplitlines(1M)