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? -- Łukasz Mierzwa Grono.net S.A. ul. Szturmowa 2a, 02-678 Warszawa Sąd Rejonowy dla m.st. Warszawy, XIII Wydział Gospodarczy; Nr KRS 0000292169 , NIP: 929-173-90-15 Regon: 141197097 Kapitał zakładowy: 550.000,00 zł http://grono.net/ Treść tej wiadomości jest poufna i prawnie chroniona. Odbiorca może być jedynie jej adresat z wyłączeniem dostępu osób trzecich. Jeżeli nie jesteś adresatem niniejszej wiadomości, jej rozpowszechnianie, kopiowanie, rozprowadzanie lub inne działanie o podobnym charakterze jest prawnie zabronione i może by karalne. Jeżeli wiadomość ta trafiła do Ciebie omyłkowo, uprzejmie prosimy o odesłanie jej na adres nadawcy i usunięcie.
