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 ? cheers! Chris -- 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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