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тАО02-19-2004 12:44 AM
тАО02-19-2004 12:44 AM
Re : Autoraid 12H
Can anyone tell me if I can add another two harddisk to my existing Autoraid 12h with size 18GB each. Existing there is 8 x 4GB running with one controller. And supposing if I want to add another controller, how can I load balance the Autoraid between all the disk ???
Please advice??
Regards
Vincent
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тАО02-19-2004 01:54 AM
тАО02-19-2004 01:54 AM
Re: Re : Autoraid 12H
There is absolutely no way to control how the disks are used or balanced; that is entirely automatic.
What you can do is split the i/o across both external SCSI buses; you should also try to limit the allocated space (LUN's) on the array to 50% or so. If you do that, the AutoRAID stores everything in RAID 1/0 rather that RAID5.
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тАО02-19-2004 01:57 AM
тАО02-19-2004 01:57 AM
Re: Re : Autoraid 12H
What I don't remember is whether thats a manual operation or not.
I'd back up all the data on that array prior to doing anything, especially switching disks from one controller to the next.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО02-19-2004 02:07 AM
тАО02-19-2004 02:07 AM
Re: Re : Autoraid 12H
I should add that you will see significanly better performance if you add 3 18GB disks rather than 2 and 4 disks would be better still. The more disks in an AutoRAID, the better it performs.
If yoy want the best possible performance from your AutoRAID, follow these steps:
1) Fully populate your array with disks.
2) Allocate as little space as possible as LUN's.
3) When creating a volume group, assign two LUN's of equal size to the VG. LUNA's primary path should be through Controller X (alternate Y) and LUNB's primary SCSI path should be through Controller Y (alternate X).
These controllers should be on separate SCSI buses.
4) Each LVOL in this VG should be striped across both LUN's --- typically in 64K chunks.
This method will allow you to fully utilize both external SCSI paths and all four internal SCSI paths.
You can also replace your 4GB disks with larger modules. As long as you do them "one at a time" and wait until the LOad Balance is complete there is no reason to shutdown.
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тАО02-19-2004 02:48 AM
тАО02-19-2004 02:48 AM
Re: Re : Autoraid 12H
lots of information can be found at http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?locale=en_US&prodTypeId=12169&prodSeriesId=33733&prodSeriesName=hp+surestore+disk+array+12h
Check the User's and Service Manual. It will tell you something how it handles disks.
JP.
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тАО02-20-2004 04:02 AM
тАО02-20-2004 04:02 AM