[DRBD-user] Doc update and Sync performance

[Josh Aune]

Hi,

Attached is a patch for the users guide.

Also, I'm having an issue with sync performance.  I have DRBD setup between two hosts using SRP.  Under optimal conditions I'm able to achieve a 500+ MB/s write speed, but during the initial sync after the DRBD device is created the sync proceeds at less than 100 MB/s.  Below is the config file.  Am I missing anything needed to bump up the initial sync speed?

Also, all bytes on the drives on both side are zeros, so the limitation seems to be in the crc32c processing.

Thanks,
Josh

common {
  protocol C;
  disk {
    no-disk-flushes;
    no-md-flushes;
  }
  net {
    allow-two-primaries;
  }
  syncer {
    rate 800M;
    csums-alg crc32c;
    verify-alg crc32c;
  }
  startup {
    become-primary-on both;
  }
}
resource fioa {
  on l1 {
    address    sdp 192.168.0.1:7789;
    device     /dev/drbd1;
    disk       /dev/fioa;
    meta-disk  internal;
  }
  on l2 {
    address    sdp 192.168.0.2:7789;
    device     /dev/drbd1;
    disk       /dev/fioa;
    meta-disk  internal;
  }
}



CONFIDENTIAL

This document and attachments contain information from Fusion-io, Inc. which is confidential and/or legally privileged. 
The information is intended only for the use of the individual or entity named on this transmission. 
If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or taking of any 
action in reliance on the contents of this emailed information is strictly prohibited, and that the documents should be returned to Fusion-io, Inc. immediately. 
In this regard, if you have received this email in error, please notify us by return email immediately.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: users_guide.patch
Type: application/octet-stream
Size: 673 bytes
Desc: not available
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20091229/8b9ad715/attachment.obj>