[Beowulf] OT: Software RAID & Multipath
csamuel at vpac.org
Mon Jan 8 15:01:35 PST 2007
This is about a storage node for a cluster, so it's partly on topic.. :-)
Through happy coincidence we now have a box with two FC cards going to a SAN
switch and thence into each side of an IBM FAStT 600 (doing H/W RAID5). The
FAStT is partitioned into two 1.6TB lumps and each FC card can see both
controllers on the FAStT (for failover).
Booting a live CD shows me that the multipath-tools package automatically
detects it has two paths and sets this up appropriately (very nice).
Now, if I wanted to stripe accesses to the FAStT down each controller I seem
to have two options:
1) Use software RAID-0 with MD. My concern then is that I don't know whether
the RAID-0 will kick in *before* the multipath and think it can stripe over 4
drives (which would be bad).
2) Add both multipath'd partitions as PV's to LVM2 and then every time we
create a new logical volume we MUST remember to specify the stripe option for
lvcreate for it to work. I also don't know how efficient or reliable it is..
Thoughts anyone ?
Christopher Samuel - (03)9925 4751 - VPAC Deputy Systems Manager
Victorian Partnership for Advanced Computing http://www.vpac.org/
Bldg 91, 110 Victoria Street, Carlton South, VIC 3053, Australia
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