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Very slow disk IO on SATA RAID1 Jetway NC92-330-LF
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Topic: Very slow disk IO on SATA RAID1 Jetway NC92-330-LF (Read 15699 times)
DFen
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Posts: 46
Very slow disk IO on SATA RAID1 Jetway NC92-330-LF
«
on:
Friday 25 June 2010, 02:53:39 am »
I have installed endian on a Jetway NC92-330-LF MB with two SATA HDD in software RAID1
Apart from the install being very slow, after installation I am seeing extremely slow IO on the hard disks.
hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 2392 MB in 2.00 seconds = 1195.39 MB/sec
Timing buffered disk reads: 10 MB in 3.08 seconds = 3.25 MB/sec
I was also surprised to see the disks using device hdX and not sdX!
Am I missing something here or does endian CE not fully support SATA?
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DFen
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Posts: 46
Re: Very slow disk IO on SATA RAID1 Jetway NC92-330-LF
«
Reply #1 on:
Saturday 26 June 2010, 12:17:47 am »
Just a follow up on my problems with 2.4 IO speed
I installed 2.3 on the same machine with no speed poblems at all
hdparm was showing 100MB/s Buffered read speed.
I also note that 2.3 was using kernel module libata and ata_piix as well as some scsi modules.
libata is NOT present on my copy of endian CF 2.4
Can anybody suggest where I can get additional kernel modules?
Further follow-up
============
I have upgraded using efw-upgrade and the system has reverted to being very slow!!
The disk devices are now showing as hda and hdb instead of sda and sdb (I guess having raid 1 md devices allows it to boot)
kernel mosule ata_piix is loaded but no sign of libata.
This looks to me similar to the problem found at:
h**p://bugs.endian.com/view.php?id=208
Yet more follow up 3/July/2010:
I am not at all sure where the problem lies however it appears that libata is built in to the kernel and not created as a module.
I have tried ordinary IDE disks and the speed problem remains the same.
I suspect now that this problem relates to the removal of Combined mode in kernel 2.6.22
I understand this may cause problems when the OLD ide drivers are included in the kernel along with libata drivers.
I will be the first to admit I don't understand all this, but see the following references:
Combined mode
h**p://www.mail-archive.com/linux-ide@vger.kernel.org/msg04681.html
Performance issues after combined mode removed:
h**p://forum.soft32.com/linux/Combined-mode-quirk-removal-kills-performance-ftopict345203.html
Related stuff I don't understand
h**p://forum.soft32.com/linux/PATCH-22-remove-Intel-combined-mode-quirk-ftopict341159.html
A possible fix in kernel config
h**p://linux.derkeiler.com/Mailing-Lists/Kernel/2007-07/msg08563.html
Now all I need is to try a kernel built to endian standards but without the old ide driver!!
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