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Lotus NutBlog Authors: Chris Whisonant |
Fragmentation and Domino
Chris Whisonant |
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Tags:
fragmentation
administration
file_system
domino
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Comments (7)
Over at IdeaJam, someone posted an idea on
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1 Tim Tripcony Permalink I'm curious what others' take is on fragmentation in Linux as well... from what I've seen so far, public opinion is that Linux file systems handle block allocation so ideally that defrag is essentially unnecessary, but I have a hard time believing that. Granted, since switching my server at home to Suse, the performance and reliability gains have been undeniable, but on a heavily utilized Domino server, is defragmenting truly unnecessary just because it's running on Linux?
2 Chris Whisonant Permalink Good question Tim. If you look at the 2nd comment at the Idea Jam I linked to above, you can see that someone was having fragmentation problems on Linux. Like I said, NO file system is impervious to fragmentation. Some may handle it better than others, but you're dealing with bits and bytes. And unless the file system leaves chunks of free space between each file and then adds new data into that free space, then it will have to add the data elsewhere on the drive (some would call these fragments of data...).
Even the impenetrable i5/OS has the STRDSKRGZ command to reorg the
disk. But most people may not notice the fragmentation on SAN/NAS
or the mid-range/mainframe platforms because of the number of disk
arms. But this doesn't mean that they are impervious to
fragmentation. Sure some of them may be somewhat proactive in
handling the fragmentation, but that doesn't mean that they don't
fragment (the admins/users just don't notice it).
3 Richard H. Schwartz Permalink Years ago, I realized that compact and defrag are natural enemies, unless you use them carefully.
As you have noted, aggressive defrag and aggressive compact
together guarantee that rapid re-fragmentation starts immediately
after de-fragmentation. And once the largest database size exceeds
the largest free block on a volume, a rapid downward spiral occurs
if you are using copy-style compact.
Careful use of defrag and compact basically means this: run compact
only immediately following a successful defrag; and to insure that
defrag is successful make sure that you have sufficient free space
on the volume so that your defrag will create a contiguous free
block as large as your N largest databases combined. (N is up to
you to decide on, but the higher the better.)
I like your suggestion for a +10 argument to go with -c. I like it
a lot, actually. Put it on IdeaJam and let me know, so I remember
to vote on it.
4 Chris Whisonant Permalink Richard, a few months ago I actually found an OLD post from you sometime back in the 6/7 or 4/5 forum - but I can't seem to find it now. It helped me out a lot on some thoughts on fragmentation - very good info. Also, have you read Daniel's post in the NEXT forum on fragmentation? Very good stuff there and in the replies.
I posted an Idea on this +10 thing:
http://ideajam.net/IdeaJam/P/ij.nsf/0/D007A96ABD0EC28F862573F00075D18D?OpenDocument
5 Fabien Menigault Permalink Very Interesting Post ! personally i defrag often as possible to increase performance playing Crysis .-p
More seriously, most of us when we format a partition, we use the
default allocation unit size ( 4096 )
What would be the better choice for Domino ?
512,1024,2048,4096,8192, 16ko, 32ko, 64ko
This, also has his role to play, i guess
++
6 Nathan T Freeman Permalink Made an idea linked to yours, Chris.
How about if I could just set a FIXED size on the NSF? Then
fragmentation of the file goes away.
Domino already has quota management, so there's a management
process in place to help admins do it.
http://ideajam.net/IdeaJam/P/ij.nsf/0/B3C64CE60BEC57AE862573F1001CBE0E?OpenDocument
7 Chris Whisonant Permalink Nathan, I saw that Idea - going over to promote it now. That's a really great idea as well!! :)