Hi, We have a combined MGS+MDT and I'm looking for a migration to new storage with a minimal disruption to the running jobs on the cluster.
Can anyone find problems in the scenario below and/or suggest another solution? I would appreciate also "no problems" replies to reassure the scenario before I proceed. Current configuration: The mdt is a logical volume in a lustre_pool VG on a /dev/mapper/MDT0001 PV Migration plan: Add /dev/mapper/MDT0002 new disk (multipath) extend the VG: pvcreate /dev/mapper/MDT0002 vgextend lustre_pool /dev/mapper/MDT0002 mirror the mdt to the new disk: lvconvert -m 1 /dev/lustre_pool/TECH_MDT /dev/mapper/MDT0002 wait the mirrored disk to sync: lvs -o+devices when it's fully synced unmount the MDT, remove the old disk from the mirror: lvconvert -m 0 /dev/lustre_pool/TECH_MDT /dev/mapper/MDT0001 and remove the old disk from the pool: vgreduce lustre_pool /dev/mapper/MDT0001 pvremove /dev/mapper/MDT0001 remount the MDT and let the clients few minutes to recover the connection. Thanks, David
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