04-17-2009
Adding external disk array to a live server
Hi all
Ive got a v440 with an external T3 RAID in a dual bus configuration. I need to add an additional JBOD extension to the disk array via two VDCH cables.
Now, can I do this as the server is live ? Can I just plug the two cables in, switch on the additional extension ? Will this cause the scsi bus to go wild / panic ?
Getting down time for this job will be hard, and the paperwork to get it actioned is 15x harder than the job :-) So, Im aiming at doing the connecting as the server is up, but want to know if its possible ?
I was thinking that I just plug the second array / disk pack in, switch on. But not sure if the current disk array will see it, or if I need to do something for the new disks to be seen via the array.
Any pointers / opinions / or thoughts are humbly recieved :-)
Cheers
Simon K
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LEARN ABOUT HPUX
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)