[DRBD-user] DRBD w/RAID5 - Ubuntu Server

Henri Cook drbd at theplayboymansion.net
Sat Aug 9 18:23:25 CEST 2008

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

Dear all,

I've just configured a 1.8TB DRBD shared device on a pair of machines 
connected to the same fairly standard home router (the documentation is 
_excellent_ by the way!)

The two devices are synchronising now but worryingly very slowly and i'm 
not sure if it's a RAID5 issue or what? Here's an example of /proc/drbd. 
Eventually I want to go for a Primary/Primary setup


version: 8.0.11 (api:86/proto:86)
GIT-hash: b3fe2bdfd3b9f7c2f923186883eb9e2a0d3a5b1b build by phil at mescal, 
2008-02-12 11:56:43
 0: cs:SyncSource st:Primary/Secondary ds:UpToDate/Inconsistent C r---
    ns:111432 nr:0 dw:0 dr:111432 al:0 bm:6 lo:0 pe:0 ua:0 ap:0
        [>....................] sync'ed:  0.1% (1773089/1773198)M
        finish: 1260:51:49 speed: 344 (232) K/sec
        resync: used:0/31 hits:55709 misses:7 starving:0 dirty:0 changed:7
        act_log: used:0/257 hits:0 misses:0 starving:0 dirty:0 changed:0


As you can see 232k/s doesn't seem especially quick

Bits of my config file:


common {
syncer { rate 40M; }
protocol C;

 on alpha {
    device     /dev/drbd0;
    disk       /dev/md4;
    flexible-meta-disk  internal;

on beta {
    device    /dev/drbd0;
    disk      /dev/md4;
    meta-disk internal;

    al-extents 257;


Thanks in advance,


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