Thursday 28 of August 2008 07:06:30 Krishna Srinivas napisał(a): > 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"? It seems so. I will split my NS and DATA bricks to different disks today so I will be 100% sure. What I am sure now is that I am getting as many writes as reads when I do "ls" and have more than 2 NS bricks in AFR. -- z poważaniem Łukasz Mierzwa Administrator Sieci Grono.net Spółka Akcyjna ul. Szturmowa 2a, 02-678 Warszawa Sąd Rejonowy dla m.st. Warszawy, XIII Wydział Gospodarczy; KRS 0000228856, NIP: 929-173-90-15 Regon: 080019856 Kapitał zakładowy: 550.000,00 złotych 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.
