[DRBD-user] Performance hit DRBD vs raw block device, even when disconnected

Wiebe Cazemier wiebe at halfgaar.net
Mon Jun 4 14:17:32 CEST 2012

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


----- Original Message -----
> From: "Lars Ellenberg" <lars.ellenberg at linbit.com>
> To: "Wiebe Cazemier" <wiebe at halfgaar.net>
> Cc: drbd-user at lists.linbit.com
> Sent: Monday, 4 June, 2012 11:29:20 AM
> Subject: Re: [DRBD-user] Performance hit DRBD vs raw block device, even when disconnected
> 
> Put DRBD meta data on RAID 1.
> Use decent battery backed (or otherwise non-volatile) write cache.
> Disable barriers and flushes in DRBD.

If I disable flushes (along with the already disabled barriers), write performance drops to 5 MB/s.

And about putting meta data on RAID1; do you mean a dedicated array specifically for DRBD meta data?



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