Linux – Migrating the SAN lun in Linux

linuxlunstorage-area-network

How to perform LUN migration in Linux (using LVM and native multipath) from one storage device to another storage device

Best Answer

Expanding on janneb's comment because I want formatting:

Given:

/dev/oldSAN1 (Linux LVM partition)
/dev/newSAN1 (linux LVM partition)
VG "mystuff"

Then:

# pvcreate /dev/newSAN1
# vgextend mystuff /dev/newSAN1
# pvmove -v /dev/oldSAN1
# vgreduce -a mystuff
# pvremove /dev/oldSAN1

Obviously, make sure you have a good backup before starting. /dev/newSAN1 has to be as large as or larger than /dev/oldSAN1 as you'd think.

Related Solutions

Linux – The Linux SCSI layer does not automatically remap LUN assignments

If you're adding a new LUN, and your iscsi initiator is already connected, you just have to rescan your iscsi bus for the new LUN:

for i in /sys/class/scsi_host/host*/scan ; do echo - - - > $i ; done

If you're changing the size / geometry of a LUN, you'll also need to rescan the device:

for i in /sys/class/scsi_device/*/device/rescan ; do echo 1 > $i ; done

That works for me. If it does not for you, you can try to rescan the iscsi session:

iscsiadm -m node -R

You should really use UUIDs or WWIDs (when working with multipath) so that you don't have to rely on device names.

Linux – Mount LUN from SAN at the same time in Windows and Linux

As far as I know NTFS is not meant to be used like that and the only thing you will probably achieve this way is invalid data read from the filesystem.

You can either unmount the filesystem from windows and mount it on linux for the migration, or you can use some clustering filesystem for this purpose. Unfortunatelly I know of no opensource cluster filesystem that is capable of this.

I believe CXFS and StorNext should be able to do what you want.

Best Answer

Related Solutions

Linux – The Linux SCSI layer does not automatically remap LUN assignments

Linux – Mount LUN from SAN at the same time in Windows and Linux

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