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тАО02-19-2002 11:53 PM
тАО02-19-2002 11:53 PM
Striping across 2 Autoraids (12H) ?
last weekend i reconfigured our 12H using 2 striped LUNs each VG (a good tip from A. Clay Stephenson). Performance is nearly 20% better during backup. Watching diskactivity using glance i found one application causing heavy traffic on the 12H. I've got a second 12H i still have to configure in the same Cluster, conneted to the same nodes. What do you think about creating a VG striping 2 LUNs on the 1st 12H and 2 LUNs on the 2nd 12H ?
Thanks in advance
Lothar
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тАО02-20-2002 01:04 AM
тАО02-20-2002 01:04 AM
Re: Striping across 2 Autoraids (12H) ?
I think you cannot stripe across 2 AutoRAIDs in the sense of striping across 24 disks. Although you can connect 2 AutoRAIDs in the same SCSI chain, they will be addressed as seperate machines, not one.
You can create a second dual LUN on the second AutoRAID though, providing a mirror to the second AutoRAID.
HTH,
Vince
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тАО02-20-2002 01:17 AM
тАО02-20-2002 01:17 AM
Re: Striping across 2 Autoraids (12H) ?
where is my fault? I thought, I could vgextend an existigng VG containing 2 logical Disks on 12H#1 with 2 logical disks LUN on 12H#2. The i would create (with SAM) one or more LV in that VG with 4 stripes each ?
Lothar
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тАО02-20-2002 02:28 AM
тАО02-20-2002 02:28 AM
Re: Striping across 2 Autoraids (12H) ?
You could create another lun on the AutoRAID #2 and then vgextend the lun on the first AutoRAID to the second, sure.
I didn't understand the 4 stripes each thing though. Can you specify a bit more?
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тАО02-20-2002 02:54 AM
тАО02-20-2002 02:54 AM
Re: Striping across 2 Autoraids (12H) ?
the 12Hs have 2 controllers each. The Idea is using both controllers best as possible.
Therefore i create 2 LUNs each VG, 1st with prim.controller X and altern.controller Y, 2nd with prim.controller Y and alternate X. Striping across this 2 LUNs increases performance. Striping across more LUNs on the same 12H has no effect in performance, because the same controllers would be used. Increasing the amount of controllers in a 12H to more than 2 is not possible. But for reducing the traffic on each controller i have to add controllers. So the idea is adding controllers by using additional LUNs on another 12H. In my environment i cannot test this, because the 1st 12H has no more free LUNs and the 2nd isn't integrated yet.
Lothar
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тАО02-20-2002 03:15 AM
тАО02-20-2002 03:15 AM
Re: Striping across 2 Autoraids (12H) ?
Yes you can do that I think. You need an additional 2 controllers in your host for maximum high availibility.
HTH,
Vince
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тАО02-20-2002 04:13 AM
тАО02-20-2002 04:13 AM
Re: Striping across 2 Autoraids (12H) ?
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тАО02-20-2002 04:24 AM
тАО02-20-2002 04:24 AM
Re: Striping across 2 Autoraids (12H) ?
1. Amount of available RAID 0/1.
The more RAID 0/1 space available, the better the disk array performance.
Enabling Hot spare will allow you to have more RAID 0/1 space.
2. Proper disk module installation.
Installing the disk modules in the correct slots in the enclosure distributes the disks across the internal SCSI busses and balances the I/O load properly. Disk modules should be installed from left-to-right, top-to-bottom.
3. Keep the disk capacity small ??? Having twelve disks with smaller capacities will improve the performance as compared to having twelve disks with larger capacities.
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тАО02-20-2002 04:35 PM
тАО02-20-2002 04:35 PM
Re: Striping across 2 Autoraids (12H) ?
Good Luck.
Steve
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тАО02-21-2002 12:56 AM
тАО02-21-2002 12:56 AM
Re: Striping across 2 Autoraids (12H) ?
i hoped that anyone would have expieriences in striping across raids.
But your answers make think it's worth a try.
Insu, your 3rd rule i cannot beleive in, 12 disks are 12 disks, but i think 12*18GB are faster than 6*36GB. Is that what you meant ?
Steve, i think, if STRIPE-configuration across several raids is possible, then data really MUST be distributed to the several raids in parallel and not in sequence, that's the sense of striping.
Thanks again
Lothar