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тАО08-13-2004 06:27 AM
тАО08-13-2004 06:27 AM
Re: ML330 slow with IDE Raid 1
I've ran into the same slow performance issues as well with my DL320 in an IDE RAID1 configuration. It took a long time to install Windows 2003 server and when I measured the performance I was also getting around 5-6MB/s write performance.
I tried enabling the write-cache and it improved the write performance dramatically. I was getting about 35-40MB/s with the write cache on. It appears the server is nearly unusable without the write-cache enabled...
I haven't had a chance to test, but do SCSI drives also take similiar performance hits when write-cache is disabled? I might try this on one of my servers the next time I get a chance.
For now I've decided to keep the cache enabled and risk the data loss...that's better than having an unusable server in my opinion.
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тАО08-16-2004 01:58 AM
тАО08-16-2004 01:58 AM
Re: ML330 slow with IDE Raid 1
We ended up buying extra IDE Raid controllers for our ML330 servers and plugged in the 200GB disks we bought. Performance is OK now (like we expected it to be in the first place).
To see what problems I talk about, have a look at the two pictures I attached to this message. The "lsi.jpg" shows the disk transfer rate (read/write) in Raid1+0 mode using the onboard LSI controller and four of the original 40GB disks, the "promise.jpg" shows the performance using a Promise SX4000 controller with four off-the-shelf 200GB IDE disks (Raid5). y axis is file size in KB, the numbers to the right are speed in KB/s.
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тАО12-23-2004 06:03 AM
тАО12-23-2004 06:03 AM
Re: ML330 slow with IDE Raid 1
I did some tests while running on the latest PSP and ROM (as of 12/23/04), seems that performance is acceptable with the write cache on, not acceptable at all with it off.
See spreadsheet, I also compared drives on/off the same IDE channel. The best combination is write cache on with the 2 drives on the same channel.
Ben
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тАО12-23-2004 12:19 PM
тАО12-23-2004 12:19 PM
Re: ML330 slow with IDE Raid 1
I FOUND A SOLUTION for the ML330 slow disk transfers !!!
I now get up to 8x faster transfers across the network ON REAL applications, and about x2 or x3 on performance tests.
SOLUTION: run Windows Updates, and install the updated disk driver from there. Do not install/reinstall any driver from HP. Reboot, and zooom !!!!
If you don't have Internet connectivity, just download the update from another PC, and move it/run it on the server.
I haven't checked that for the DL320, but I have installed the cheap Adaptec 1210SA card and a couple of 250GB SATA disks in most of my servers, so the on-board performance becvomes irrelevant.
You could keep write cache on if you want to get an additional boost, but I wouldn't recommend it, and anyway with the new driver, you have a pretty decent performance now, so the best trade-off of performance and safety is to update the driver and disable the write cache. If you have reliable power and setup, you can still disable write cache at your own risks.
Just thought this might be good news for you guys for Christmas !!!
Merry Christmas and Happy Holidays!
Max
P.S.: I actually did some other changes in the BIOS at the same time, but I believe the most relevant came from the new driver. Let me know if this doesn't work, and I'll post my BIOS changes, probably next year! ;-)
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тАО10-12-2005 06:03 AM
тАО10-12-2005 06:03 AM
Re: ML330 slow with IDE Raid 1
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