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Re: [dm-devel] online disk resizing



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 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

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