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, Jul 17, 2009 at 06:17:35PM +0200, Raoul Bhatia [IPAX] wrote: > On 17.07.2009 16:51, Gianluca Cecchi wrote: >> On Fri, Jul 17, 2009 at 4:22 PM, Gianluca >> Cecchi<gianluca.cecchi at gmail.com> wrote: >>> drbd is 8.3.2 and O.S. is F11 x86_64 with kernel 184.108.40.206-191.fc11.x86_64 >>> >>> I read in previous posts that an external meta device of about 4Mb is >>> sufficient for about 100Gb od drbd device >>> (http://lists.linbit.com/pipermail/drbd-user/2009-February/011404.html) >>> >>> In my case with 8.3.2 it seems that 8MB are not enough for 52Gb. >>> I have: >> >> Ok, perhaps it was my fault understanding man page. >> It seems that when you use meta-disk you have to use index and in that >> case you need at least 256MB???? > > as far as i recall you need *exactly* 256mb for your meta disk. get your facts straight. you need _exactly_ 128 MiB _per_ _index_ . which, btw, also means that this form of fixed size external meta data limits usable device size to slightly less than 4TiB. so if you plan to use /dev/whatever only, /dev/whatever needs to be at least 128 MiB. if you plan to use /dev/whatever, .... /dev/whatever, then it needs to be at least 16*128 MiB == 2 GiB. > if /dev/cciss/c0d0p4 is for example 1gb in size, then you can use > /dev/cciss/c0d0p4 throu /dev/cciss/c0d0p4 to store 4 drbd > metadisks nope, on 1GiB, there is enough room for 8 indexed, fixed size drbd meta data blocks. if you want to go for external meta data, you'd be more flexible with flexible-meta-disk on LVs. -- : Lars Ellenberg : LINBIT HA-Solutions GmbH : 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