[CentOS] Large scale Postfix/Cyrus email system for 100,000+ users
Les Mikesell
lesmikesell at gmail.com
Thu Oct 25 02:28:23 UTC 2007
Christopher Chan wrote:
>>>
>>> The service provider I used to work for tried openldap in 98. They
>>> got burned big time. Maybe it is up to the task today. What kind of
>>> hardware, though, would you use for one that the OP indicates will
>>> get a lot of writes? Everything I have read says LDAP is not for high
>>> write problems.
>>
>> 1998 was a long time ago. Red Hat (fedora) directory server has
>> claimed good performce for several years now.
>> http://directory.fedoraproject.org/
>
> Yeah, well, I guess the Fedora Directory server is unlikely to drop its
> entire datastore and will actually keep running but hey, are you going
> to migrate back to ldap if you have a system that is distributed across
> different mysql boxes running on cheap boxes and does its job?
Yes, I've had enough trouble with mysql that I'd look for any
alternative, but to be far that was a few years back too.
>> But the openldap guys think they are better - see page 33 of the pdf
>> linked from this page:
>> http://www.mail-archive.com/ldap@umich.edu/msg01151.html
>> (22000 queries/sec, 4800 updates/sec on a terabyte database with 150
>> million entries - but I think the test box had 480Gigs of RAM...)
>
> There you go. If you have the hardware, you can do openldap. 480Gigs?
> Did you add an extra zero?
I copied it from this email post.
http://www.redhat.com/archives/fedora-directory-users/2007-July/msg00113.html
>>>> Does anyone have enough faith in a free NFS server to use it in this
>>>> scenaro these days? How about opensolaris on top of zfs?
>>>>
>>>
>>> I would say. No comment on opensolaris in this scenario but I am
>>> happy with zfs as an offsite online backup solution.
>>
>> Are you using the incremental send/receive operation for this?
>>
>
> Huh? This is just rsync for the vpopmail maildir, user home directories,
> pervasive database files and scp for an Exchange backup file and then
> snapshotting on the zfs volume for the vpopmail and user home
> directories. Nothing heavy. What is this incremental send/receive
> operation that you are talking about?
zfs has the ability to make filesystem snapshots, then back them up with
a send/receive operation. See bottom of this page
http://docs.sun.com/app/docs/doc/819-5461/ftyxi?a=view. I haven't used
it myself but it sounds handy.
--
Les Mikesell
lesmikesell at gmail.com
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