Gianluca,
if you don't have plan to use mix of 1.8 and 2.0 clients, you can apply small
patch, which should be reduce MDS traffic.
diff --git a/lustre/llite/dcache.c b/lustre/llite/dcache.c
index 22a929d..b133956 100644
--- a/lustre/llite/dcache.c
+++ b/lustre/llite/dcache.c
@@ -427,9 +427,6 @@ int ll_revalidate_it(struct dentry *de, int lookup_flags,
ll_frob_intent(&it, &lookup_it);
LASSERT(it);
- if (it->it_op == IT_LOOKUP && !(de->d_flags & DCACHE_LUSTRE_INVALID))
- GOTO(out_sa, rc = 1);
-
ll_prepare_mdc_op_data(&op_data, parent, de->d_inode,
de->d_name.name, de->d_name.len, 0, NULL);
that patch add more cache on client side, but have some interop issue in mixed
env, which need to be fixed on MDS side.
On Nov 19, 2010, at 14:15, Gianluca Tresoldi wrote:
> Hi everyone,
>
> I'm testing lustre 2.0 in a pre-production environment and I encountered some
> problems.
>
> My test environment consists of:
> 1 MDS/MGS (not combined) with 48G of ram and 16 xeon E5520 core
> 1 OSS with the same characteristics.
> 1 Client
> Both MDS and OSS are connected to an ISCSI shared storage with different
> volumes.
>
> I've also production environment with lustre 1.8.2 and 2 filesystem served by:
> 2 MDS/MGS where each server is active for one file system and passive for
> other.
> 2 OSS: Same configuration of MDS.
> 50 Client that runs apache web-server.
>
> I've performed a 8 hours stress test in both environment using apache log's
> for replicate real traffic, this is the results:
>
> Lustre 1.8.2
> Avg load: on Mds 0,8 on Oss 0,2 and network load on mds (on gigabit NIC
> dedicated to lustre traffic) about 50.000 Kb/s.
>
> Lustre 2.0.0
> Avg load: on Mds 2,8 on Oss 0,1 and network load on mds (on gigabit NIC
> dedicated to lustre traffic) about 180.000 Kb/s.
>
> On lustre 2.0 the network traffic is much higher than on Lustre 1.8.2, if we
> considered that in addition to the stress test, on Lustre 1.8.2, also
> production runs, i think there is a problem.
>
> With TCPDump I saw that when I run multiple "ls -l" on Client connected to
> lustre 1.8.2 only some time client send packet to MDS, with client connected
> to lustre 2.0 all the time.
>
> I Think that client 2.0 doesn' t cache files' attr.
>
>
> could someone help me?
> Thanks in advice and have a very nice day. ;)
>
> P.S.
> Sorry for my not perfect English.
>
> --
> Gianluca Tresoldi
> ***SysAdmin***
> ***Demon's Trainer***
> Tuttogratis Italia Spa
> E-mail: [email protected]
> http://www.tuttogratis.it
> Tel Centralino 02-57313101
> Tel Diretto 02-57313136
> <linux40.jpg>Be open...
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