similar to: A couple more minor questions about OCFS and RHE L3

Sort of a followup... We've been running OCFS in sync mode for a little over a month now, and it has worked reasonably well. Performance is still a bit spotty, but we're told that the next kernel update for RHEL3 should improve the situation. We might eventually move to Polyserve's cluster filesystem for its multipathing capability and potentially better performance, but at least we

Running database in ASYNC mode in RHEL 3 has a potential risk of redo logs failure due to some short io's. A note from http://oss.oracle.com/projects/ocfs/dist/files/RedHat/RHEL3/i386/README.txt says that the above mentioned problem is fixed in OCFS 1.0.9-12 "RELEASE 1.0.9-12 Fixes a potential corruption with large, aligned, direct I/Os, for example Oracle redo logs or direct path SQL

Is the following statement still valid for either OCFS 1.0.9-12 or OCFS 1.0.11-1? The following is from one of the questions put forward by Derek Suzuki on Ocfs-users "A couple more minor questions about OCFS and RHEL3" > Next, I saw a Metalink thread which suggests that async I/O is not > supported on OCFS with RHAS 2.1. It doesn't say anything about RHEL3. > We've

Oracle appears to have Wim chained in the basement, forced to answer mailing list questions at all hours. I do appreciate it. Our cluster has been stable since we installed RAC, but a few minor issues have me concerned. First, our storage array seems to maintain continuous low-level activity even when the database is shut down. The CPUs spend a modest amount of time in iowait state while this

Hi experts, My customer issued debugocfs to check for file_size and extent info but values such as file_size, alloc_size, next_free_ext were 0. (/dev/sdi1 contains datafiles and arc files) # debugocfs -a 0 /dev/sdi1 debugocfs 1.0.10-PROD1 Fri Mar 5 14:35:29 PST 2004 (build fcb0206676afe0fcac47a99c90de0e7b) file_extent_0: file_number = 128 disk_offset = 1433600 curr_master = 0 file_lock =

A few weeks back we opened a TAR with Oracle support to determine whether an OCFS (1.0.9-12) + async configuration was considered supportable. At first a technician said yes, but I followed up with Wim's explanation of how that combination is potentially troublesome and inadequately tested. The technician double-checked, then confirmed that OCFS + async is considered risky. He did say that a

having a problem with ocfs. device /dev/sdd mounted on 2 nodes, node 0 and node 1 tried to create file /u01/oracle/prod/proddata/temp01.dbf from node 1 (ALTER TABLESPACE TEMP ADD TEMPFILE...) caused oracle server process to hang in a "D" state apparently trying to create the file. the file has not been created yet. If I type "ls" from node 2 in directory /u01/oracle/prod

Hi, First of all great project You are developing, really usefull,but.... Compiling the OCFS System under a clean RedHat 8 Installaton renders an error during compilation: make -C format make[2]: Entering directory `/root/ocfs-1.0.8/tools/format' gcc -g -O2 -pipe -I../../ocfs2/Common/inc -Iinc -I../../tools/debugocfs -I../../ocfs2/Linux/inc -DLINUX -DUSERSPACE_TOOL -o format.o -c

>also - for async io ; >p2448994_9204_LINUX.zip is the patch to apply for oracle >(this is metalink ARU patch number). Wim, The patch description on Metalink says: DIRECT IO SUPPORT ON EXT2 FILESYSTEM Which wasn't quite what I was expecting. Kevin -----Original Message----- From: Wim Coekaerts [mailto:wim.coekaerts@oracle.com] Sent: 25 November 2003 03:23 To: Brian M. Diehl

Hi, I installed a 2.4.18 kernel, with ext3 support and make a tune2fs -j /dev/sdxxx with all partitions, now I want to run a 2.2.20 kernel, I want to know if I can use the patch for 2.2.20 series (0.0.7a) without problems with my new ext3 partitions, or I must mount it as ext2 from 2.2.20, greetings and reply to admin@cideweb.com, I'm not subscribed to the list.

