[mythtv-users] Slightly OT: hdparm results

[Per Åge Sørvik]

Wood, Mike wrote:

>Guys & Girls,
>
>I'm trying to make sure my hard drive is performing optimally for MythTV so
>I just wanted to bounce these numbers off you to see if they look ok:
>
>[root at MythTV sysconfig]# hdparm -t /dev/hda
>/dev/hda:
> Timing buffered disk reads:  64 MB in  4.23 seconds = 15.13 MB/sec
>
>[root at MythTV sysconfig]# hdparm -T /dev/hda
>
>/dev/hda:
> Timing buffer-cache reads:   128 MB in  0.85 seconds =150.59 MB/sec
>
>[root at MythTV sysconfig]# hdparm /dev/hda
>/dev/hda:
> multcount    = 16 (on)
> IO_support   =  3 (32-bit w/sync)
> unmaskirq    =  1 (on)
> using_dma    =  1 (on)
> keepsettings =  0 (off)
> readonly     =  0 (off)
> readahead    =  8 (on)
> geometry     = 7297/255/63, sectors = 117231408, start = 0
>
>
>Does this look ok?  Seems strange to me that the disk reads would be sooooo
>much slower than the cache reads.  This is a 60gb/7200rpm Seagate drive in a
>RH9 machine, with a PIII 667mhz & 384mb of RAM.  Oh, and the file system is
>EXT3.
>  
>
[root at media root]# hdparm -Tt /dev/hda

/dev/hda:
 Timing buffer-cache reads:   1796 MB in  2.00 seconds = 898.00 MB/sec
 Timing buffered disk reads:   72 MB in  3.08 seconds =  23.38 MB/sec

This is on the system disc, while recording to another disc on a 40GB 
barracuda ATA IV. When idle, -t usually gives ~40MB/sec, and T gives > 
1100 MB/sec

-- 

peraage