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тАО06-12-2006 04:23 AM
тАО06-12-2006 04:23 AM
poor scsi perfomance on ML370 G4 while indexing
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тАО06-12-2006 05:42 PM
тАО06-12-2006 05:42 PM
Re: poor scsi perfomance on ML370 G4 while indexing
I suspect that you're using a SmartArray controller without the Battery Backed Write Cache option.
Without the BBWC, performance of SmartArray controllers can be very slow.
Cheers,
Rob
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тАО06-12-2006 06:29 PM
тАО06-12-2006 06:29 PM
Re: poor scsi perfomance on ML370 G4 while indexing
I use Smartarray 642, can you tell me more about backed battery write option ?
Tx
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тАО06-12-2006 07:00 PM
тАО06-12-2006 07:00 PM
Re: poor scsi perfomance on ML370 G4 while indexing
Usually SA642 come with 64MB of BBWC, you can upgrate to Max (192MB) with this kit
BBWC Enabler Options
128-MB BBWC (Battery-Backed Write Cache) Enabler
351580-B21
Regard,
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тАО06-12-2006 07:03 PM
тАО06-12-2006 07:03 PM
Re: poor scsi perfomance on ML370 G4 while indexing
SmartArray 642 have 64 Mb read cache memory
and you can add 64 Mb or 128 Mb Battery Backed Write Cache
http://h18004.www1.hp.com/products/servers/proliantstorage/arraycontrollers/smartarray642/index.html?jumpid=reg_R1002_USEN
"The 64MB and 128MB BBWC (Battery Backed Write Cache) Enabler upgrade allows the SA-642 controller an option to add transportable BBWC for improved controller performance and increases the total controller memory, up to 192MB."
http://h18004.www1.hp.com/products/quickspecs/12069_div/12069_div.html
PROBABLY write cache will improve performance, I am not sure if you will have significant improvement in database indexing
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тАО06-12-2006 09:03 PM
тАО06-12-2006 09:03 PM
Re: poor scsi perfomance on ML370 G4 while indexing
RAID5 has very large performance overhead - especially for random writes (e.g. databases). When you do not have write chache it could be much slower than a single drive.
You will benefit a lot from adding one more HDD and migrating to RAID10 in the terms of performance!
Still adding BBWC seems to be almost a necessity if you are after a decent speed.
Rgds.
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тАО06-13-2006 01:25 PM
тАО06-13-2006 01:25 PM
Re: poor scsi perfomance on ML370 G4 while indexing
Is it BBWC enable by default ? or we must enable it ? When I look the SA642 there's no memory at all at the slot. Is it sale saparetly ?
I already tried a single disk (SCSI) but still much slower compare with single disk (IDE). How come ?
Regards,
Robinsolo