[Beowulf] Re: mysterious slow disk

Steffen Grunewald steffen.grunewald at aei.mpg.de
Tue Mar 4 03:39:18 EST 2008


On Mon, Mar 03, 2008 at 02:25:24PM -0800, David Mathog wrote:
> Bruno Coutinho wrote:
> 
> >  What is the Reallocated_Sector_Ct in smartctl? If it's non zero, you will
> > have badblocks soon.
> > 
> > How is the Seek_Error_Rate is compared with orher HDs?
> 
> Here is part of smartctl -a for the slow one, with some columns
> edited out so that it will fit without wrapping.  The disk is old but
> it isn't throwing any conventional sorts of errors:
> 
> ID# ATTRIBUTE_NAME          FLAG       UPDATED  WHEN_FAILED RAW_VALUE
>   1 Raw_Read_Error_Rate     0x000b     Always       -       0
>   3 Spin_Up_Time            0x0007     Always       -       2658
>   4 Start_Stop_Count        0x0032     Always       -       88
>   5 Reallocated_Sector_Ct   0x0033     Always       -       0
>   7 Seek_Error_Rate         0x000b     Always       -       0
>   9 Power_On_Hours          0x0032     Always       -       44036
>  10 Spin_Retry_Count        0x0013     Always       -       0
>  11 Calibration_Retry_Count 0x0013     Always       -       0
>  12 Power_Cycle_Count       0x0032     Always       -       88
> 196 Reallocated_Event_Count 0x0032     Always       -       0
> 197 Current_Pending_Sector  0x0012     Always       -       0
> 198 Offline_Uncorrectable   0x0012     Always       -       0
> 199 UDMA_CRC_Error_Count    0x000a     Always       -       0
> 200 Multi_Zone_Error_Rate   0x0009     Offline      -       0

Looks clean.

(Sorry, but I probably missed part of the thread:)
Did you check the (U)DMA mode? (hdparm -di /dev/hd*)

Would a full reboot (power down, power up) change the performance?

Steffen

-- 
Steffen Grunewald * MPI Grav.Phys.(AEI) * Am Mühlenberg 1, D-14476 Potsdam
Cluster Admin * http://pandora.aei.mpg.de/merlin/ * http://www.aei.mpg.de/
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