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[linux-lvm] LVM partition growth after Dell MegaRAID RAID array growth


I'm in the process of installing (so fortunately can reformat, rinse, repeat as necessary) a new Dell PowerVault attached to a PowerEdge running RHEL3.

I'm looking to have the facility to be able to grow the RAID arrays at a later date. The Dell PERC 4/DC card installed supports growing the RAID array, however since I created the physical volume to utilise the whole disk it hasn't seen the growth in the PV:

[root nbg01-filer-01 root]# pvdisplay /dev/sdb
--- Physical volume ---
PV Name               /dev/sdb
VG Name               splitbus0
PV Size               546.48 GB [1146060800 secs] / NOT usable 32.25 MB [LVM: 196 KB]
PV#                   1
PV Status             NOT available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       32768
Total PE              17486
Free PE               0
Allocated PE          17486
PV UUID               duXmrI-c1d0-pPew-VNL4-ce6N-5h14-6swMqK

However lvmdiskscan recognises that the disk has grown in capacity:

[root nbg01-filer-01 root]# lvmdiskscan
lvmdiskscan -- reading all disks / partitions (this may take a while...)
lvmdiskscan -- /dev/sdb   [     683.11 GB] USED LVM whole disk
> ...

Looking at the lists I realise that extending the physical volumes isn't supported yet.

So, to ask my question (about time too I hear you say), what advice would you give me in order to achieve expandability of the RAID array at a later date when we have filled existing capacity?

Should I partition /dev/sdb before I create the physical volume and then partition any new space which is added and then add those partitions to the volume group? Or is there some more clever way to do it?


David Grierson
t: 0845 1199 900
d: +44 131 514 4053

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