[mythtv-users] OT? Hardware Differences
R. G. Newbury
newbury at mandamus.org
Thu Apr 13 14:25:11 UTC 2006
This is a little offthread but it does affect my use of myth. And this
list has shown that it is a source of deep knownledge about linux.
I have 2 exactly similar 40G hard drives: model IC35L040AVVN07-0. Bought
the same day, same order.
Playing with hdparm I can set the master /dev/hda to use udma=5 (using
the -X69 parameter.
The slave /dev/hdb will only do udma=2.
As a result, although the cached read speeds are similar at about
730MB/s, the buffered read on hdb is 19.6MB.s versus 45 MB/s on hda
The only difference I can see is that hdb reports:
AdvancedPM=yes: unknown setting while hda reports AdvancedPM=yes:
disabled (255), and attempting to set APM on hdb gives the following
error: HDIO_DRIVE_CMD failed: Input/output error
It appears that neither APM nor acoustic management features actually
get changed/set when I use hdparm... Weird!
I can get/set the other commands/switches on the drive so this is more
than a little weird.
I want to move this drive to my mythbox and do the OS install onto it,
and use the entirety of the present 120G for recording...But the
throughput problem puts this plan in doubt. Any thoughts anyone.
Geoff
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