High availability email server...
tom at sdf.com
Sat Jul 29 15:22:14 EDT 2006
Pascal Gienger wrote:
> David Korpiewski <davidk at cs.umass.edu> wrote:
>> I spent about 6 months fighting with Apple XSAN and Apple OSX mail to
>> 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
>> amount of small files and will do things like disconnect or corrupting
>> the file system.
> 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.
More information about the Info-cyrus