[DRBD-user] LVM, ext3, 3ware, Write Caching, and block sizes

Lars Ellenberg lars.ellenberg at linbit.com
Thu Jan 15 12:25:39 CET 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On Thu, Jan 15, 2009 at 03:04:53AM -0800, Michael Moody wrote:
> We have a nested lvm2 on CentOS 5.2 with reiserfs on top.
> Lvm2->drbd->lvm2->reiserfs (actually, we have 3 volumes this way, each
> at least 3.5TByte). All this is on a 3ware 9650 16 port card. I don't
> have a bbu on it, but it IS possible to enable the cache on the 3ware
> card using the 3ware cli, though it will warn you about not having the
> bbu. I did the same thing.

are you saying you have 3.5 TB reiserfs on 512 MB volatile cache,
or did you just point out that it was technically possible
to enable the cache despite not having a bbu?

if you do run reiserfs with volatile cache enabled,
some may say that is not even brave anymore...

just don't come complaining about data loss
after the next crash or power loss.

good luck.

-- 
: 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.
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