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RE: Cluster File System Versus ASM for RAC Deployment in Production?... Pros & Cons

From: Matthew Zito <mzito_at_gridapp.com>
Date: Thu, 6 Dec 2007 09:50:47 -0500
Message-ID: <C0A5E31718FC064A91E9FD7BE2F081B1D5170F@exchange.gridapp.com>

I'm sorry, I was unclear in my response - problem with responding to Oracle-L pre-coffee. Tunefs.ocfs2 is fine for growing a filesystem, but it has to be unmounted when you do that, and your storage array has to support extending devices. Many of the storage arrays today either don't support growing LUNs, or support it in a shabby way, and a lot of organizations don't like taking downtime to add disk space, both of which make OCFS2 less suitable for datafiles, etc., where there is likely to be growth over time.

The real piece that OCFS needs is a proper volume manager, so that the filesystem itself could be striped across multiple devices, and managed online. If you're using ASM, there's no need to deal with taking anything offline to add more space, just add another disk. There's some stupidity in the 10gR2 ASM rebalancing code, but it is a lot better in 11g.

Thanks,
Matt

--
Matthew Zito
Chief Scientist
GridApp Systems
P: 646-452-4090
mzito_at_gridapp.com
http://www.gridapp.com



-----Original Message-----
From: Dan Norris [mailto:dannorris_at_dannorris.com]
Sent: Thu 12/6/2007 9:34 AM
To: Matthew Zito; VIVEK_SHARMA_at_infosys.com; oracle-l_at_freelists.org
Subject: Re: Cluster File System Versus ASM for RAC Deployment in Production?... Pros & Cons
 

>> However, OCFS2 has no capability
for growing filesystems, creating situations where using OCFS2 for datafiles means increasing the number of mounts over time, which gets messy. That's incorrect. "tunefs.ocfs2 -S /dev/sde1" will grow the FS to the size of the partition where it resides. Just tested it this week: [root_at_ch-srlxdb01 ~]# tunefs.ocfs2 -S /dev/sde1 tunefs.ocfs2 1.2.7 Changing volume size from 1309649 blocks to 1834541 blocks Proceed (y/N): y Resized volume Wrote Superblock -- http://www.freelists.org/webpage/oracle-l
Received on Thu Dec 06 2007 - 08:50:47 CST

Original text of this message

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