Re: how to synchronize two devices (RAID-1, but not really?)

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David Greaves schrieb:

(...)

So I want to synchronize /dev/LVM2/my-volume (ext3) with /dev/sdr (now
empty; bigger than /dev/LVM2/my-volume).


(sda2, sdb2, sdc2, sdd2) -> RAID-10 -> LVM-2 -> my volume -> ext3




I've not used iSCSI but I wonder about using nbd : network block device

Use nbd to export /dev/md5 from machine 2.
Import /dev/nbd0 on machine 1.
Add nbd0 to the VG on machine 1
pvmove the data from /dev/md10 to /dev/nbd0 (ie the md5 on machine2 via nbd)
remove /dev/md10 from the VG.


Hmm, maybe using LVM's mirror would help me here:

CONFIG_DM_MIRROR:

Allow volume managers to mirror logical volumes, also
     needed for live data migration tools such as 'pvmove'.


--
Tomasz Chmielewski
http://wpkg.org
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