[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:
> 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

More information about the drbd-user mailing list