Re: [Moosefs-users] Is it possible to make separate mfs-mount points on different sets of hdd drives?

[Anh K. H. <ky...@vi...>]

On Tue, 21 Dec 2010 16:54:02 -0700
Jun Cheol Park <jun...@gm...> wrote:
> ...
> Now let me describe what I want in detail. For example, suppose
> that I have the following mfs-mount point using "mfsmount -H
> 10.1.2.22  -o suid -o dev -o rw -o exec /mnt/mfs."
> 
> # cat /etc/mfs/mfshdd.cfg
> /home/mfs-rdvol1
> /home/mfs-rdvol2

So "/home/mfs-rdvol{1,2}/" will be used by mfsmaster/chunk server (to store data) and they are *transparent* to end users (to clients). You can write data directory to /home/mfs-rdvol{1,2}.

> ...
> However, I want to let /mnt/mfs points out only to /home/mfs-rdvol1
> while /mnt/mfs2 uses /home/mfs-rdvol2, illustrated below as an
> example.
> 
> # df -h | grep mfs
> mfs#10.1.2.22:9421     24T  399G   24T   2% /mnt/mfs
> mfs#10.1.2.22:??         10T     1T   10T   10% /mnt/mfs2
> 
> However, I got the following error when I tried to add a separate
> mount point:
> 
> # mfsmount /mnt/mfs2 -H 10.1.2.22 -S /home/mfs-rdvol2 -o suid -o dev
> -o rw -o exec
> mfsmaster register error: No such file or directory

Because "/home/mfs-rdvol2" isn't a exported directory. If you want to mount "/foo/bar/" from the mfsmaster, that directory should be mentioned in "mfsexports.cfg".

> How can I get a separate mfs-mount point (/mnt/mfs2) that sits on a
> different set of hdd drives?

I have no idea why you need that. You can remove the second disk (/home/mfs-rdvol2) from the current master, and install another mfsmaster/mfschunk servers that use "/home/mfs-rdvol2" -- but this way is too complex. I mean you would have two different setup of MooseFS.

Regards,

-- 
Anh Ky Huynh at UTC+7