[dm-devel] online disk resizing

Kevin Foote kevin.foote at gmail.com
Thu Jul 5 12:56:08 UTC 2007


Alexander
Here is what I do (RHEL4u4) I use iscsi over a qlogic HBA but its basically
the same.. still "scsi" to RH :-)
Oh yea no partitions on my volumes either, It seems cleaner that way.

1. stop access to volume and unmount
2. resize your san volume
3. locate the scsi target number
    > cat /proc/scsi/qla4xxx/<controller>
   I find the volume Im interested in via our naming schema .. your milage
my very with that.
   I now have my volume def in scsi terms .. ie 2 0 2 0 or <host> <channel>
<scsi id> <lun>
4. remove and readd the scsi device
   > echo "scsi remove-single-device 2 0 2 0" > /proc/scsi/scsi
   > echo "scsi add-single-device 2 0 2 0" > /proc/scsi/scsi
6. at this point I have a new scsi device ie /dev/sdg or such which should
reflect the new size via your dmesg
   ( i usually have a tail -f of /var/log/messages going :-)
7. next run my ext2online to get the FS in sync with the actual size of the
volume
8. remount and re access the volume

Hope that helps out some ..

-- 
:wq!
kevin.foote

On 7/5/07, Alexander Benaguev <zul at sigmatrans.ru> wrote:
>
> Raayman, Sebastian wrote:
> > this is also dependant on the HBA you are using. With a Qlogic adapter
> > you can simply send an:
> >
> > echo scsi-qlascan
> >
> > to your Qlogic adapter (for example under /proc/scsqi/qla2xxx)
>
> thanks for attention, guys
>
> Sebastian, yes, I use qlogic, but, you will laught, I have not
> /proc/scsqi/qla2xxx. googling around
> shows that:
> "as of RHEL4 U3 (and I'd imagine upstream kernel.org kernels) the
> 'scsi-qlascan' no longer works
> with the qla2xxx driver. The new method is:
>
> echo 1 > /sys/class/fc_host/host<ID>/issue_lip
> echo "- - -" > /sys/class/scsi_host/host<ID>/scan" but it does not work
> for me.
> I tried "echo 1 >
> /sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/0000:06:01.0
> /host1/rport-1:0-1/target1:0:1/1:0:1:2/rescan"
> too. so, it was much better: dmesg showed me disks with new capacity, but
> "fdisk -l" still showing
> old capacity;( any thoughts?
>
> alexander
>
> --
> dm-devel mailing list
> dm-devel at redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/dm-devel/attachments/20070705/8c04d253/attachment.htm>


More information about the dm-devel mailing list