default hdparms? readahead=256? Re: WD 400GB xATA Drives

[Linda Walsh <lkml@tlinx.org>]

I've seen similar errors soon after bootup on a 400GB PATA Seagate
drive, but they have mysteriously disappeared so I haven't tracked
them down.

Have you checked if there is a difference in the hard disk parameters?
hdparm -i <drive>.

For some insane reason I haven't tracked down, drives not explicitly
set to known values may not contain "great values".  My "readahead"
value seems to boot with a value of "256" for all of my drives.

Is this not a bit "excessive"?
(

Justin Piszcz wrote:
> When I write to this disk for a while, I see this in dmesg (only once 
> so far):
>
> [31230.223504] ata6: translated ATA stat/err 0x51/04 to SCSI 
> SK/ASC/ASCQ 0xb/00/00
> [31230.223511] ata6: status=0x51 { DriveReady SeekComplete Error }
> [31230.223515] ata6: error=0x04 { DriveStatusError }
>
>
> Is there some sort of smart testing going on constantly?  I only get 
> 26-27MB/s on this 400GB/SATA/16MB/7200RPM drive.  I use smartmontools 
> to do a daily test.  However, even with smart disabled, I get:
>
> # hdparm -t /dev/sde
> /dev/sde:
>  Timing buffered disk reads:   78 MB in  3.06 seconds =  25.46 MB/sec
>
> Does anyone know if this drive has problems in Linux or something?
>
> [    6.895914]   Vendor: ATA       Model: WDC WD4000KD-00N  Rev: 01.0
>
>
> It just seems to be that drive that has issues.
>
> Here is a 400GB seagate ata/100:
> /dev/hde:
>  Timing buffered disk reads:  172 MB in  3.02 seconds =  56.91 MB/sec
>
> Here is a 74GB raptor SATA/150:
> /dev/sda:
>  Timing buffered disk reads:  204 MB in  3.03 seconds =  67.38 MB/sec
>
> Both drives above are on the same system, so my question is what 
> exactly is wrong with the WD drive?  Is it a Linux issue, a drive 
> issue, or?
>
> Does anyone else use this drive, what rates do they get?
>
> What is up with the error in dmesg?
>
>
> # smartctl -d ata -l selftest /dev/sde
> smartctl version 5.34 [i686-pc-linux-gnu] Copyright (C) 2002-5 Bruce 
> Allen
> Home page is http://smartmontools.sourceforge.net/
>
> === START OF READ SMART DATA SECTION ===
> SMART Self-test log structure revision number 1
> Num  Test_Description    Status                  Remaining 
> LifeTime(hours)  LBA
> _of_first_error
> # 1  Short offline       Completed without error       00%      1094 -
> # 2  Offline             Completed without error       00%         0 -
> # 3  Offline             Completed without error       00%         0 -
> # 4  Offline             Completed without error       00%         0 -
> # 5  Offline             Completed without error       00%         0 -
> # 6  Offline             Completed without error       00%         0 -
> # 7  Offline             Completed without error       00%         0 -
> # 8  Offline             Completed without error       00%         1 -
> # 9  Short offline       Completed without error       00%       810 -
> #10  Vendor offline      Completed without error       30%     65280 -
> #11  Offline             Self-test routine in progress 150%     65535 -
> #12  Vendor offline      Self-test routine in progress 150%       255 -
> #13  Vendor offline      Completed without error       00%         0 -
> #14  Offline             Completed without error       00%         0 -
> #15  Offline             Completed without error       00%         0 -
> #16  Offline             Completed without error       00%         0 -
> #17  Offline             Completed without error       00%         0 -
> #18  Offline             Completed without error       00%         0 -
> #19  Offline             Completed without error       00%         0 -
> #20  Offline             Completed without error       00%         0 -
> #21  Offline             Completed without error       00%         1 -
>
>
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