topic How to expand drive space on RHEL 4? in HPE EVA Storage

How to expand drive space on RHEL 4?

Boaz Bezborodko — Mon, 03 Jan 2011 19:06:39 GMT

I'm using an ML 370 G2 and have successfully replaced the 5 73GB drives in a RAID 0+1 array. Now I want to make this available and recognizable by the OS. (Actually I am using Centos 4, not RHEL 4.)

What is the process to properly go about doing this?
Some further information:
I am using LVM for the current setup with an ext2 filesystem.

Thanks in advance

Re: How to expand drive space on RHEL 4?

Alzhy — Mon, 03 Jan 2011 20:07:39 GMT

You can use pvresize.

If your enllarged RAID system is say /dev/sdb1 and it is used as a physical volume by an LVM VG - then pvresize should do the trick.

Prior though -- make sure the OS recognizes /dev/sdb is at its correct enlarged size (do a scsi scan and check via fdisk)

Cheers!

Re: How to expand drive space on RHEL 4?

Boaz Bezborodko — Tue, 04 Jan 2011 16:20:22 GMT

>>Prior though -- make sure the OS recognizes /dev/sdb is at its correct enlarged size (do a scsi scan and check via fdisk)

How do I do a rescan? (fdisk doesn't recognize the extra space)

Re: How to expand drive space on RHEL 4?

Alzhy — Tue, 04 Jan 2011 16:28:42 GMT

echo "- - -" > /sys/class/scsi_host/host0/scan

if the disk size is increased.. then fdisk to enlarge the partition and do the pvresize thing.

Caveat! Make sure pvresize is supported in RHEL 4... man pvresize

Re: How to expand drive space on RHEL 4?

Boaz Bezborodko — Tue, 04 Jan 2011 16:43:04 GMT

>>echo "- - -" > /sys/class/scsi_host/host0/scan

>>if the disk size is increased.. then fdisk to enlarge the partition and do the pvresize thing.

It didn't find the additional space.

Am I going to have to reboot?

Re: How to expand drive space on RHEL 4?

Alzhy — Tue, 04 Jan 2011 17:02:37 GMT

I guess so.

Or RHEL 4 does not support online disk/lun ersizing or the Smart Array dose not imediately communicate the geometry chanegs to the OS.

The procedure works with SAN Luns though and on RHEL 5.X

Re: How to expand drive space on RHEL 4?

Alzhy — Wed, 05 Jan 2011 14:46:06 GMT

Awesome... glad to be of some Assistance.

Re: How to expand drive space on RHEL 4?

TarunJain — Wed, 05 Jan 2011 19:41:30 GMT

That was really nice information.

Broaz,
I think you should award some points for this information

Re: How to expand drive space on RHEL 4?

Alzhy — Wed, 05 Jan 2011 20:02:21 GMT

Boaz. thanks.

I did not actually catch your post mortem comment:

"I used Webmin to create the 'Linux LVM' partition "

That to me indicates you did not opt to use fdisk to extend the partition and use pvresize to enlarge the underlying existing PV... Glad it works though.

Also, that SCSI scan -- it really should have worked. maybe your RAID controller is not host0? Or maybe the RAID controller is not on the path I posted?

EIther way -- kool that it works...

Re: How to expand drive space on RHEL 4?

Boaz Bezborodko — Wed, 05 Jan 2011 20:25:58 GMT

>>That to me indicates you did not opt to use fdisk to extend the partition and use pvresize to enlarge the underlying existing PV... Glad it works though.

Turns out that it didn't work. I would still have to do some other tasks to add the group.

I decided to try pvresize instead, but first I need help in how to use fdisk to expand the partition.

>>Also, that SCSI scan -- it really should have worked. maybe your RAID controller is not host0? Or maybe the RAID controller is not on the path I posted?

I have the volume set up on a SmartArray 5300 that I believe is located at host1. Either way it didn't work there either.