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Old 11-05-2007, 07:05 AM   #1
the.madjack
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Registered: Apr 2006
Distribution: Slackware 10.2
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slow transfer rate on firewire400 external harddisk


Hi guys,

Recently, i just purchased Maxtor One Touch III 200GB with firewire400. And i did a comparison with my other USB2.0 external hard disk. Both of them are 7200rpm-based. Here's the output for USB2.0 ext hard drive :-

Code:
madjack@darkstar:/# hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   1870 MB in  2.00 seconds = 935.23 MB/sec
 Timing buffered disk reads:   94 MB in  3.05 seconds =  30.78 MB/sec
madjack@darkstar:/#
While my new Maxtor Firewire harddisk show a dissapointing:-

Code:
madjack@darkstar:/# hdparm -Tt /dev/sdc

/dev/sdc:
 Timing cached reads:   1866 MB in  2.00 seconds = 933.15 MB/sec
 Timing buffered disk reads:   78 MB in  3.07 seconds =  25.40 MB/sec
madjack@darkstar:/# hdparm -Tt /dev/sdb

And here is the output of /var/log/messages once i power up my Maxtor :-

Code:
Nov  5 21:44:20 darkstar kernel: scsi10 : SBP-2 IEEE-1394
Nov  5 21:44:21 darkstar kernel: ieee1394: sbp2: Logged into SBP-2 device
Nov  5 21:44:21 darkstar kernel: ieee1394: sbp2: Node 0-00:1023: Max speed [S400] - Max payload [2048]
Nov  5 21:44:21 darkstar kernel: scsi 10:0:1:0: Direct-Access     Maxtor   OneTouch III     0338 PQ: 0 ANSI: 4
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] 398297088 512-byte hardware sectors (203928 MB)
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] Write Protect is off
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] Cache data unavailable
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] 398297088 512-byte hardware sectors (203928 MB)
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] Write Protect is off
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] Cache data unavailable
Nov  5 21:44:21 darkstar kernel:  sdc: sdc1
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: [sdc] Attached SCSI disk
Nov  5 21:44:21 darkstar kernel: sd 10:0:1:0: Attached scsi generic sg2 type 0
However, when i try the speed of Maxtor in my window box, it showed the transfer rate at 42Mbytes/sec using hdtach software. Could this be that the IEEE1394 support for linux isnt as good as windows? or it is just that i cant use hdparm as a real performance test result?

Your input is highly appreciated!

Last edited by the.madjack; 11-05-2007 at 07:46 AM.
 
  


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