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тАО02-26-2008 09:13 AM
тАО02-26-2008 09:13 AM
Disks 1 and 2 are in RAID0+1
Disks 2-8 are in RAID 5
The disks are all 68GB SAS 15Krpm
Reading and writing to the RAID 0+1 array is very quick.
Reading from the RAID 5 is very slow, writing even slower.
This problem was not there on the same setup on a DL 380 G4 with four disks in the RAID 5 array. It is also not there on any of my other DL380 G5 Server with a P400 Controller and only four disks in the RAID5 array.
The array cache is set to 100% read and 0% write.
I have the latest firmware patches on the server, raid controller and disks. The latest SSD's are installed too.
Any ideas greatly appreciated.
Solved! Go to Solution.
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тАО02-26-2008 11:26 AM
тАО02-26-2008 11:26 AM
Re: DL 380 G5 RAID 5 Slow
Advantages:
├в ┬в Has high read performance.
├в ┬в Data is not lost if one physical drive fails.
├в ┬в More drive capacity is usable than with RAID 1+0├в parity information requires only the storage
space equivalent to one physical drive.
Disadvantages:
├в ┬в Has relatively low write performance.
├в ┬в Data is lost if a second drive fails before data from the first failed drive is rebuilt.
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00729544/c00729544.pdf
The behavior you have is odd, can you run and ADU (array diagnostic utility) report and attach it?
Regards
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тАО02-26-2008 11:33 AM
тАО02-26-2008 11:33 AM
Re: DL 380 G5 RAID 5 Slow
Thanks
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тАО02-26-2008 11:43 AM
тАО02-26-2008 11:43 AM
Re: DL 380 G5 RAID 5 Slow
the Image is broke.
*.zip file must have an *.txt file inside.
regards
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тАО02-26-2008 11:46 AM
тАО02-26-2008 11:46 AM
Re: DL 380 G5 RAID 5 Slow
Here is the txt file
Regards
Chris
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тАО02-26-2008 12:11 PM
тАО02-26-2008 12:11 PM
Re: DL 380 G5 RAID 5 Slow
If you have w2k3 updating the Smart Array P400 driver to revision 6.6.2.32 improves performance to expected levels.
If w2k there is no solution as a new driver to resolve the issue.
As a workaround:
The write caching can be disabled by setting the Read/Write ratio to 100/0 on the logical drive being utilized
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тАО02-26-2008 12:34 PM
тАО02-26-2008 12:34 PM
Re: DL 380 G5 RAID 5 Slow
Thanks
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тАО02-26-2008 01:11 PM
тАО02-26-2008 01:11 PM
Re: DL 380 G5 RAID 5 Slow
About the read/write priority - you don't have a cache module,so it is just an automatic setting. With cache module you may feel better performance and you will be able to edit the read/write prio.
Kind regards,
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тАО02-27-2008 06:12 PM
тАО02-27-2008 06:12 PM
Re: DL 380 G5 RAID 5 Slow
latest driver / disable cache
getting an BBWC update would be the only
solution in case you have 256 MB BBWC right now
regards
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тАО02-27-2008 06:17 PM
тАО02-27-2008 06:17 PM
Re: DL 380 G5 RAID 5 Slow
Total Memory Size 512 MBytes