This looks to be a kernel bug in Hardy...
Hardy worked ok with my older 500GB SATA drives for about 4 months...
just upgraded to faster 1.5TB drives.
With the new drives Hardy would freeze for 20-30 seconds and report "ata
frozen" in the log each time. When watching a 1 hour TV show in mythtv
the problem would occur every 10-20 minutes. Same machine, same OS
install (disk copy to the new drives).
Disabling native command queuing did not fix the problem.
In frustration I installed a stock 2.6.26.1 kernel using the Ubuntu
config file. Problem solved!
Exact error message from the kernel log:
ata1.00: exception Emask 0x40 SAct 0x0 SErr 0x800 action 0x6 frozen
ata1: SError: { HostInt }
ata1.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
res 40/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x44 (timeout)
ata1.00: status: { DRDY }
ata1: hard resetting link
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: configured for UDMA/133
ata1: EH complete
sd 0:0:0:0: [sda] 2930277168 512-byte hardware sectors (1500302 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
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Hardy 64-bit RC ata frozen
https://bugs.launchpad.net/bugs/219786
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