[DRBD-user] drbd report incorrect sync speed

Daniel Bourque dbourque at weatherdata.com
Tue Mar 10 21:04:00 CET 2009

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


Hi,

    I am seeing a weird issue with the sync speed as reported in /proc/drbd

...
        [==>.................] sync'ed: 18.1% (1258325/1535953)M
        finish: 3:03:47 speed: 116,824 (111,092) K/sec
                   ^^^^^
                 
@111 MB/sec , 1.5 TB should xfr in ~30 min  , yet it's saying hours !

I xfr'd files over the NFS @ 130 MB/s using the same replication link,

during DRBD sync, vnstats reports:
 
      average              3.09 MB/s  |   116.48 MB/s
 
so the link is good.

hdparm clocks my array's buffered disk ( not cache ) speed at 380 MB/s , 
so the problem is not the array.

I'm quite puzzled here... Anyone has an Idea why this is happening ?


kmod-drbd82-PAE-8.2.6-2
drbd82-8.2.6-1.el5.centos
centos 5
2.6.18-92.1.22.el5PAE #1 SMP Tue Dec 16 12:36:25 EST 2008 i686 i686 i386 
GNU/Linux


Thanks !

-- 
Daniel Bourque
Sr. Systems Engineer
WeatherData Service Inc
An Accuweather Company






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