Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Thu, Apr 30, 2009 at 5:18 PM, Tom Brown <wc-linbit.com@ vmail.baremetal.com> wrote: > > I'd expect that if he's seeing sync's running faster than application > level writes, then there is an issue with write-barriers. DRBD is taking > steps to provide write-ordering protection, which aren't relevent to > bulk/block copying of re-syncing. > > e.g. http://www.drbd.org/users-guide/re-drbdconf.html > no-disk-barrier , no-disk-flushes , no-disk-drain I've generally established that for best performance on my hardware, I need no-disk-flushes, no-md-flushes, and no-disk-barrier, and they've all been in place already. no-disk-drain does not improve anything, and was mentioned by Lars as a bad idea if the other three are present. The connection is capable of at least ~900MB/s (Infiniband), and the top observed DRBD sync speed is 400MB/s as mentioned. For testing purposes, the metadata is on a ramdisk. Thanks, -Gennadiy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20090430/73cfbe68/attachment.htm>