speaking of slow sync, I have a similar issue.<br>using a cross-over cable (2ft length) on gig interfaces, I can't set rate to anything over 11M<br>if I do, the units disconnect and go primary/unknown unknown/secondary. no matter what I do.<br>
yet I can transfer data and files across the dedicated link at really high speed.<br>it's kind of crazy that a gig link interface can only do 11M in drbd.<br>so I think it's related to this issue somehow.<br><br><div class="gmail_quote">
On Mon, May 19, 2008 at 10:19 AM, Tomasz Chmielewski <<a href="mailto:mangoo@wpkg.org">mangoo@wpkg.org</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Anže Vidmar schrieb:<div class="Ih2E3d"><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
hello list!<br>
<br>
I've setup a fresh install of DRBD + OCFS2 on the machine with the following properties:<br>
<br>
OS: (Bluewhite64 12) Linux 2.6.23.9-2<br>
ARCH: x86_64<br>
CPU:8 x Intel(R) Xeon(R) CPU E5430 @ 2.66GHz<br>
eth0 = 1Gb<br>
DRBD version = 8.2.5<br>
<br>
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.<br>
<br>
Here is what I've already did:<br>
<br>
- changed the UTP cable (cross and regular)<br>
- tried with kernel that has DRBD included in, and kernel + DRBD module<br>
- 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<br>
- played with ethtool - I've setup the card to 100/1000M, half/full duplex... No change<br>
- tweaking drbd.conf "net" parameters. No speed change at all.<br>
<br>
Anyone have any idea what might be causing the slow sync? Is this normal for the 1st time sync?<br>
</blockquote>
<br></div>
According to <a href="http://www.drbd.org/users-guide/re-drbdconf.html" target="_blank">http://www.drbd.org/users-guide/re-drbdconf.html</a> the default rate is just 250 KB/s:<br>
<br>
rate rate<br>
<br>
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.<br>
<font color="#888888">
<br>
<br>
-- <br>
Tomasz Chmielewski<br>
<a href="http://wpkg.org" target="_blank">http://wpkg.org</a></font><div><div></div><div class="Wj3C7c"><br>
<br>
<br>
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