"VxVM vxassist ERROR V-5-1-437 Cannot allocate space to mirror block volume" is returned by vxassist mirror
Problem
The command "vxassist mirror" fails to mirror a striped volume even though disk group has enough free space
Cause
Storage Foundation requires that mirrored plexes do not share disk media. By default, Storage Foundation will attempt to create a mirror plex with the same layout as the original plex.
For example:
vxprint shows that the volume named "hvol" is a stripe volume with 3 columns. It is using disk01, disk03, and disk04.
# vxprint -g demodg -htq dg demodg default default 0 1171477255.1025.mtvv240-06 dm disk01 Disk_1 auto 2888 71124291 - dm disk02 Disk_21 auto 5111 35533512 - dm disk03 Disk_19 auto 5111 35533512 - dm disk04 Disk_20 auto 5111 35533512 - v hvol - ENABLED ACTIVE 81920 SELECT hvol-01 fsgen pl hvol-01 hvol ENABLED ACTIVE 86490 STRIPE 3/128 RW sd disk01-01 hvol-01 disk01 2888 28890 0/0 Disk_1 ENA sd disk03-01 hvol-01 disk03 0 28116 1/0 Disk_19 ENA sd disk04-02 hvol-01 disk04 207036 28116 2/0 Disk_20 ENA |
The mirror creation fails because volume manager is attempting to create a new, 3-column plex. But there is only 1 disk available.
# vxassist -g demodg mirror hvol VxVM vxassist ERROR V-5-1-437 Cannot allocate space to mirror 81920 block volume # vxassist -g demodg maxsize Maximum volume size: 171134976 (83562Mb) |
Solution
1. First, use vxassist to confirm that there is enough free space.
For example:
# vxassist -g <dg> maxsize
Maximum volume size: <number_of_blocks> (<number_of_megabytes>Mb)
2. If there is enough free space, use vxassist to specify layout attributes for the new mirror that conform to your available disk structure.
# vxassist -g demodg mirror hvol layout=concat alloc=disk02
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