[aklug] Sudden slow file system access

From: Christopher Howard <christopher.howard@frigidcode.com>
Date: Wed Jan 19 2011 - 21:24:03 AKST

Suddenly I am having a problem with my Linux desktop PC. Applications
and desktop are suddenly becoming super slow and lurching. It seem to be
related to the filesystem; i.e., whenever something tries to access any
of my filesystems, response back is super slow, unless the data was
recently accessed (cached).

Syslog keeps giving me output like this over and over again:

Jan 19 21:10:43 enigma kernel: [ 3068.162953] ata2.00: exception Emask
0x10 SAct 0x0 SErr 0x1810000 action 0xe frozen
Jan 19 21:10:43 enigma kernel: [ 3068.162960] ata2: SError: { PHYRdyChg
LinkSeq TrStaTrns }
Jan 19 21:10:43 enigma kernel: [ 3068.162964] ata2.00: failed command:
FLUSH CACHE EXT
Jan 19 21:10:43 enigma kernel: [ 3068.162970] ata2.00: cmd
ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
Jan 19 21:10:43 enigma kernel: [ 3068.162972] res
d0/00:00:4c:33:e0/00:f0:b8:27:e0/a0 Emask 0x12 (ATA bus error)
Jan 19 21:10:43 enigma kernel: [ 3068.162975] ata2.00: status: { Busy }
Jan 19 21:10:43 enigma kernel: [ 3068.162981] ata2: hard resetting link
Jan 19 21:10:43 enigma kernel: [ 3068.162984] ata2: nv: skipping
hardreset on occupied port
Jan 19 21:10:49 enigma kernel: [ 3074.083019] ata2: link is slow to
respond, please be patient (ready=0)
Jan 19 21:10:50 enigma kernel: [ 3074.644035] ata2: SATA link up 3.0
Gbps (SStatus 123 SControl 300)
Jan 19 21:10:50 enigma kernel: [ 3074.669320] ata2.00: configured for
UDMA/33
Jan 19 21:10:50 enigma kernel: [ 3074.669326] ata2.00: retrying FLUSH
0xea Emask 0x12
Jan 19 21:10:50 enigma kernel: [ 3074.671374] ata2: EH complete

Background info: Gentoo Linux x86_64. I have two almost brand-new 500GB
drives running in a RAID1 (one of those is a replacement disk for that
Seagate drive that went bad a few weeks ago, as I mentioned previously),
with plenty of space on all file systems. There is plenty of unused RAM
memory while all this is happening, and the CPUs never seem to be
overloaded.

(For those who are bound to ask, I /stopped/ doing my disk-to-RAM
experiments several days ago, so that shouldn't be related. :-)

It looks from the log like I might be losing a SATA controller. Any
thoughts?

-- 
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Received on Wed Jan 19 21:24:09 2011

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