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тАО10-25-2000 06:30 AM
тАО10-25-2000 06:30 AM
Auto Raid 12H Performance Questions
I was wandering if this was really a problem with Glance Plus or if I could be having disk bottleneck problems?
On one hand I am not concerned because the users are not reporting any problems, but on the other hand I am concerned that this could be a problem down the road.
Thanks in advance for your help.
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тАО10-25-2000 06:44 AM
тАО10-25-2000 06:44 AM
Re: Auto Raid 12H Performance Questions
for performance issues see:
http://www.hp.com/cposupport/information_storage/support_doc/lpg75003.html
Regards
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тАО10-26-2000 07:03 AM
тАО10-26-2000 07:03 AM
Re: Auto Raid 12H Performance Questions
I have two controllers in the AutoRaid attached to 2 different SCSI buses so I have dual paths to the disk arrays. I then split up the array into 4 LUNs. I have the primary path on 2 of the LUNs set to SCSI Bus 1 and the primary path on the other 2 LUNs set to Scsi Bus 2. I then created the VG on the array using those 4 LUNs so that the I/O was split between the 2 different SCSI Buses and the 2 controllers on the array. It helped. The only problem with doing that is that it required that the data be backed up and the 12H totally reconfigured and the data restored.
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тАО11-01-2000 01:40 AM
тАО11-01-2000 01:40 AM
Re: Auto Raid 12H Performance Questions
lvcreate -i2 -I64 -L 10000 -n lveg /dev/vgeg
This tells it to stripe your logical volume across the 2 luns so it sends 64k chunks down each controller to your logical volume.
You can check it by doing an lvdisplay of the lv and it'll show you it striped across the 2 luns.
Of course you will need to backup your data first.
Patrick probably dilikes the AutoRAID because he's a DB and prefers to know what spindles his logs and dbspaces are going onto. The AutoRAID takes this mgnt overhead from u and if setup correctly it can be very performant, it u don't like that u should buy jbod.
Hope this helps, Paul
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тАО11-02-2000 02:24 PM
тАО11-02-2000 02:24 PM
Re: Auto Raid 12H Performance Questions
I am a SysAdmin, not a DBA. The reason I dislike the 12H arrays is because of the architecture. The fact that the disk drives in the array are SE scsi and controllers are FWD scsi is crazy. Granted, with haveing I/O going to multiple disks from the controllers this shouldn't be a problem, but to me it's just asking for trouble.
Unfortunately, to me anyway, I inherited the 12H's when I took over the Sys Admin job on these systems. All the disk I have bought for these systems since then has been JBOD.