[DRBD-user] 0.6 vs. 0.7 3ware performance? [Was: Expected syncspeed for a 425gb volume?]

Todd Denniston Todd.Denniston at ssa.crane.navy.mil
Wed Apr 6 22:39:00 CEST 2005

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


Nate Carlson wrote:
> 
<SNIP> 
> Hmm, yeah, I dropped back to 2.4.27 with DRBD 0.6.12:
> 
> 1: cs:SyncingAll st:Primary/Secondary ns:18846540 nr:0 dw:0 dr:18846540 pe:766 ua:0
>         [=>..................] sync'ed:  7.6% (225735/244140)M
>         finish: 0:59:35h speed: 65,748 (60,021) K/sec
> 
> It's a lot smaller array (didn't take the time to figure out how large it
> was), but that's a *lot* better sync speed.
> 
> Installed drbd 0.7 on the same kernel, set up the mirror, and I get:
> 
>  0: cs:SyncSource st:Primary/Secondary ld:Consistent
>     ns:160428 nr:0 dw:0 dr:176812 al:0 bm:27462 lo:0 pe:1070 ua:4096 ap:0
>         [>...................] sync'ed:  0.1% (439106/439259)M
>         finish: 22:39:48 speed: 5,472 (5,384) K/sec
> 
> So, a few questions:
> 
> 1) Any idea why this is? Is there any debugging I can do to help? (These
> boxes aren't live, but will be in a week or so.)
> 
> 2) If there isn't an immediate fix for this, what should I do for my 0.6
> install to make it easier to move to 0.7 when this problem is figured out?
> 

Ouch, that is one heck of a diffrence.  However on thing 0.7 has over 0.6 is
that even on a cold restart, once the devices have fully synced the first
time, is that unless you force it to, 0.7 only has to sync what has changed.
-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane) 
Harnessing the Power of Technology for the Warfighter



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