>I just loaded a 30 day eval version of PerfectDisk 2000 (www.raxco.com) and
>have been impressed so far with it's defrag performance. Does anyone else
>have experience with it?
no, but I tried oo defrag from oo-software.de and it completely defragged my
ThinkPad. so far so good. Most importantly, it�s gotta cool display.
I have to agree that Diskkeeper�s reputation is bigger than its performance
(and it�s display isn�t cool :))) ). I could never get it to defrag my
NT4 disk partition with my Eurdora mailbox, horribly fragmented. It would
just give up, saying "too many fragments" (I mean, WTF kinda problem is
that for a defragger?? and what am I supposed to do about it now? Isn�t
that the problem I paid Diskkeeper to fix? )
This defragging issue of biggish mail servers is another reason why the
"engineering" of the mail server is important to the mailserver�s longterm
performance and maintainability. Trying to defrag 6 gb of mailboxes isn�t
fun.
specifically, disk partitioning and disk channels.
one partition for programs, 4 gb, probably never needs defragging after
install.
one partition for imail mailq, dedicated, "1 gb otta be enough for
anybody", this gets horribly trafficked with in and out of every single msg
and attachment and severely fragmented. number of dead files in the
\spool dir to be kept to minimum with ispclean. log files to be compressed
and copied to another system.
one partition for mailboxes
other partitions for mailboxes.
mailbox slowness due to disk i/o, badly aggravated by IMAP, can really slow
the users' perception of the system. Frequent defragging required.
Another (unsolvable) problem is the lack of hashed mailbox
directories. Having 25K user dir�s under one domain dir is just as slow
has having 25k files in one dir.
Len
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