Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tue, Dec 02, 2008 at 01:09:04PM +0000, Hari Sekhon wrote: > Hi, > > I have a server with just around 17TB usable storage which I want to > replicate at the block level via drbd. > > I got the complaint regarding the 16TB max partition size supported, so > reduced the 17TB partition to 16TB and successfully set up the drbd > metadata on it. > > However, now I can only see 8TB of it. > I understand the limit is 8TB having looking through previous mails to > the this list, but then why did it let me use up a 16TB partition and > waste half of it? drbd used to be able to handle 4 TB at max. then some drbd can handle 8 TB on 64bit kernels, but incorrectly pretended it could support 16 TB. that was then fixed in more recent drbd, to actually only support 8TB, and don't try to use more, as otherwise you'd Oops the kernel sooner or later. and now, even more recent drbd, namely drbd 8.3 (to be released "soon"), supports 16 TB (even on 32bit kernel!). it will then probably support even more (probably only on 64bit kernel, though) with some of its dot-releases. > This is running on a x86_64 CentOS 5 server with drbd 0.8.13 (I had been > using drbd 2.8 but this kept crashing the system with a kernel panic > when trying to write to the mounted drbd0 partition with xfs on it. > Downgrading to 8.0.13 and then re-creating the metadata, mounting and > retrying solved the problem) > > Is there any way of getting the thing to do all 16TB of the partition? > > Otherwise I'll have to destroy it and rework it with 2x8TB which would > be a pain. I'd then be tempted to do an lvm on the top of those 2 drbds > even though I know Lars recommends against it, because I really could do > with the 16TB contiguous space replicated... try drbd 8.3, even though its a release candidate only, right now. -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. __ please don't Cc me, but send to list -- I'm subscribed