[DRBD-user] Bandwidth limit?

Lorenzo Milesi lorenzo.milesi at yetopen.it
Mon Dec 8 22:33:51 CET 2008

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Hi all...

I already wrote before on the list about the solution I have at a
customer running DRBD8+OCFS2 on two remote sites connected via VPN.
The situation is resumed as:
SITE A: Dual Core 2GHz Pentium, 1Gb ram, 1 SATA hdd for /, 3 SATA hdd in
software raid5, DRBD on /dev/md0. 
SITE B: Quad Core 2.4HGz Pentium, 2Gb ram, 3 SATA HDD in software raid5,
DRBD on /dev/md1.

The two sites are connected using two ADSL, with TWO bonded VPN.

Both machines run Debian Etch fully updated, kernel 2.6.26-bpo.1-686 SMP
with deadline scheduler, DRBD 8.0.13, OCFS2 1.4.1-1. 
The shared data partition is 187G, 30 of which used.

What would be the lowest needed bandwidth for DRBD to work correctly?
Actually we have around 200/400kB, but we experience very slow
operations on the filesystem, like for normal directory listing or rsync
backups. In OCFS2 they told me it could be a bandwidth problem, partly
due to FS and partly to the block device. What are DRBD's minimum
requirements?

Thank you.
-- 
Lorenzo Milesi - lorenzo.milesi at yetopen.it

YetOpen S.r.l. - http://www.yetopen.it/
C.so E. Filiberto, 74 23900 Lecco - ITALY -
Tel 0341 220 205 - Fax 178 607 8199

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Grazie.




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