On 2006. 08. 14. 17:55, Oliver Fromme wrote:
We use NetApp Filer clusters (NAS) for that purpose.
They aren't cheap, but they work very well.
I don't like blackboxes with nice GUIs. :)
NFS file handles are based on the inode number. That means
if you want to have a fail-over that's transparent for the
client, your NFS servers would need to have the same inode
numebrs for their files. Normally, the only way to achieve
that is to duplicate the file system from the master to the
slaves using dd(1).
I've already did that (a vnode backed md), but that's not too
comfortable in the long run.
There's another possibility, but I haven't tried it for
myself, so it's just theory. :-) You can try to put
geom_mirror (see gmirror(8)) on top of geom_gate (see
ggated(8), ggatec(8)). Then you will have a RAID1 with
one component local and the other component remote.
However, I think it only works reliably in read-only
mode.
Yes, both of them must be read only, several years ago I've used a
similar setup, but with a shared SCSI disk.
Read only on the client side is OK for me, but is hard to maintain on
the server side.
I guess it would be possible to do this RW, mounted only on the master
and if it fails, remounted (fscked, etc) on the slave, but I consider
that a little bit hackish. I can solve this problem with Linux, but I
would like to do it with FreeBSD, that's why I'm asking. Maybe somebody
has a clever idea, which can make it possible on FreeBSD, without the
above hassles.
Of course what is really needed here is a cluster filesystem, or an NFS
server/file system which can solve this problem at its level.
I don't know if this is an option for you, but you can
also put a minimal root file system into the kernel
(md file system), just sufficient to get networking +
AMD running, and mount everything else via NFS. Another
Yes, I've also thought of that, but that has drawbacks too.
Thanks for the ideas.
--
Attila Nagy e-mail: [EMAIL PROTECTED]
Free Software Network (FSN.HU) phone: +3630 306 6758
http://www.fsn.hu/
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