topic Re: 12H AutoRaid in Disk Enclosures

12H AutoRaid

Nobody's Hero — Fri, 02 Aug 2002 17:09:47 GMT

Is there a way to turn off AutoRaid on the 12H's? I believe its raid or forget it. Is that true?

Re: 12H AutoRaid

Christopher McCray_1 — Fri, 02 Aug 2002 17:11:19 GMT

Hello,

Yes, the name says it all.

Chris

Re: 12H AutoRaid

Hai Nguyen_1 — Fri, 02 Aug 2002 17:14:55 GMT

Robert,

I am using 12H auto in production. No, there is no way to turn off RAID. The RAID will be either 0+1 or 5.

Hai

Re: 12H AutoRaid

A. Clay Stephenson — Fri, 02 Aug 2002 17:15:01 GMT

In a word, no. They only control you have is to limit the size of the allocated LUN's. If you keep it at about 50% capacity then it's all RAID 1/0; at allocated capacity levels about approximately that point an increasingly large fraction (but never greater than 0.9) is converted to RAID5.

You have absolutely no control over the physical placement of the data as fas as assigning a given LUN to a certain group of disks.

Re: 12H AutoRaid

Christopher McCray_1 — Fri, 02 Aug 2002 17:17:28 GMT

Just for clarification, my "yes" was to the second statement/question.

Chris

Re: 12H AutoRaid

S.K. Chan — Fri, 02 Aug 2002 17:22:28 GMT

You do not have control over how the RAID is setup on a 12H. The only control you have is how much space you want to allocate for your LUNS. You might also want to consider a dual path setup (2 adapter cards on the server, one going to X channel and the other to Y).

Re: 12H AutoRaid

Sajid_1 — Mon, 05 Aug 2002 00:41:33 GMT

hello,

I faced this issue little while ago when we needed more space and no redundancy of data! We were using RAID-1 (mirroring) and the best way we could use that converting all to RAID-5. We got around 85% of the disk space available for use instead of 50%. You should take a full backup of the data before you do this and then reconfigure it from scratch.

We didn't try, but if you want you can consider doing a RAID-0 (striping) on disks and set different LUNs and see the difference.

gl,

Re: 12H AutoRaid

Bill McNAMARA_1 — Mon, 05 Aug 2002 07:49:58 GMT

Yup, it's just raid!
You can however, take out the disks from their enclosures and disk bays and reseat them in a JBOD disk enclosure and disk bay, but the autoraid controllers themselves cannot be programmed to do anything but raid.

Later,
Bill

Re: 12H AutoRaid

James Lakin — Wed, 07 Aug 2002 00:05:35 GMT

I am piggy-backing off this thread...

2 Nodes connecting to 2 Controllers on the 12H.

I've read that only 1 controller is ever "really" active at 1 time. You can not benefit from the both X and Y Controllers simutaneously (i.e. No load balancing of throughput). I have also read many threads to the contrary of this. Help on this one...

I am experiencing performance issues and I believe I have an issue with the AUTORAID...

Controller X=1
Controller Y=0

All my LV's are going through the Y Controller but Y is NOT the Primary. Arraydsp -c arrayname shows Y as false for primary. X is the primary.

I want to do an arraymgr -c Y to set Controller Y as the primary. Will this work?