[DRBD-user] Extremely slow sync speed

Alex Borges alex at co.com.mx
Thu Mar 11 20:54:17 CET 2004


To Many people it seems to escape them that writing into the share while
doing a fullsync will make the sync slower for obvious reasons (akin to
a raid array scrub procedure).

El jue, 11-03-2004 a las 13:20, Mark Hellman escribió:
> Two servers both with 1 Gigabit NICs and connected by a crossed cable.
> When sync starts, the speed is normal (30000 K/sec). After a few minutes,
> it drops to the values seen bellow.
> 
> =================================================================
> # cat /proc/drbd
> version: 0.6.11 (api:64/proto:62)
> 
> 0: cs:SyncingAll st:Primary/Secondary ns:104102280 nr:0 dw:30380
> dr:104095280 pe:45 ua:0
>         [==============>.....] sync'ed: 74.7% (34538/136187)M
>         finish: 3:41:09h speed: 2,676 (5,653) K/sec
> =================================================================
> 
> /dev/nb0 is 133GB in size (LVM beneath DRBD). If the 30000 K/sec transfer
> rate was sustained, the full sync would take about 1.5 hours. But in this
> case it took 10 hours!
> 
> Is this a problem of DRBD or aren't IDE hard drives capable of keeping up
> sustained high transfer rates?
> 
> 
> Thanks
> Mark
> 
> 
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