Problem detected on Ubuntu Studio x64 12.10 and reproduced under Studio
x64 10.10 (both OSes running on same machine - two different hard
drives).
Slightly the same situation as jdblair above (need to disable write cache on a
disk at boot/resume time), except two differences :
- classic hard drive, not an SSD
- that drive is the boot drive
Added that new drive to be the target boot/root disk for 12.10 fresh install =>
turns out that kernel is unable to flush that disk's write cache when trying to
shutdown, reboot or suspend (machine refuses to suspend and hangs on
reboot/shutdown).
Bottom line : without disabling write caching on the boot disk at boot time,
Ubuntu 12.10 is unusable.
Since hardware enumeration during boot is now completely dynamic, the
different hard drives in the machine don't get the same /dev pointer
each time, hence the UUID and bulk ID symlinks. So I added the following
directive at the end of /etc/hdparm.conf :
/dev/disk/by-id/ata-VB0250EAVER_9VMTTK1M {
write_cache = off
}
But it never seems to be executed at boot time, as you can see below :
root@bigboy:/etc# hdparm -W /dev/disk/by-id/ata-VB0250EAVER_9VMTTK1M
/dev/disk/by-id/ata-VB0250EAVER_9VMTTK1M:
write-caching = 1 (on)
I also commented the "quiet" directive at the beginning of
/etc/hdparm.conf, to have some log of what's going on, but to no avail.
Am I missing something ?
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https://bugs.launchpad.net/bugs/595138
Title:
Settings in /etc/hdparm.conf are not applied during boot
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