[mythtv-users] Disk I/O problems?
Larry Finger
Larry.Finger at lwfinger.net
Fri Aug 22 17:42:07 UTC 2014
On 08/22/2014 11:46 AM, Lindsay Mathieson wrote:
> Since upgrading to 0.27.3 I've been having bad problems with playback stutter
> and failures.
>
>
> hdparm on my disks seem somewhat slow:
>
> sudo hdparm -tT /dev/sda
>
> /dev/sda:
> Timing cached reads: 2134 MB in 2.00 seconds = 1067.96 MB/sec
> Timing buffered disk reads: 232 MB in 3.01 seconds = 77.01 MB/sec
>
> Is this normal for WD 1TB Greens? unfortunately I don't know what they were in
> the past :)
For my three 1TB disks, I get
finger at desktop:~> sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 1942 MB in 2.00 seconds = 971.63 MB/sec
Timing buffered disk reads: 500 MB in 3.00 seconds = 166.62 MB/sec
finger at desktop:~> sudo hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 1962 MB in 2.00 seconds = 980.90 MB/sec
Timing buffered disk reads: 260 MB in 3.01 seconds = 86.52 MB/sec
finger at desktop:~> sudo hdparm -tT /dev/sdc
/dev/sdc:
Timing cached reads: 1972 MB in 2.00 seconds = 986.71 MB/sec
Timing buffered disk reads: 458 MB in 3.01 seconds = 152.33 MB/sec
My drives are
/dev/sda:
Model Family: Seagate Barracuda 7200.14 (AF)
Device Model: ST1000DM003-1CH162
/dev/sdb:
Model Family: Western Digital Caviar Green
Device Model: WDC WD10EADS-00L5B1
/dev/sdc:
Model Family: Seagate Barracuda 7200.14 (AF)
Device Model: ST1000DM003-9YN162
The buffered reads from the Seagates are nearly twice as fast as the WD. As far
as I know, my system is OK.
Larry
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