Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Steven Wilton schrieb: > > > if I understand the documentation correct, there is a limit of ~4TB > > for a single drbd device on 32bit systems. Furthermore lvm on top of a > > drbd device is not recommended. > > > > What is the recommended way to use drbd and lvm for filesystems that > > are >4TB. My aim would be to have only one mount point, hence lvm on > > top of drbd would be desired. > > > > LVM on top of DRBD causes problems because LVM sees the signatures > on the disks before DRBD starts and tries to use the disks directly. I could solve this with a filter expression in my lvm.conf. Now I have 3 drbd devices in one lvm vg. I started with 2 devices, created the pv, vg, lv and the ext3 filesystem. Then I added the 3. device with pvcreate, vgextend, lvextend, e2fsck and resize2fs. No problem so far. > I thought the "correct" fix for this was to put DRBD on top of LVM > (that's what we do here). Both solutions work, but I think lvm on top of drbd is preferable. http://article.gmane.org/gmane.comp.linux.drbd/6175 For me it's more logical to have the lvm on top of drbd and the filesystem on top of lvm. But I'm a bit worried which nasty things can happen with this setup and what to to then in the right order. Does anyone have some real life examples of possible failurs? Ralf