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тАО12-28-2007 07:44 AM
тАО12-28-2007 07:44 AM
ML350 G5 + E200i performance issue
I'm facing big I/O performance issue with the following configuration :
ML350 G5, E200i smart array with 4 750GB 7200 RPM SATA disks.
3 disks are used in RAID5 configuration, the last one is not used at the moment.
Firmware updates have been applied using the 7.91 firmware CD from HP.
OS is an up to date CENTOS 5 update 1.
Filesystem is ext3 on top of LVM.
Write cache and array acceleration are enabled.
cache ratio is 25% read/75% write.
Reading from disk is OK (~ 90 MB/s), however writing is awfully slow (~ 10 MB/s) and iowait is ~ 100%, thus the machine is nearly unusable
Upgrading to the latest e200 driver version (3.6.18) from hp website does not show any improvement.
To insure that the performance issue was not related to RAID 5, I performed several tests on the 4th drive alone (i.e. RAID0) :
- dd directly to the device.
- dd on an ext3 filesystem.
- dd on an ext3 on top of LVM.
All tests gave the same result : ~ 10 MB/s
The same test on my laptop with a 7200 RPM SATA disk gives me ~30 MB/s
Does anybody have a clue on what is wrong here ?
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тАО12-28-2007 05:53 PM
тАО12-28-2007 05:53 PM
Re: ML350 G5 + E200i performance issue
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тАО01-01-2008 07:56 AM
тАО01-01-2008 07:56 AM
Re: ML350 G5 + E200i performance issue
If you read the previous topics, describing low performance, you understand, that at this moment there is no solution for that issue.
If you use SATA drives with E200i or even in other conditions you experience very low disk performance. This is because the HP engineers think, that disabling INTERNAL drive cache of SATA drives is a good idea, which provides reliability.
On e200i there is no way to enable that cache, so SATA drives not usable at working solutions, only as a expensive toys. On P400 controller this problem solvable - you can enable INTERNAL drive cache on SATA.
I don't deeply know how SATA drive's software operates, but I think that flushing of INTERNAL drive cache syncronized with spindle rotation at least. Disabling the internal SATA drive cache realy stucks all the drive's operation.
2 HP
Hey HP, I'm tired of telling to you at this forum about YOUR PROBLEMS. I don't have another ways to heat your brains. Do it something about performance of SATA on E200i. Your marketing of low and high solutions gives you another results. Your representatives at my region nothing can do. I'm slowly hate you firmi. 15k of $$ is expemsive for my business. Don't think about airplanes, think about peoples, that uses your technicsa and have many hours of useless "trahanie" with your servers, demonstrating unpredictable behaviour.
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тАО01-04-2008 05:10 AM
тАО01-04-2008 05:10 AM
Re: ML350 G5 + E200i performance issue
As explained in my initial post, I've already applied the firmware maintenance CD, so all components are up to date.
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тАО01-04-2008 05:27 AM
тАО01-04-2008 05:27 AM
Re: ML350 G5 + E200i performance issue
Thanks for your answer.
I agree with you that HP should at least give the customer the choice to enable or disable the internal drive cache.
In the meantime it seems that I have no solution except going for a P400 RAID card since the machine is barely usable in this configuration.
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тАО01-23-2008 07:12 AM
тАО01-23-2008 07:12 AM
Re: ML350 G5 + E200i performance issue
Performances are now up to 30 MB/s in RAID 5 and 60 MB/s in RAID 1+0 and RAID 0.
Regards.
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тАО01-23-2008 07:21 AM
тАО01-23-2008 07:21 AM
Re: ML350 G5 + E200i performance issue
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тАО01-23-2008 11:57 AM
тАО01-23-2008 11:57 AM
Re: ML350 G5 + E200i performance issue
"The installation procedure did not complete successfully. An error occurred during the setup process.
You may look at the setup log file for more details if desired.
Additional Information:
The Array Controller ROM flash failed for the following device:
Slot 0, Product ID 0x103C3211, Version 1.66
Press the 'Close' button to exit Setup."
What's a *uck ? What I have to do. Sorry author, that thread is closed, but proplem isn't solved. Which log I have to view. Exact path please... On russ I will say "bla..."
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тАО01-23-2008 12:47 PM
тАО01-23-2008 12:47 PM
Re: ML350 G5 + E200i performance issue
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тАО03-28-2008 02:35 AM
тАО03-28-2008 02:35 AM
Re: ML350 G5 + E200i performance issue
I have upgraded e200i to the latest firmware 1.72, latest e200i driver (6.12.0.32), latest SATA disks firmware, but nothing seems to changed - write performance on RAID 5, 4x500GB 7200 RPM lasts maximum 20-23 MB/s.
Maybe i must enable write cache manual? How can i do that on Windows 2003 server?