On Wed, Jul 18, 2007 at 04:23:38PM -0700, Mike Bird wrote: > On Wednesday 18 July 2007 15:50, besonen wrote: > > is it true that with software raid 1 that i cannot have the boot drive > > protected? > > No. However, getting the mirror of the boot drive to be bootable > under grub in readiness for when the boot drive fails does not seem > to me to be quite as easy/reliable as it was under LILO. Maybe a > grub expert can post a reliable recipe here. I believe the newer grubs handle that - they write mbr to all drives in the raid set
>
> > if this is the case what are some work-arounds besides using a
> > 3ware controller for just the boot drive?
>
> n/a
>
> > can i take a single drive that was part of a mirrored array and attach it
> > to another computer and access the data?
>
> With software RAID 1 yes. (But not with other RAID levels.)
>
> > if a hard drive in a mirrored array fails, and i replace the failed drive,
> > will the array auto-rebuild?
>
> Software RAID usually mirrors partitions rather than whole drives.
>
> You'll need to partition the new drive and add the new partititions to
> the RAIDs. A couple of minutes work. The mirrors will then rebuild.
You can have a spare drive sitting in the machine as a hot spare if you want
....
>
> > and during the rebuild process, can the
> > rebuild be throttled such that the system remains usable while the rebuild
> > occurs?
>
> Yes. You can change the speedlimits by echoing integers into
> /proc/sys/dev/raid/speed_limit_{min,max}
>
> --Mike Bird
>
>
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