Created
September 20, 2011 22:22
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backup LVM backed iSCSI target
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| I've created a san using Logical Volumes as backing-store iSCSI LUNs (tgt) | |
| the target iqn.2011-09.com.pany.san:target1 using the LV /dev/vg0/t1l1 as backing-store | |
| the initiator sees the device as /dev/sda | |
| on the initiator i've created 2 partition /dev/sda1 (swap) and /dev/sda2 (ext4) | |
| I want to be able to create backup on of the ext4 fs, without stopping the initiator! | |
| The solution i came up with involves the snapshot feature of LVM, kpartx from multipath-tools and some backup method (i prefer rdiff-backup or safekeep). | |
| steps: | |
| 1. lvcreate -s -n sh -L 10G /dev/vg0/t1l1 | |
| 2. kpartx -a /dev/mapper/vg0-sh | |
| 3. mount /dev/mapper/vg0-shp2 /mnt/backup | |
| 4. do the backup (rdiff-backup, safekeep, or just copy the files) | |
| 5. umount /dev/mapper/vg0-shp2 | |
| 6. kpartx -d /dev/mapper/vg0-sh | |
| 7. lvremove /dev/vg0/sh | |
| That it! :) |
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