On Wed, Aug 27, 2008 at 10:55 PM, Łukasz Mierzwa <l.mierzwa@xxxxxxxxx> wrote: > Tuesday 26 August 2008 16:28:41 Łukasz Mierzwa napisał(a): >> Hi, >> >> I testing glusterfs for small files storage, first I've setup a single disk >> gluster server, connected to it from another machine and served those files >> with nginx. That worked ok, I got good performance, on average about +20ms >> slower for each request but that's ok. Now I've setup unify over afr (2 afr >> groups with 3 servers each, unify and afr on the client side, namespace dir >> is on every server, as other stuff afr'ed on the client side), this is >> mounted on one of those 6 servers. After writing ~200GB files from >> production server I started to do some tests and I've noticed that doing >> simple ls on that mount point causes as many writes as reads, this has to >> do something to either unify or afr, I suspect that those writes are do to >> namespace but I need to do more debugging. It's very annoying that simple >> reads are causing so many writes. All my servers are in sync so there >> should not be any need for sealf-healing. Before I start debugging it I >> wanted to ask if this is normal? Shoud afr or unify generate so many writes >> to namespace or maybe xattrs during reads (storage is on ext3 with >> users_xattrs on)? > > I tested it a little bit today and I found out that if I got 1 or 2 nodes in > my afr group for namespace there are no writes at all while doing ls, if I add > one or more nodes they are starting to get writes. WTF? Do you mean that your NS is getting write() calls when you do "ls"?
