[DRBD-user] Please help with slow Replication / Syncing on debian squeeze 6.0, 8-disk RAID6

Uwe Schuerkamp uwe.schuerkamp at nionex.net
Tue Mar 13 14:14:37 CET 2012

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


One more thing and then I'll leave it at this: 

Disabling the dwc on the slave node does NOT slow down the sync, it's
still ticking along happily at 100MB/sec. Can anyone tell me if HP's
RAID6 controller trial licenses have some sort of bandwidth limit
imposed on them? It's hard to imagine, but I've seen worse in my
days. ;-) 

Today we installed permanent RAID6 licenses on both boxes, that's why
I'm suspecting the above might actually be the case. 

from hpacucli: 

=> controller slot=0 show config detail

Smart Array P410i in Slot 0 (Embedded)
   <snip snip>
   Cache Status: OK
   Accelerator Ratio: 25% Read / 75% Write
   Drive Write Cache: Disabled
   Total Cache Size: 1024 MB
   No-Battery Write Cache: Disabled
   Cache Backup Power Source: Capacitors
   Battery/Capacitor Count: 1
   Battery/Capacitor Status: OK
   SATA NCQ Supported: True

And from proc/drbd: 


version: 8.3.7 (api:88/proto:86-91)
srcversion: EE47D8BF18AC166BE219757
 0: cs:SyncTarget ro:Secondary/Secondary ds:Inconsistent/UpToDate C
 r----
    ns:0 nr:104446148 dw:104446000 dr:0 al:0 bm:6374 lo:38 pe:58477
    ua:37 ap:0 e
p:1 wo:b oos:1895045524
        [>...................] sync'ed:  5.3% (1850628/1952628)M
        finish: 4:04:42 speed: 129,052 (107,232) K/sec



All the best, Uwe 




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