Howdy,
I totally agree.....why on earth has this not been looked more into
!....i would say this would be a very useful feature for anyone running
his RHEL system of a SAN storage system.....
Bgrds,
Finnur
Domenico Viggiani wrote:
I follow dm-devel mailing list and it seems that there was no improvements.
Sincerely, I think that online resizing is crucial for enterprise storage
systems.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Pasi Kärkkäinen
Sent: Thursday, July 24, 2008 2:17 PM
To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
Subject: Re: [rhelv5-list] RE: multipathing in RHEL5
On Mon, Jul 21, 2008 at 06:46:47PM +0200, Domenico Viggiani wrote:
It seems that online resizing of a multipath device is
actually impossible:
http://www.redhat.com/archives/dm-devel/2007-August/msg00205.html
Hmm.. is this still the case nowadays? :(
Anyone working on getting this fixed?
-- Pasi
This is my personal offline how-to:
# Rescan devices (for all 4 paths)
echo "1" >
/sys/bus/scsi/drivers/sd/<h>\:<b>\:<t>\:<l>/block/device/rescan
...
# Check /var/log/messages
# Trespass LUN by Navisphere
# Rescan devices (for all 4 paths)
echo "1" >
/sys/bus/scsi/drivers/sd/<h>\:<b>\:<t>\:<l>/block/device/rescan
...
# Check /var/log/messages
# Umount filesystem
# Deactivate VG
vgchange -an vg_LUN
# Delete and recreate multipath device multipath -F multipath -v2
multipath -ll # Activate VG vgchange -ay vg_LUN # Remount
filesystem #
Extend PV pvresize /dev/mapper/<long-multipath-identifier>
# Check VG
vgdisplay -v vg_LUN
# Extend LV
lvextend -l +256 /dev/vg_LUN/lvol...
# Extend FS
ext2online /dev/vg_LUN/lvol...
Alternatively, you can create an additional LUN and add it to the VG
(online)
If someone is able to find a better method, please post it!
--
Domenico Viggiani
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Collins, Kevin
[Beeline]
Sent: Monday, July 21, 2008 6:31 PM
To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
Subject: RE: [rhelv5-list] RE: multipathing in RHEL5
What about if the LUN is an LVM physical volume (PV) already?
Can you use pvresize?
Thanks,
Kevin
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Domenico
Viggiani
Sent: Monday, July 21, 2008 1:28 AM
To: 'Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list'
Subject: [rhelv5-list] RE: multipathing in RHEL5
We are currently using native Red Hat multipath with an
EMC Clariion
CX700 disk-array. No problem at all, you need only to be
well-disciplined and methodical with creating/destroying
LUNs. Only
real BIG problem is that you cannot resize a LUN online
(unless you
add PV to an existing VG, using LVM).
Bye
--
Domenico Viggiani
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