topic Array Efficiency in MSA Storage

Array Efficiency

Haggisnneeps2 — Mon, 16 Jun 2008 09:27:07 GMT

Which is more efficient?
MSA1000 with 42x 300 GB drives with 1 array containing 6x 2TB logical drives (any RAID level)

OR

MSA1000 with 42x 300 GB drives with 6 arrays each containing 7x disks (=2TB)

?
answers on a postcard to.....

Re: Array Efficiency

Haggisnneeps2 — Mon, 30 Jun 2008 12:19:38 GMT

Anyone know how i can find an answer to the above?

Thx in advance

Re: Array Efficiency

Timothy Cusson — Fri, 11 Jul 2008 03:59:29 GMT

I recommend 6 RAID five array with one global hot spare. This provides 6 individual logical units, when a drive fails and is replaced, only six drives have to be rebuilt instead of all 42. Also, in case of drive failure, one hot spare can service any of the 6 arrays. The MAS100 has four SCSI buses, bus A is slots 1 to 7 of shelf one, bus B is slots 8 to 14 of shelf one, bus C is 14 slots of shelf 2 and bus D is 14 slots of shelf 3. For performance, the drives in each of 6 arrays should be spread across the four buses. The following shows drive location for 6 arrays, 1 through 6, and H for the hot spare.

Shelf One Bus A and B
1234567 1234567

Shelf Two
11223344556677

Shelf Three
1122334455667H

Regards,
Tim

Re: Array Efficiency

Haggisnneeps2 — Mon, 14 Jul 2008 07:34:57 GMT

Thanks Tim,

I never knew about the 4 buses and what you have said makes perfect sense. I've been searching for this for ages!!
GoldDust. HP should make this info available to everyone buying an MSA