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тАО11-26-2003 08:44 PM
тАО11-26-2003 08:44 PM
AutoRaid 12H - normal behaviour
It it fully loaded 2 Controllers, 6 x 18Gb and 4 X 4Gb disks. There is currently ~30Gb un allocated and a hot-spare configured.
We notice that if two processes are making I/O requests the performance of each is impacted. e.g. Oracle RDBMS doing writes with fbackup doing reads at the same time.
My question is
Does AutoRaid typically stripe all lvols across all phyiscal disks, or is that only when in RAID 5 Config.
Is there a way to check which RAID mode is in operation at a point in time.
Is the performance degradation normal/expected when there is two or more I/O operations happening simultaneously.
Is there any way of controlling the placing of lvols on physical disks, DBA's like to ring-fence data from indexes etc.
regards
MJW
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тАО11-27-2003 04:44 AM
тАО11-27-2003 04:44 AM
Re: AutoRaid 12H - normal behaviour
Does AutoRaid typically stripe all lvols across all phyiscal disks, or is that only when in RAID 5 Config.
Yes, *IT ALWAYS DOES*
Is there a way to check which RAID mode is in operation at a point in time.
No, there is always data on RAID-0/1 mode and on RAID-5 mode. You can only see how much data is each RAID level (amdsp)
Is the performance degradation normal/expected when there is two or more I/O operations happening simultaneously.
Don't think so, but can't explain further.
Is there any way of controlling the placing of lvols on physical disks, DBA's like to ring-fence data from indexes etc.
No, there is no way.
Regards, XGM
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тАО11-27-2003 06:59 PM
тАО11-27-2003 06:59 PM
Re: AutoRaid 12H - normal behaviour
the only thing i know about this type of array is that you can have a degradation of perf if your % of disk space allocation is greater than a certain % of the total space available because the array is automatically reconfiguring the raid level used... In this case the way to get your optimal perf back is to add some disk in the array or to put some larger disk in it...
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тАО12-01-2003 06:01 AM
тАО12-01-2003 06:01 AM
Re: AutoRaid 12H - normal behaviour
If you follow these procedures, you will find that the old 12H's actually perform quite well even under moderately heavy loads.
You have absolutely no control over have each LUN is allocated across disks and indeed this can change dynamically.
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тАО12-04-2003 03:50 AM
тАО12-04-2003 03:50 AM
Re: AutoRaid 12H - normal behaviour
as (bad) luck would have it the primary access path for most LUNs is via the controller sharing the SCSI card with the tape drive.
Would the card be able to cope with simultaneous heavy disk reads and tape writes as happens during nightly backups sometimes when they overlap the batch-run window. Or is the SCSI card unlikely to be a bottle-neck