[mythtv-users] Terrible drive performance on frontend

James Pifer jep at obrien-pifer.com
Wed Nov 1 14:29:19 UTC 2006


I rebuilt a machine using FC5 on four drives of the exact same type. The
drives are setup as two LVMs. I use the second LVM as a nightly backup
of the first using rsync (poor man's mirror in a way...)

Anyway, when playing Recordings the playback is choppy. I used to run
FC3 on this system with different drives and never had issues. Upon
further review I found the following:

___________________________________________________________________
# hdparm -i /dev/hda;hdparm -tT /dev/hda

/dev/hda:

 Model=WDC WD1600JB-00GVA0, FwRev=08.02D08, SerialNo=WD-WMAL92166621
 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
 RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=74
 BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
 CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=268435455
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: Unspecified:  ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6

 * signifies the current active mode


/dev/hda:
 Timing cached reads:   328 MB in  2.00 seconds = 163.76 MB/sec
 Timing buffered disk reads:  154 MB in  3.05 seconds =  50.51 MB/sec
_______________________________________________________________________



I am using 80 pin cables and I've run the following command on all the
drives:
hdparm -u1 -c1 -d1 /dev/hda

Two things I've noticed when comparing the output above to other
machines:
AdvancedPM=no
Drive conforms to: Unspecified:

Why would the system not recognize what the drives conform to?
Any suggestions with this?

Thanks,
James



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