Re: jfs2 & 5.2 any performance issues?
From: John Jolet (john.jolet_at_FXFN.COM)
Date: 06/30/03
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Date: Mon, 30 Jun 2003 10:41:51 -0500 To: aix-l@Princeton.EDU
dunno about jfs2 or 5.2, but aix always runs 99% used in memory. you have to look and see how much is computational and how much is noncomp (file cache). i would expect your file cache percent to be VERY high while backing up a filesystem, since aix will notice you keep reading from the same place and will keep increasing the readahead factor to get as much in memory as possible. were you truly swapping (as in "to paging space" was high)?
-----Original Message-----
From: Anthony F. Fiore [mailto:anthony.fiore@NYU.EDU]
Sent: Monday, June 30, 2003 10:18 AM
To: aix-l@Princeton.EDU
Subject: jfs2 & 5.2 any performance issues?
Good Day,
I was wondering if anyone on the list has noticed any performance
issues with JFS2 and AIX 5.2 ML-1, most notably memory issues. The
reason I say this is because when I looked at one of my systems this
morning, it was using 99% of it's memory and starting to swap like crazy
according to nmon64. TSM was backing up a test filesystem at the time,
so I killed the tsm process, and unmounted the jfs2 filesystem and poof!
my memory usage went down to 31.5 percent while the filesystem was being
unmounted. Granted, this is a huge filesystem in the 200 GB range, but
should it really eat up THAT much memory?
TIA,
Anthony
-- Anthony Fiore System Administrator ITS Operations and Production Services New York University anthony.fiore@nyu.edu
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Relevant Pages
- jfs2 & 5.2 any performance issues?
... issues with JFS2 and AIX 5.2 ML-1, most notably memory issues. ... TSM
was backing up a test filesystem at the time, ... Anthony Fiore ... (AIX-L) - Re: JFS2 vs. JFS
... We got bitten by file system corruption when we had jfs2 and inline log. ...
Also went wrong during filesystem expansion. ... Also you need to retune your memory.
... (comp.unix.aix) - AIX 5.2 maxperm & Oracle
... maxperm was set to 63%, ... large volumes of data IO going through the AIX
filesystem cache). ... for memory with filesystem cache. ... (comp.unix.aix) - Re: [00/17] Large Blocksize Support V3
... to lock the filesystem block and prevent any updates to it, ... get 128 pages
into a bio so all we've done churned some in memory ... I/O no faster than the current
code. ... We can't use buffer heads - they can only point ... (Linux-Kernel) - Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE_SIZE)
... but now we waste more memory on small files.... ... allowing us to increase
the fundamental block size of the filesystem. ... _whole_ kernel faster. ...
If I want a inode cache, it always needs to be 8k based. ... (Linux-Kernel)