Re: [CentOS] Very slow disk performance on CentOS 4.5 [solved]

2007-08-31 Thread Alfred von Campe
Well most desktop motherboards these days provide for 2 SATA devices and 2 emulated PATA devices. Though the emulated PATA devices will probably end up using PIO instead of DMA for transfers which is slow and processor intensive, so these are usually reserved for optical drives, which are slow.

RE: [CentOS] Very slow disk performance on CentOS 4.5 [solved]

2007-08-31 Thread Ross S. W. Walker
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alfred von Campe > > > Yes, I was going to say this too, make sure the SATA settings in the > > BIOS are all set to SATA operation and not "legacy", then you should > > see /dev/sda and /dev/sdb and all DMA, IO size, NCQ and multiple

Re: [CentOS] Very slow disk performance on CentOS 4.5 [solved]

2007-08-31 Thread Alfred von Campe
Yes, I was going to say this too, make sure the SATA settings in the BIOS are all set to SATA operation and not "legacy", then you should see /dev/sda and /dev/sdb and all DMA, IO size, NCQ and multiple sector settings will be properly negotiated at start-up. I bit the bullet and rebooted my

RE: [CentOS] Very slow disk performance on CentOS 4.5

2007-08-31 Thread Ross S. W. Walker
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bart Schaefer > > On 8/31/07, Alfred von Campe <[EMAIL PROTECTED]> wrote: > > The are all SATA drives (2 HDDs and 2 optical drives). But because > > there are two controllers, one of the HDDs shows up as /dev/hda and > > the other as

Re: [CentOS] Very slow disk performance on CentOS 4.5

2007-08-31 Thread Bart Schaefer
On 8/31/07, Alfred von Campe <[EMAIL PROTECTED]> wrote: > The are all SATA drives (2 HDDs and 2 optical drives). But because > there are two controllers, one of the HDDs shows up as /dev/hda and > the other as /dev/sda. If it's showing up as /dev/hda, it's probably being accessed in legacy IDE co

Re: [CentOS] Very slow disk performance on CentOS 4.5

2007-08-31 Thread Alfred von Campe
On Aug 31, 2007, at 12:20, Ross S. W. Walker wrote: See if the drive supports DMA and 32-bit IO and if it does set it with hdparm (put in the hdparm.conf to do so across reboots). I guess that is what I am asking. How do I do set the appropriate parameters with hdparm? And look into gett

RE: [CentOS] Very slow disk performance on CentOS 4.5

2007-08-31 Thread Ross S. W. Walker
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alfred von Campe > > I recently moved my CentOS 4.5 disk from a Lenovo ThinkCentre M52 > (3.2 GHz Pentium 4) to a Lenovo ThinkCentre M55 (3.4 GHz Core 2 > Duo). I had to install the SMP kernel, but other than that > everything

[CentOS] Very slow disk performance on CentOS 4.5

2007-08-31 Thread Alfred von Campe
I recently moved my CentOS 4.5 disk from a Lenovo ThinkCentre M52 (3.2 GHz Pentium 4) to a Lenovo ThinkCentre M55 (3.4 GHz Core 2 Duo). I had to install the SMP kernel, but other than that everything just worked. I did have an issue with accidentally initializing my /boot partition, but t