Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Anybody have an idea whats happened (see below)? The iSCSI and NFS load are both KVM images (iSCSI is LVM based). Gerald ----- Original Message ----- > From: "Gerald Brandt" <gbr at majentis.com> > To: drbd-user at lists.linbit.com > Sent: Saturday, November 30, 2013 11:00:20 AM > Subject: [DRBD-user] DRBD with iSCSI vs NFS issue > > Hi, > > I've been running DRBD on my servers for quite some time on some > servers at a clients (a little over a year with this client, I > believe). I've been exporting drbd0 as iSCSI for the entire time. > Write tests over GigE (1B block size, sequential write) gives me an > everage of 118MB/s. Very good. > > Last week, I switched drbd0 from iSCSI to NFSv3 exports. > > Performing the same test (I use XenServer Performance VM tool), I get > very strange behaviour. atop shows an average write speed of ~35 > MB/s. The Perf Tool shows 117-118 MB/s, with drops down to 0MB/s. > There are a lot of drops, and the average via the tool equals what > atop shows. > > If I remove the secondary, performance via NFS jumps and stays at > 117-118 MB/s. > > The underlying DRBD config has not changed at all. > > Why am I seeing the difference between iSCSI exports on drbd0 vs NFS > exporst on drbd0, only when the secondary is attached? > > Gerald > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user >