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тАО10-07-2005 04:05 AM
тАО10-07-2005 04:05 AM
I'm getting very poor performance on the disk drives, less than 3 MB per second.
I ran "hdparm /dev/hda" and notice that "using_dma" is not set and cannot be set (hdparm -d1 /dev/hda) with error "Operation not permitted".
This server comes up as a supported system on the HP web which seems odd to me if it's performing so badly.
Solved! Go to Solution.
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тАО10-07-2005 07:00 PM
тАО10-07-2005 07:00 PM
Re: DL140 G2 SATA disk speed
Do you use SATA harddrive? or SCSI harddrive?
I suggest you use 2 method to benchmark i/o performance.
1, perform command "time dd if=/dev/zero of=/aaa bs=1024k count=3000", in the same time and another console perform command "vmstat 1 10000" to gather infomation.
2, perform command "time tar cf directory(i use redhat 4 discs)" to have a try. And in the same time and another console perform command "vmstat 1 10000" to gather infomation.
Put on below result.
NiCK
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тАО10-14-2005 06:34 AM
тАО10-14-2005 06:34 AM
Re: DL140 G2 SATA disk speed
This seem to be related to the fact that the linux kernel recognise the drive as an old Parallel-ATA drive.
My guess is that there is an emulation layer in HP's bios that should be removed so that the linux kernel recognise the drive as a SATA one.
You can see wether you are using the old PATA driver if your device is named /dev/hda. It will be /dev/sda if you are using the SATA driver.
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тАО10-18-2005 03:35 AM
тАО10-18-2005 03:35 AM
Re: DL140 G2 SATA disk speed
The clock seems to stop now and then, the hard disks become unavailable for extended periods when handling high IO loads.
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тАО11-06-2005 01:31 AM
тАО11-06-2005 01:31 AM
Re: DL140 G2 SATA disk speed
so if you have a cd driver inside your hd is sda and/or sdb if you dont have they becames hda/hdb .
The problem is only bios emulation so let hp repair this stupid problem!!!!!
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тАО11-06-2005 12:05 PM
тАО11-06-2005 12:05 PM
Re: DL140 G2 SATA disk speed
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=172301
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тАО11-30-2005 12:09 AM
тАО11-30-2005 12:09 AM
SolutionChange...
kernel /vmlinuz-2.6.9-22.0.1.EL ro root=/dev/VolGroup00/LogVol00
...to...
kernel /vmlinuz-2.6.9-22.0.1.EL ro root=/dev/VolGroup00/LogVol00 ide0=noprobe ide1=noprobe
...
Subsequent kernel installs will also get these additional parameters, so this doesn't need to be redone later.
When this change has been made and the system rebooted, your hard disk will now be /dev/sda not /dev/hda and performance will be a lot faster.
This doesn't affect the DL145 G2, only the DL140 G2...
I hope this helps...
Dan
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тАО12-07-2005 07:28 AM
тАО12-07-2005 07:28 AM
Re: DL140 G2 SATA disk speed
This is definitely HP problem.
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тАО09-12-2006 07:22 AM
тАО09-12-2006 07:22 AM
Re: DL140 G2 SATA disk speed
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тАО09-17-2006 11:11 PM
тАО09-17-2006 11:11 PM
Re: DL140 G2 SATA disk speed
ide0=noprobe ide1=noprobe
I don't agree that this is a HP problem but a kernel problem, the kernel is detecting them as non-SATA disks.