an ocfs-volume was nearly full (only 800MB free). i deleted some datafiles to free space: $ df -h . Filesystem Size Used Avail Use% Mounted on /dev/sdp1 10G 5.3G 4.8G 53% /db/DPS so there are more than 4GB available. $ sqlplus /nolog SQL*Plus: Release 9.2.0.4.0 - Production on Wed Sep 1 12:57:48 2004 Copyright (c) 1982, 2002, Oracle Corporation. All rights

Dear all, A quick question which I somehow cannto figure out: I want to apply the function "any" to subsets of a dataset in order to create a vector with TRUE/FALSE values, depending on whether a subset has the number 5. I.e., y <- matrix(c(1,2,3,3,4,5,5,6,6,7,5,1,1,3,5,NA,5,1,1,3),ncol=2) > y [,1] [,2] [1,] 1 5 [2,] 2 1 [3,] 3 1 [4,] 3 3 [5,]

Well, I've downloaded the kernel source code from http://mirror.dulug.duke.edu/pub/redhat/linux/updates/enterprise/2.1AS/en/os /SRPMS/kernel-2.4.18-e.40.src.rpm and compiled it for x86 (i686). Is this kernel compatible with ocfs ?? __________________________________________ Mauro Staretz - MI Montreal Inform?tica Ltda Microsoft MCSE+I / MCDBA / MCP - Oracle OCP Tel: 55-21-2291-6116 R.2104

Hi All Does anyone have information on OCFS compatibility with Legato. i.e Can we use Letato to backup directly from OCFS Volumes. Also does OCFS work with BCV. R'gds Varghese Abraham. -----Original Message----- From: ocfs-users-bounces@oss.oracle.com [mailto:ocfs-users-bounces@oss.oracle.com]On Behalf Of Wim Coekaerts Sent: Thursday, September 02, 2004 9:33 AM To: Andreas Piesk Cc:

Hi all, Sorry to break in, but I find this thread a bit interesting. Jeram: I'm not very familiar with HP storage and cannot find too much info on the EVA 6000 array. Is it related to the EVA 5000 somehow, or is it a NAS array? In any case, how is the array configured. If the algorithm for hartbeat is as described earlier (36 sector reads and one write per second (per host???)) then you

Oh yeah - easy way to check, Randy: Next time your node hangs, get on the OTHER NODE and go into each directory where files are being opened (datafiles, archivelogs, controlefiles, redo logs, etc) and delete a file (you can create one first then delete it). If this causes the hung node to recover then you're having the same problem I was having. Jeremy >>> "Jeremy

Sunil Mushran wrote: >And as that gets into reading debugocfs outputs, the user has to make the determination, if the effort is worth the gain in performance. Why only logfiles? Well, because Oracle performs large ios only to the logfiles. The ios to be datafiles are in smaller chunks. Hope this helps. Sunil I'd like to point out a small mistake in this post. Oracle most certainly

Another question. When my database is running, I do [oracle@LNCSTRTLDB03 LPTE3]$ cp --o_direct xdb01.dbf /tmp cp: cannot open `xdb01.dbf' for reading: Permission denied [oracle@LNCSTRTLDB03 LPTE3]$ When the database is shudown it works. Is this normal for ocfs because with any other filesystem I can just copy a file at any time (Its only a testing, I know I cant copy datafiles and have

We are also thinking about locking for each read/write, but would its = overhead be too high? We have another idea that is extending the function of flock, lockf, = fcntl to distributed. So any application that need strict data consistent can do a lock = operation on the whole or part of the file. For ordinary application, maybe the current logic is enough. How about it? >-----Original

Wim, Thanks for your prompt response on this. The tpmC figures look very impressive, and tpmC is read intensive. I had already read note 236679.1 "Comparing Performance Between RAW IO vs OCFS vs EXT2/3" which I guess is the article to which you are referring; it made me suspect that the poor performance was due to the lack of an OS IO cache but I wasn't sure. The database is