[mythtv-users] Test drives with hdparm

John Drescher drescherjm at gmail.com
Thu Aug 11 14:51:35 UTC 2011


On Thu, Aug 11, 2011 at 9:52 AM, Josu Lazkano <josu.lazkano at gmail.com> wrote:
> Hello list, I am having some pauses on MythTV, I read lots of post but
> I don't know why is happening. I read this morning that it will be
> about the disk transfer rate. So I check my drive.
>
> I have a Western Digital Green 2TB drive:
>
> Model Number:       WDC WD20EARS-00MVWB0
> Serial Number:      WD-XXXXXXXXXXXX
> Firmware Revision:  51.0AB51
> Transport:          Serial, SATA 1.0a, SATA II Extensions, SATA Rev
> 2.5, SATA Rev 2.6
>
> I format with XFS this way:
>
> mkfs.xfs -l size=64m -d agcount=4 -i attr=2,maxpct=5 -L mythfs /dev/sdb1
>
> I mount it thi way:
>
> # cat /etc/fstab
> /dev/sdb1 /mnt/myth xfs noatime,nodiratime,allocsize=512m      0       0
>
> I execute the test and this is the result:
>
> # hdparm -tT /dev/sdb
>
> /dev/sdb:
>  Timing cached reads:   1326 MB in  2.00 seconds = 662.71 MB/sec

This result is more of a benchmark on ram performance. Is this an old
system? This number is very low for a modern machine.

>  Timing buffered disk reads: 368 MB in  3.00 seconds = 122.66 MB/sec

That is perfect for a 500 GB to 666 GB / platter drive made in 2010 or later.

John


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