Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Thanks Lars. I printed it out and will definitely take a look. That
would simplify administration if I could just increase quota limits.
I'm just about ready to go into production with this cluster so I'm not
sure I want to mess with it at this point unless it makes a significant
performance difference.
Is there any benefit (speed or otherwise) to using separate drbd's
(replicating on separate ports) as opposed to 1 drbd using quota?
I'm always thinking about ways to simplify just for the sake of
maintenance.
On Fri, 2008-02-15 at 19:08 +0100, Lars Ellenberg wrote:
> On Fri, Feb 15, 2008 at 09:03:06AM -0800, rois wrote:
> > I'm running XFS on top of DRBD on top of LVM on top of a hardware
> > RAID-5. My reasoning was I didn't want to leave a ton of room for my
> > system and log files but wanted to be able to expand them later if I
> > needed to. I figured the easiest way was to put my whole HWRaid-5 Array
> > into the LVM and then parse it out as needed. I'm also running several
> > servers/apps on this cluster whose data I wanted isolated so one service
> > couldn't be crashed by another one using all the space up. This also
> > seemed the most flexible.
> >
> > /dev/sda1 (100%) -> vg0 (lvm2) [sda1 is my HWRAID-5 array]
> >
> > /dev/vg0 > vg0/root “/” (1G) xfs filesystem
> > vg0/var “/var” (1G) xfs filesystem
> > vg0/swap “swap” (1g) swap
> >
> > drbd0 = /dev/vg0/home - HA mounts drbd0 on /home (XFS)
> > drbd1 = /dev/vg0/mysql - HA mounts drbd1 on /mnt/mysql (XFS)
> > drbd2 = /dev/vg0/basic - HA mounts drbd2 on /usr/lib/basic (XFS)
> > drbd3 = /dev/vg0/smb - HA mounts drbd3 on /mnt/smb (XFS)
> >
> > Expanding the drbd's is a little bit of a hassle but since I should have
> > to do it that often I don't care that much. I wonder if there is a
> > linux quota service somewhere that could monitor directory usage instead
> > of using partitions to do that. Hadn't thought of that before but may
> > need to look into it. Expanding a quota (like on a webserver) would be
> > a lot easier. Oh well.
>
> nothing to do directly with drbd, but, since you are using xfs:
> it supports "project quotas", see man xfs_quota, search for directory
> tree quota.
> (you maybe want to check for upgrades of your xfsprogs package)
>
> man page is slightly confusing in the examples, though. basically, for
> your setup on one single mountpoint, you'd have something like
>
> /etc/projects
> 10:/mntpoint/home
> 11:/mntpoint/mysql
> 12:/mntpoint/basic
> 13:/mntpoint/smb
>
> /etc/projid
> home:10
> mysql:11
> basic:12
> smb:13
>
> mkfs.xfs /dev/drbdX
> mount -o prjquota /dev/drbdX /mntpoint
> mkdir /mntpoint/{home,mysql,basic,smb}
> xfs_quota -x -c 'project -s home mysql basic smb' /mntpoint
> xfs_quota -x -c 'limit -p bhard=20G home' /mntpoint
> xfs_quota -x -c 'limit -p bhard=10G basic' /mntpoint
> ...
>