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тАО12-23-2004 02:24 AM
тАО12-23-2004 02:24 AM
RAID cache
Hi,
there is a SCSI RAID controller (A7143) in the machine which has the cache enabled (per sautil output) however, I wonder whether this is write-back or write-through?
looking at the saconfig man page there is no way of setting the cache to WBACK or WTRHU neither for a single LUN or all.
So I am afraid the controller is only capable of WTHRU. Is that correct?
Regards,
Bernhard
there is a SCSI RAID controller (A7143) in the machine which has the cache enabled (per sautil output) however, I wonder whether this is write-back or write-through?
looking at the saconfig man page there is no way of setting the cache to WBACK or WTRHU neither for a single LUN or all.
So I am afraid the controller is only capable of WTHRU. Is that correct?
Regards,
Bernhard
3 REPLIES 3
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тАО12-23-2004 02:35 AM
тАО12-23-2004 02:35 AM
Re: RAID cache
Bernhard,
I'm not sure if this will help you but here it is:
http://docs.hp.com/en/J6369-90001/ch02s01.html
http://docs.hp.com/en/J6369-90001/J6369-90001.pdf
This describes the caching process but doesn't specifically mention WBACK or WTHRU.
HTH,
Dave
I'm not sure if this will help you but here it is:
http://docs.hp.com/en/J6369-90001/ch02s01.html
http://docs.hp.com/en/J6369-90001/J6369-90001.pdf
This describes the caching process but doesn't specifically mention WBACK or WTHRU.
HTH,
Dave
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тАО12-23-2004 03:54 AM
тАО12-23-2004 03:54 AM
Re: RAID cache
The (several) docs I found indicate a write-back cache. Some said just "256MB write cache", others just said "256MB cache", but the thing that makes me think it's pre-set to write-back is that it's ECC protected, battery-backed memory. Battery-backed is for write-back cache only - there's no point in using a battery with write-thru or read caches...
good luck,
Vince
good luck,
Vince
No matter where you go, there you are.
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тАО12-29-2004 12:02 AM
тАО12-29-2004 12:02 AM
Re: RAID cache
Vince,
that is what I assumed, however, performance on non-striped (two disk RAID1) LUNs made me doubt it.
My hope was that someone with HP internal sources of knowledge might have been able to clarify this.
Happy New Year!
Regards,
Bernhard
that is what I assumed, however, performance on non-striped (two disk RAID1) LUNs made me doubt it.
My hope was that someone with HP internal sources of knowledge might have been able to clarify this.
Happy New Year!
Regards,
Bernhard
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