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тАО05-28-2002 06:53 AM
тАО05-28-2002 06:53 AM
Vendor ID = HP
Product ID = C5447A
Array serial number = 0000000F5476
----------------------------------------------------
Overall State of Array = READY
Array configuration:
Active Hot Spare Desired = ENABLED
Auto Include = ENABLED
Auto Rebuild = ENABLED
Rebuild Priority = HIGH
Capacity Depletion Threshold = 0%
Write Working Set Interval = 8640 seconds
Language = ENGLISH
Log Full Warning = DISABLED
Volume Set Partitioning = DISABLED
Format Pattern Fill = DISABLED
Subsystem Type ID = 12
LUN Creation Limit = 8
Maximum LUN Creation Limit = 32
Array SCSI configuration:
Controller X SCSI Address = 0
Controller Y SCSI Address = 1
Write Cache = DISABLED <-
Read Cache = DISABLED <- SCSI Parity Checking = ENABLED
SDTR = ENABLED
WDTR = ENABLED
Terminator Power = ENABLED
Unit Attention = ENABLED
Disable Remote Reset = ENABLED
Secondary Controller Offline = DISABLED
Very Early Busy = DISABLED
Queue Full Threshold = 1952
Solved! Go to Solution.
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тАО05-28-2002 07:00 AM
тАО05-28-2002 07:00 AM
Re: 12h - Should R & W cache be disabled?
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тАО05-28-2002 07:01 AM
тАО05-28-2002 07:01 AM
Re: 12h - Should R & W cache be disabled?
We had an XP256 with 6 GB of cache. Cache does matter a lot because instead of reading from the slower disks with moving mechanical parts, the cache is read for frequently-accessed data. This dramatically improves performance.
Thus, I do not think that the disk array cache should be disabled.
Hope this helps. Regards.
Steven Sim Kok Leong
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тАО05-28-2002 07:03 AM
тАО05-28-2002 07:03 AM
Re: 12h - Should R & W cache be disabled?
Hope it helps ..
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тАО05-28-2002 07:15 AM
тАО05-28-2002 07:15 AM
Re: 12h - Should R & W cache be disabled?
Thanks. I saw what you mean under 'man arraymgr'. If read cache is always enabled, why would you not want to report it to the os? Write cache I can understand depending on what behavior you desire.
Personally I would think you'd want both to be reported. Is there a good reason not to?
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тАО05-28-2002 07:15 AM
тАО05-28-2002 07:15 AM
Re: 12h - Should R & W cache be disabled?
Essentially the cache should be enabled , we have a mixture of the arrays , EMC , and whenever we hard reset them it always take like 2-3 days for the array to start performing properly that always is because the cache is empty when the array starts fuctioning again. This also will definaltey effect performance considering any databse env has lots of r/w done .
Manoj Srivastava
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тАО05-28-2002 07:21 AM
тАО05-28-2002 07:21 AM
Re: 12h - Should R & W cache be disabled?
In any case, you are caching in unix whether it says you are or not.
Can't rememeber where I read that, think it was in the arraymgr man.
Later,
Bill
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тАО05-28-2002 07:59 AM
тАО05-28-2002 07:59 AM
SolutionI had to dig through my notes but I did test the setting several years ago (in HP-UX 10.20)
and found no measurable difference in performance of either setting of the read or write cache - again, it really is enabled regardless of this setting - this just changes the appearance to the outside world.
In that same section of my notes, I also found a note to myself that HP reccomends cache DISABLED for NT. I have never tested this in the NT world but in HP-UX it makes no difference though I will admit I have not tested it in HP-UX 11.x. That might be a project for you.
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тАО05-28-2002 09:54 AM
тАО05-28-2002 09:54 AM
Re: 12h - Should R & W cache be disabled?
The general consensus is the settings will have no effect.