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