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

Florian Haas florian at hastexo.com
Mon Jun 4 14:43:31 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.


On Mon, Jun 4, 2012 at 2:17 PM, Wiebe Cazemier <wiebe at halfgaar.net> wrote:
> ----- 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?

I don't think you've told us your DRBD version; that might be a
helpful bit of information.

Cheers,
Florian



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