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