[lustre-discuss] migrating mgs and mdt

[Lana Deere]

I am managing a Lustre 2.12.6 system where I have just discovered that the
MGS and MDTs are on single disks rather than RAIDed drives.

/dev/sda5 on /mnt/lustre_mgs type lustre
(ro,svname=MGS,nosvc,mgs,osd=osd-ldiskfs,...)
/dev/sdc1 on /mnt/lustre_mdt_abc type lustre
(ro,svname=lstr_abc-MDT0000,mgsnode=10.58.255.254 at o2ib,osd=osd-ldiskfs,...)
/dev/sdb1 on /mnt/lustre_mdt_def type lustre
(ro,svname=lstr_def-MDT0000,mgsnode=10.58.255.254 at o2ib,osd=osd-ldiskfs,...)

Is there any way to migrate those three metadata partitions to other
partitions which would presumably be located on RAIDed drives?  For
example, would it work to set up the new RAIDed drives and use dd to clone
the partitions into partitions on the RAID?

.. Lana (lana.deere at gmail.com)
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