Pascal Gienger wrote:
David Korpiewski <davidk@xxxxxxxxxxxx> wrote:
I spent about 6 months fighting with Apple XSAN and Apple OSX mail to
try
to create a redundant cyrus mail cluster. First of all, don't try
it, it
is a waste of time. Apple states that mail on an XSAN is not supported.
The reason is that it simply won't run. The Xsan can't handle the
large
amount of small files and will do things like disconnect or corrupting
the file system.
STOP!
The capability to handle small files efficiently is related to the
filesystem carrying the files and NOT to the physical and logical
storage media (block device) under it.
Apple is the one confusing people. "XSan" is the name of the Apple
cluster file system. So you configure a couple of hosts on your SAN,
with a shared volume, and then run XSan. XSan is more similar to Linux
GFS (Global File System).
So I believe the original poster is right: XSan is crap for lots of
small files. That is not surprising. It is really hard to come up with
a shared file system that does suck. The nodes have to lock for
meta-data updates. So shared file systems can be pretty slow too.
Tom
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