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Operating Systems AIX Must restore data to DR server Post 302261578 by bakunin on Tuesday 25th of November 2008 05:30:58 AM
Old 11-25-2008
Quote:
Originally Posted by pobman
was not sure about the PP though how can I tell what I should use? So I left it as 32MB
When a disk is added to a VG it is divided in parts the size of PPsize.

So you can tell by applying LVM restrictions: a single disk can hold max. 1019 PPs. If you have disks approximately 32GB in size you can go with a PP size of 32MB, arriving at ~1000 PPs per disk. If your disks are considerably larger than this you would only be able to use the first 32GB (1019x32MB to be exact) of the disk, losing the rest of it.

Since it is a good idea of leaving room for expansion everywhere consider using a PP size which divides the disk in 200-500 parts. For example: for 72GB disks use a PP size of 256MB giving ~300 PPs. This would allow for the use of disks up to 260GB without losing space.

I hope this helps.

bakunin
 

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volreattach(8)						      System Manager's Manual						    volreattach(8)

NAME
volreattach - Reattaches disk drives that have once again become accessible SYNOPSIS
/usr/sbin/volreattach [-rb] [accessname...] /usr/sbin/volreattach -c accessname OPTIONS
The volreattach utility has the following options: Calls the volrecover utility to attempt to recover stale plexes of any volumes on the failed disk. Performs the reattach operation in the background. Checks whether 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. DESCRIPTION
The volreattach utility attempts to reattach disks using the same disk group and media names they had before detachment. This operation may be necessary if a disk has a transient failure, or if some disk drivers are unloaded or unloadable when the Logical Storage Manager is started, causing disks to enter the failed state. If the problem is fixed, the volreattach command can be used to reattach the disks without plexes being flagged as stale, as long as the reattach happens before any volumes on the disk are started. The volreattach command is called from the voldiskadm menus as part of disk recovery. The volreattach utility tries to find a disk with a disk group and disk ID matching that of the disk(s) being reattached. If the matching disk is found, the reattach operation may still fail if the original cause (or some other cause) for the disk failure still exists. EXIT CODES
A zero exit status is returned if it is possible to perform a reattach. Otherwise, non-zero is returned. SEE ALSO
volintro(8), voldiskadm(8), volrecover(8) volreattach(8)
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