Volker Armin Hemmann wrote:
On Wednesday 15 December 2010 12:24:58 Dale wrote:
Mark Knecht wrote:
On Wed, Dec 15, 2010 at 9:49 AM, Volker Armin Hemmann
<volkerar...@googlemail.com> wrote:
On Wednesday 15 December 2010 05:54:40 Dale wrote:
According to the mobo manual, if I enable AHCI, it is hot swappable.
and enabling AHCI is the only sane option. So do it.
I
just ain't to comfy doing it. I'd like to see it done with no smoke
getting out first.
no smoke. Worst case: controller hangs, you have to reboot.
The worst case is _slightly_ worse than that, but certainly no smoke.
Some systems (my 6 drive RAID compute server for instance) changes
drive mapping between AHCI and compatibility modes so I had to adjust
/etc/fstab. If Dale is using labels of some type he will likely be
better off than I was.
There certainly won't be any harm caused by changing the BIOS setting
to AHCI and trying it out. Reboot and change BIOS back is all he would
have to do in my experience.
- Mark
Are the drives any faster when using AHCI tho? If the speed is the same
then I may try it next time I reboot but not real sure why it would
matter. I was hoping for something even faster.
ahci is robust, in case of an error you don't have to wait for the 30-ide-
timeout. NCQ can speed up some stuff. AHCI is just the right thing to do.
I had to reboot to plug the UPS up to my serial port so I switched it.
I think this is about the same as I got last time so not really any
faster or anything. This is the results:
fireball ~ # hdparm -Tt /dev/sdb
/dev/sdb:
Timing cached reads: 7932 MB in 2.00 seconds = 3967.66 MB/sec
Timing buffered disk reads: 328 MB in 3.00 seconds = 109.31 MB/sec
fireball ~ #
So, at least we know it doesn't make much difference on this rig anyway.
Dale
:-) :-)
