[Ocfs2-users] Using OCFS2 for heavy I/O

[Alexei_Roudnev]

I run a stability test, using OCFSv2 in the lab for document storage (not so
many directories, but still many thousands of files, on 2
servers) and had devastating results - system crashed 2 times (I mean -
whole cluster) in 2 weeks, first time it damaged system disk on one of the
servers (making it useles until I reinstalled it), second it just freeze on
one server and sticked on another, and it had a damaged (bad link counter)
in 1 directory in the very end.

Adding dumb _self fencing_ schema (which cause system to suicide regularry),
very bad setting for heartbeat (you can not specify few interfaces, as youc
an in any professional cluster system), and bad tuning capabilities (you can
work out 12 second timeout on heartbeat, but you can not do anything with a
few other timeouts), I treat OCFSv2 as _ready for experimental usage only_,
and gave up (not a surprise - I expected something like this).

The only good point was - it never lost data and it never damaged user's
data. -:)

PS. If you run it - make 3-d node, even if you don't use it in application.
It (at least) solve 'second node suicide' problem.

PS. System was SP3 update, i386, kernel 257. I plan to make the same
experiment on better servers with x86_64.
I have OCFSv2 using for Oracle backups (in the lab) without any problems for
2 month.


----- Original Message ----- 
From: "Robinson Maureira Castillo" <rmaureira at solint.cl>
To: <ocfs2-users at oss.oracle.com>
Sent: Monday, July 10, 2006 6:19 AM
Subject: [Ocfs2-users] Using OCFS2 for heavy I/O


Hi all,

I have to evaluate OCFS2 for a mail cluster, and reviewing at the docs, it
says that it  can't hold more than 32000 subdirectories, this is a per-level
limit? And what about files?

This application uses directory hashing for user storage, so eventually,
we'll end up with millions of directories and millions of files, usually
small (< 16KB), but I guess we never get over this limit in a directory
level, at least not for directories.

Currently we're splitting the FS in 1TB vdisks, our storage system is HP EVA
8000.

Can OCFS2 be used in this scenario? Or when is planned to kill that
subdirectory limit?

TIA and best regards,

__________________________
Robinson Maureira Castillo
Soluciones Integrales S.A.
Eleodoro Flores 2425, Ñuñoa, Santiago - Chile
Central: (56 2) 411 9000   Fax: (56 2) 411 9001
Directo: (56 2) 411 9047
Móvil:    9 599 4987
e-mail: rmaureira at solint.cl

_______________________________________________
Ocfs2-users mailing list
Ocfs2-users at oss.oracle.com
http://oss.oracle.com/mailman/listinfo/ocfs2-users