[DRBD-user] drbd report incorrect sync speed - SOLVED

Daniel Bourque dbourque at weatherdata.com
Tue Mar 10 23:16:44 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.


nm... I can't tell my bits from my bites :)

1Gbps = 0.125 GB/s

1500 GB   /  0.125   * 60 * 60 = 3.3 hours
 
duh


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




Daniel Bourque wrote:
> 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 !
>



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