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sobers_2002
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Joined: 16 Mar 2004
Posts: 1128
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 Posted: Mon Oct 10, 2005 10:10 am Post subject: hard drive is giving pathetic performance |
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Hi
i don't understand why this is happening, but this seagate drive is performing REAL badly. here are some of the outputs/settings
| Code: | hdparm -t /dev/hdb
/dev/hdb:
Timing buffered disk reads: 6 MB in 3.16 seconds = 1.90 MB/sec
# hdparm -i /dev/hdb
/dev/hdb:
Model=ST340810A, FwRev=3.39, SerialNo=6FB0XR0Y
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78165360
IORDY=on/off, tPIO={min:240,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=yes: unknown setting WriteCache=enabled
Drive conforms to: device does not report version:
* signifies the current active mode
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now everything seems fine here, and the smart drive test says no problems either. The other drive /dev/hda is also a seagate drive and it gives 55.15 MB/sec!!
some1 plz tell me what could be wrong!!
thankx
Saurabh
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Cintra
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Joined: 03 Apr 2004
Posts: 2111
Location: Norway
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| Posted: Mon Oct 10, 2005 10:29 am Post subject: |
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and hdparm -d /dev/hdb ?
do the individual partitions (hdparm -t /dev/hdbx) show the same poor performance?
mvh
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sobers_2002
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| Posted: Mon Oct 10, 2005 12:27 pm Post subject: |
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i posted both the things above, dma is enabled and is in udma5 mode
and the other drive is giving 55mb/s performance
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widan
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Joined: 07 Jun 2005
Posts: 1512
Location: Paris, France
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| Posted: Mon Oct 10, 2005 6:54 pm Post subject: |
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| sobers_2002 wrote: | | i posted both the things above, dma is enabled and is in udma5 mode |
I really doubt DMA is in use given the speed. udma5 in "hdparm -i" is not enough... Check that DMA is really enabled with "hdparm /dev/hdb", and looking at the using_dma line. |
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Janne Pikkarainen
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Location: Helsinki, Finland
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| Posted: Mon Oct 10, 2005 7:18 pm Post subject: |
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I would also check the physical IDE cable. Also maybe some other peripheral connected to same bus is causing some kind of interference? Not that it should nowadays happen...
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sobers_2002
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Joined: 16 Mar 2004
Posts: 1128
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| Posted: Tue Oct 11, 2005 2:43 am Post subject: |
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| widan wrote: | | sobers_2002 wrote: | | i posted both the things above, dma is enabled and is in udma5 mode |
I really doubt DMA is in use given the speed. udma5 in "hdparm -i" is not enough... Check that DMA is really enabled with "hdparm /dev/hdb", and looking at the using_dma line. |
| Quote: | hdparm /dev/hdb
/dev/hdb:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 77545/16/63, sectors = 78165360, start = 0
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so the dma is enabled.
@ Janne : i'll try putting it on a separate cable and try, but it seems unlikely as both drives are of seagate and the other one is performing pretty well.
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UBek
n00b
Joined: 07 Aug 2005
Posts: 56
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| Posted: Tue Oct 11, 2005 9:53 am Post subject: the same problem |
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| i had the same problem. my seagate transfer rate is 20-30 mb and i dont know what is wrong , i think that there is badly written for seagate's i replayed a post from mamy people whit this same proble .... ZONK!!! |
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Cintra
Advocate
Joined: 03 Apr 2004
Posts: 2111
Location: Norway
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| Posted: Tue Oct 11, 2005 6:31 pm Post subject: |
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| sobers_2002 wrote: | i posted both the things above, dma is enabled and is in udma5 mode
and the other drive is giving 55mb/s performance |
If you read my post carefully you would see I said 'partitions', by which I mean hdb3, hdb7, etc, e.g.
| Code: | | hdparm -t /dev/hdb3 |
A previous thread I was involved in had a poor hdb result because a single partition was pulling things down... if you have something similar it might give you a lead!
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Janne Pikkarainen
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| Posted: Tue Oct 11, 2005 6:38 pm Post subject: |
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Outer tracks of the disk platters gives better performance than the inner ones, thus performance depends where the partition is physically located. Speed difference between outer and inner tracks should not be very high, though.
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sobers_2002
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Gentree
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Joined: 01 Jul 2003
Posts: 5350
Location: France, Old Europe
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| Posted: Wed Oct 12, 2005 10:46 pm Post subject: |
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| sobers_2002 wrote: | | there is a single partition on the disk.. so now what doido?? |
RTFM?
| man hdparm wrote: |
-i Display the identification info that was obtained from the drive
at boot time, if available. This is a feature of modern IDE
drives, and may not be supported by older devices. The data
returned may or may not be current, depending on activity since
booting the system. However, the current multiple sector mode
count is always shown. For a more detailed interpretation of
the identification info, refer to AT Attachment Interface for
Disk Drives (ANSI ASC X3T9.2 working draft, revision 4a, April
19/93).
-I Request identification info directly from the drive, which is
displayed in a new expanded format with considerably more detail
than with the older -i flag.
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It is possible that something is configured to set DMA for one drive and not the other. Get the _current_ info with -I .
Also check kernel for "use dma when available" , cant give it you exactly off my head but you'll find it.
Here's my 120G Barracuda IDE 8M cache for comparison.
| Code: | bash-3.00#hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 1308 MB in 2.00 seconds = 653.77 MB/sec
Timing buffered disk reads: 160 MB in 3.02 seconds = 52.99 MB/sec
bash-3.00#hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 1304 MB in 2.00 seconds = 651.12 MB/sec
Timing buffered disk reads: 164 MB in 3.00 seconds = 54.58 MB/sec
bash-3.00#hdparm -tT /dev/hda1
/dev/hda1:
Timing cached reads: 1316 MB in 2.00 seconds = 657.44 MB/sec
Timing buffered disk reads: 156 MB in 3.00 seconds = 51.96 MB/sec
bash-3.00#hdparm -tT /dev/hda9
/dev/hda9:
Timing cached reads: 1308 MB in 2.00 seconds = 652.47 MB/sec
Timing buffered disk reads: 146 MB in 3.00 seconds = 48.66 MB/sec
bash-3.00#hdparm -tT /dev/hda20
/dev/hda20:
Timing cached reads: 1316 MB in 2.01 seconds = 656.13 MB/sec
Timing buffered disk reads: 104 MB in 3.03 seconds = 34.27 MB/sec
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Drops off significantly near the end.
HTH 
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longodj
Tux's lil' helper
Joined: 29 Aug 2003
Posts: 79
Location: New Jersey
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| Posted: Wed Oct 19, 2005 5:14 pm Post subject: |
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I don't know if this will help but I have two raptors and I use and they work a good amount better than before
| Code: | Pre-hdparm ( default hdparm -d1 )
/dev/sdb:
Timing cached reads: 4580 MB in 2.00 seconds = 2290.35 MB/sec
Timing buffered disk reads: 186 MB in 3.00 seconds = 61.95 MB/sec
Post-hdparm ( modified hdparm -d1 -A1 -M1 )
/dev/sdb:
Timing cached reads: 4832 MB in 2.00 seconds = 2416.37 MB/sec
Timing buffered disk reads: 186 MB in 3.00 seconds = 61.95 MB/sec |
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