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Operating Systems AIX How to manually -re-attach AIX lv's to a mirror? Post 303029628 by bakunin on Tuesday 29th of January 2019 10:27:31 PM
Old 01-29-2019
Quote:
Originally Posted by mrmurdock
IBM did a vgda map of hdisk1 with dd.
There is a little-known tool called readvgda which does what its name suggests - read the VGDA and print its content out to screen. I use it regularly when working on (to me) unknown systems when i need to find out about the VG type (classic, big or scalable) because otherwise there is no direct way to get that information elsewhere. You can use it for any other purposes too, though. The format is:

Code:
readvgda hdiskN [ | more]

where hdiskN is any hdisk device in the VG. Here is a longer article about it but knowing what to search for you find many others too.

The VGDA is stored in (at least) two different locations of the disk and if one is broken you may still read the other one and use that. You can easily do that with dd so you won't need IBM to do that for you. Of course this is a potentially risky operation so my suggestion is to test it first on a throwaway system/disk to get acquainted.

I hope this helps.

bakunin
 

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vxreattach(1M)															    vxreattach(1M)

NAME
vxreattach - reattach disk drives that have once again become accessible SYNOPSIS
/etc/vx/bin/vxreattach [-br ] [accessname...] /etc/vx/bin/vxreattach -c accessname DESCRIPTION
The vxreattach utility reattaches disks to the disk group they were in and retains the same media name. This operation may be necessary if a disk has a transient failure, or if Veritas Volume Manager (VxVM) starts with some disk drivers unloaded and unloadable. Disks then enter the failed state. If the problem is fixed, vxreattach may be able to reattach the disks without plexes being flagged as stale, as long as the reattach happens before any volumes on the disk are started. vxreattach tries to find a disk in the same disk group with the same disk ID for the disk(s) to be reattached. The reattach operation may fail even after finding the disk with the matching disk ID if the original cause (or some other cause) for the disk failure still exists. vxreattach is usually invoked by vxdiskadm when performing disk recovery. It is not intended to be run directly by an administrator. OPTIONS
-b Performs the reattach operation in the background. -c Checks if a reattach is possible. No operation is performed, but the name of the disk group and disk media name at which the disk can be reattached is displayed. -r Tries to recover stale plexes of any volumes on the failed disk. It does this by calling vxrecover. EXIT CODES
A zero exit status is returned if the reattach is performed; non-zero is returned otherwise. See vxintro(1M) for a list of standard exit codes. EXAMPLES
Check if reattachment of disk c1t2d0 is possible: /etc/vx/bin/vxreattach -c c1t2d0 If reattachment is possible, vxreattach returns with an exit status of 0 and displays the disk group name and disk media name. If reat- tachment is not possible, vxreattach returns an exit status of 2 and displays an error. Attempt to reattach the disk in the foreground and try to recover stale plexes of any volumes on the disk: /etc/vx/bin/vxreattach -r c1t2d0 If the reattachment is successful, vxreattach returns an exit status of 0. Otherwise, if an error occurs, vxreattach returns a non-zero exit code as defined on vxintro(1M). FILES
/etc/default/vxplex Standard defaults file that can be used to determine whether FastResync is used when attaching plexes. See vxplex(1M) for details. SEE ALSO
vxdiskadm(1M), vxintro(1M), vxplex(1M), vxrecover(1M) VxVM 5.0.31.1 24 Mar 2008 vxreattach(1M)
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