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Old 11-25-2009, 03:42 PM
Keith Clark
 
Default System Load Extreme and Non Responsive

My system seems to become unresponsive every about half hour and the
Load goes through the roof. CPU usage does not seem to be high, nor
network usage during this period.

I looked at my syslog for that time period and I see the following block
of entries over and over again:

Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533198] ata1.00:
exception Emask 0x0 SAct 0x7 SErr 0x0 action 0x0
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533208] ata1.00:
irq_stat 0x40000008
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533226] ata1.00: cmd
60/f8:08:89:22:8b/00:00:1b:00:00/40 tag 1 ncq 126976 in
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533230] res
41/40:00:22:23:8b/e7:00:1b:00:00/40 Emask 0x409 (media error) <F>
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533260] ata1.00:
status: { DRDY ERR }
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533264] ata1.00:
error: { UNC }
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.534164] ata1.00:
SB600 AHCI: limiting to 255 sectors per cmd
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.535146] ata1.00:
SB600 AHCI: limiting to 255 sectors per cmd
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.535152] ata1.00:
configured for UDMA/133
Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.535171] ata1: EH
complete

Is this evidence of a drive error? It seems to have begun after a power
failure and only happens to one user, the one who was logged in at the
time of the power failure. The other user does not experience this same
issue.

Thanks,

Keith



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Old 11-26-2009, 06:44 AM
Xandros Pilosa
 
Default System Load Extreme and Non Responsive

Dne 25.11.2009 (sre) ob 11:42 -0500 je Keith Clark zapisal(a):
> My system seems to become unresponsive every about half hour and the
> Load goes through the roof. CPU usage does not seem to be high, nor
> network usage during this period.
>
> I looked at my syslog for that time period and I see the following block
> of entries over and over again:
>

Hello Keith,
following comments are from [1]

> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533198] ata1.00:
> exception Emask 0x0 SAct 0x7 SErr 0x0 action 0x0

Emask == ATA command's internal error mask (AC_ERR_xxx in source code)
SErr == SATA SError register action

> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533208] ata1.00:
> irq_stat 0x40000008
> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533226] ata1.00: cmd
> 60/f8:08:89:22:8b/00:00:1b:00:00/40 tag 1 ncq 126976 in

The "cmd" line gives the ATA command (taskfile) sent to the device

> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533230] res
> 41/40:00:22:23:8b/e7:00:1b:00:00/40 Emask 0x409 (media error) <F>

media error == Software detected a media error

> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533260] ata1.00:
> status: { DRDY ERR }

DRDY ERR == Device ready error

> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.533264] ata1.00:
> error: { UNC }

UNC == Uncorrectable error - often due to bad sectors on the disk

> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.534164] ata1.00:
> SB600 AHCI: limiting to 255 sectors per cmd
> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.535146] ata1.00:
> SB600 AHCI: limiting to 255 sectors per cmd
> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.535152] ata1.00:
> configured for UDMA/133
> Nov 25 11:28:57 bookworm-acerdesktop kernel: [ 9440.535171] ata1: EH
> complete
>
> Is this evidence of a drive error?

I would say yes, at least very probably.

> It seems to have begun after a power
> failure and only happens to one user, the one who was logged in at the
> time of the power failure. The other user does not experience this same
> issue.
>
> Thanks,
>
> Keith

One explanation would be, that bad sectors are on a part of the disk,
where /home/affected_user resides, possibly due to hd r/w on this
section of hd during power failure. Anyway, backup (I suppose you
already did that) and then "badblocks" and/or other hd tools would be in
order.

[1] http://ata.wiki.kernel.org/index.php/Libata_error_messages

Regards


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