>Really ?
>I would have thought that if I had 1 and 2 in use and 3 as spare,
>when 1 fails, I get 2 and3 in use, and that when I insert a good replacement
>for 1, it becomes the spare -- is that not the case ?
>Will it actually copy things to 1, and then release 3 back to being spare ?
Oops, hadn't thougt about a hot-spare being available.
if you start with
raid-disk1 /dev/sda1
raid-disk2 /dev/sda2
spare /dev/sda3
you'll get
raid-disk1 /dev/sda3
raid-disk2 /dev/sda2
no spare
after reconstruction
if you hotadd the (repaired or replaced) /dev/sda1 again you'll have
raid-disk1 /dev/sda3
raid-disk2 /dev/sda2
spare /dev/sda1
>> next, install raid stuff, create raid mirror with /dev/sda1 entered as
>> "failed-disk" in raidtab
>
>Please explain `"entered as failed-disk" in raidtab' ...
the patch to raidtools + kernel will add a new keyword for raidtab, you can
put
device /dev/sda1
raid-disk 0
device /foo/bar
failed-disk 1
in your raidtab. the 2nd device will not be touched by raid, it'll be
treated just as if had physically failed.
>> copy your system to the raid device
>How ? using dd or what ?
no, just mke2fs the raid device and copy the stuff over using cp -aR (or
tar or ..)
>What are the args to raidhotadd ?
raidhotadd <md device> <new device>
>
># raidhotadd /dev/md0 /dev/hda7
>/dev/md0: can not hot-add disk: invalid argument.
raidhotadd will only work for raid types supporting redundancy, meaning 1,4
and 5.
>So if I am running RAID0 or linear using 0.50, all I can do is dump and
>restore? For a RAID0 I would expect to be able to shrink the FS (so that the
>end of the underlying partitions are free) and then just write a
Superblock ...
Far as I know that's not implemented yet.
>Under 0.90 ?
>I don't have "--debug" :-(
<rebooting computer to linux before writing anything stupid>
<back in windows>
you do, it's jst not documented :-) Just try
mkraid --debug /dev/md0
>Does it actually write anything, or just read ?
this just reads the configuration and prints it to syslog.
>Ta, but as I indicated, I want somewhat more ...
Understood - I don't know how to do exacty what you need; since this tip
covers at least part of your requests it might still help you.
>However, this is a pain, as there is no need, as root is not RAID. I was
>hoping that I could start the boot, get a working FS, then have the kernel
>poke around for 0xfd partitions, and then while starting them, use kmod to
>load the personalities. Can this be done ?
Far as I know - no.
Bye, Martin
"you have moved your mouse, please reboot to make this change take effect"
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simon media fax: +43-316-813824-6
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