Question

Expand Linux Partition that resides on SAN

Asked by: hdainc

We have a redhat linux server with a virtual disk that resides on our SAN.  We just added a couple hundred more gigs to the vdisk for the linux server.  The SAN knows that we added the space but we cant get Linux to see the change.

The following commands have been used with no luck:

# umount /data
# vgdisplay
# e2fsadm -L+5000M /dev/vg0/data
# vgdisplay
 
&
 
# resize2fs /dev/sdb  500G

                                  
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Asked On
2009-09-30 at 11:27:21ID24774628
Tags

SAN linux redhat partition hard drive disk format extend

Topics

Red Hat Linux

,

Disk Partition Tools

,

Linux Setup

Participating Experts
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Comments
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Answers

 

by: it4sohoPosted on 2009-09-30 at 14:17:55ID: 25463744

It looks to me like you've found documentation for LVM1, when you're probably using LVM2.

Try these 2 command lines for use with LVM2:
   # lvextend -L+500M /dev/vg0/data
   # resize2fs /dev/vg0/data

(At issue -- and in the WTMI department -- is that e2fsadm is a LVM1 command, and there is no equivalent for LVM2. That e2fsadm program is supposed to do the resize of the partition (lvextend) AND the filesystem (resize2fs) at the same time. But it doesn't work on LVM2

PLEASE check your system for LVP packages -- you should be running LVM2 and NOT LVM1! (You may have both if you've upgraded the system or otherwise updated since original install... LVM2 packages should be version 2.02 or later).

Let me know how this works! :-)

Dan
IT4SOHO

 

by: computerfixinsPosted on 2009-09-30 at 22:56:38ID: 25466236

Have you rebooted since adding the space?

RHEL4 and RHEL5  get somewhat grumpy when you change the size of a SAN device; i have had limited luck forcing a rescan.

does /proc/partitions have the correct size?

 

by: computerfixinsPosted on 2009-09-30 at 22:58:57ID: 25466244

you can try something like:

echo "- - -" > /sys/class/scsi_host/host?/scan

to force a rescan

 

by: computerfixinsPosted on 2009-09-30 at 22:59:49ID: 25466251

also be sure that nothing is using the SAN before force a rescan!!!  

That includes LVM...

 

by: hdaincPosted on 2009-10-02 at 06:27:27ID: 25477628

Heres a rundown of the commands to extend an LVM volume after adding space on the LUN:

(Keep in mind that if you remove the LUN presented as /dev/sdb, the current /dev/sdc device may become /dev/sdb instead.  If so, just sub sdb for sdc)

Use fdisk /dev/sdc to create a new partition, and make it type 8e.

(below steps assume you just created /dev/sdc2)

partprobe /dev/sdc

pvcreate /dev/sdc2

vgextend SAN /dev/sdc2

lvextend -l +100%FREE /dev/SAN/oracle

e2fsck -f /dev/SAN/oracle (NOTE: do not run e2fsck on a partition that is currently mounted.)

resize2fs /dev/SAN/oracle

mount /dev/SAN/oracle /oracle

If everything tests out OK, then you can edit /etc/fstab, and remove the # from the last line:

/dev/SAN/oracle /oracle         ext3            defaults    1  2

 

by: it4sohoPosted on 2009-10-02 at 07:46:30ID: 25478411

Please help make the archives more useful to later readers:

Exactly which commands solved your problem?

Thanks!

Dan
IT4SOHO

20120131-EE-VQP-002

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