[DRBD-user] DRBD slow sync

Dan Gahlinger dgahling at gmail.com
Mon May 19 18:57:42 CEST 2008

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

speaking of slow sync, I have a similar issue.
using a cross-over cable (2ft length) on gig interfaces, I can't set rate to
anything over 11M
if I do, the units disconnect and go primary/unknown unknown/secondary. no
matter what I do.
yet I can transfer data and files across the dedicated link at really high
it's kind of crazy that a gig link interface can only do 11M in drbd.
so I think it's related to this issue somehow.

On Mon, May 19, 2008 at 10:19 AM, Tomasz Chmielewski <mangoo at wpkg.org>

> Anže Vidmar schrieb:
>> hello list!
>> I've setup a fresh install of DRBD + OCFS2 on the machine with the
>> following properties:
>> OS: (Bluewhite64 12) Linux
>> ARCH: x86_64
>> CPU:8 x Intel(R) Xeon(R) CPU E5430  @ 2.66GHz
>> eth0 = 1Gb
>> DRBD version =  8.2.5
>> The problem is that DRBD sync in very slooooow, around 315k/s. There is no
>> way I can speed-up the process. The storage with OCFS2 is 3.2T large and
>> it's build on hardware RAID5 + 1 spare.
>> Here is what I've already did:
>> - changed the UTP cable (cross and regular)
>> - tried with kernel that has DRBD included in, and kernel + DRBD module
>> - I've test the data transfer directly on eth1 - the transfer was normal
>> aroung 75M/s, so the link between the secondary (eth1) NIC's is ok
>> - played with ethtool - I've setup the card to 100/1000M, half/full
>> duplex... No change
>> - tweaking drbd.conf "net" parameters. No speed change at all.
>> Anyone have any idea what might be causing the slow sync? Is this normal
>> for the 1st time sync?
> According to http://www.drbd.org/users-guide/re-drbdconf.html the default
> rate is just 250 KB/s:
> rate rate
>    To ensure a smooth operation of the application on top of DRBD, it is
> possible to limit the bandwidth which may be used by background
> synchronizations. The default is 250 KB/sec, the default unit is KB/sec.
> Optional suffixes K, M, G are allowed.
> --
> Tomasz Chmielewski
> http://wpkg.org
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> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
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