Roger Oberholtzer wrote: > On Mon, 2007-06-25 at 11:49 +0200, Carlos E. R. wrote: > > The Sunday 2007-06-24 at 23:06 -0400, James Knott wrote: > > > >>> netfinity:~ # mdadm --add /dev/md0 /dev/sdd2 > >>> mdadm: add new device failed for /dev/sdd2 as 4: Invalid argument > >>> > >>> If I now reboot, I'll be able to add the drive, using the same > command, > >>> like so. > I would say that the kernel does not support hot swapping of disks. In > fact, I read time ago it didn't and was work in progress. I don't know > what is the current state. > > > The kernel does indeed support hot swapping. However, the quality of > > this depends on the underlying hardware. For example, the intel ICHx > > chips require that there be a disk in the machine when it is powered on. > > After that you can hotswap. Don't forget the hotplug option > > in /etc/fstab (or wherever you put the mount options). Also, the ICHx > > chipset seems to require time to sense that a swap has indeed happened. > > So I always: > > > 1. umount the disks to be removed. Since the disks are part of a RAID array, they're not listed in fstab, except for the small slice of one used for /boot.
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