Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> On Fri, Jun 22, 2007 at 09:24:09AM -0500, CA Lists wrote: >> I have two iSCSI targets that I have drbd 8.0.3 running on (CentOS 5). I'm >> using OCFS2 on my nodes. My question is, which filesystem do I need to >> shrink for DRBD? Do I want to shrink the iSCSI disk on the nodes >> (/dev/sdb1), the actual block device on both iSCSI targets (/dev/sdb), or >> the drbd device on the iSCSI targets (/dev/drbd0)? And can I do this after I >> have used OCFS2 to format the disk? Thanks, > > > ===== situation without drbd: ===== > > |- ~/.../~ - /dev/some/storage -- ~/.../~ -----------------------------| > > ===== situation with drbd, and external drbd metadata: ===== > > completely transparent wrt. /dev/some/storage, > no need to change anything. you just have to have some other block > device available for drbd meta data. > > > |- ~/.../~ - /dev/drbd0 -- ~/.../~ -----------------------------| > |- ~/.../~ - /dev/some/storage -- ~/.../~ -----------------------------| > > |- drbd-md: /dev/other/storage -| > > > ===== situation with drbd, and internal drbd meta data: ===== > > |- ~/.../~ - /dev/drbd0 -- ~/.../~ -------|- drbd-md: INTERNAL -| > |- ~/.../~ - /dev/some/storage -- ~/.../~ -----------------------------| > |.....................| > these are the last > blocks of your > /dev/some/storage > so if you had > any useful > data here, > make sure you move > it away before you > overwrite this area > with drbd meta data > > depending on what has been there (file system, partition, lv), > there are different means to do so. There was nothing on the drives at all. In a chicken-before-egg type of situation, since I don't have /dev/sdb mounted anywhere on the iSCSI targets, I thought I would need to get OCFS2 up and running on one of the nodes and format the drive to be able to do anything with it. Then, I found out ocfs2 provides no way to shrink a filesystem. I found this and am trying to follow it: http://www.gossamer-threads.com/lists/drbd/users/9161 I have no way to get the "Block count" and "Block size" via tune2fs since it's ocfs2 not ext2/ext3. However, is the value from "df" useful at all? Filesystem 1K-blocks Used Available Use% Mounted on /dev/sdb1 975699648 1224960 974474688 1% /data Cat /proc/partitions | grep 'drbd0' shows 147 0 975670156 drbd0 So, /proc/partitions shows a number that is 29492 smaller, which means bad things, right? In other words, I need to probably re-make the ocfs2 file system to be smaller, correct? Thanks for the help. > > > hth. >