Thanks much to you both for your comments and suggestions. We had
already considered creating a temporary "staging" partition and
shuffling mailboxes around, as Michael discussed, but have the same
reservations about it. Since we're dealing with nearly 6TB of data,
most of it old, this scheme would introduce considerable disruption to a
very active mail system. We have a hard time getting a two hour
maintenance window, and this would take days!
Bron, other Fastmailers, any thoughts??
-nic
On 11/03/2017 11:20 AM, Michael Menge wrote:
Hi,
Quoting Reinaldo Gil Lima de Carvalho <reinaldoc@xxxxxxxxx>:
I think that singleinstancestore (message hard links) will not
survive when
moving from one partition to the other and storage total size will
increase
significantly.
thanks for the hint. This was not a problem while migration to the
meta-data partition,
as the mails stayed on the same partition (as in file-system and not
cyrus-partition)
and only hardlinks where change at all.
So one more reason for an other migration path.
2017-11-03 12:22 GMT-03:00 Michael Menge
<michael.menge@xxxxxxxxxxxxxxxxxxxx
:
Hi Nic,
Quoting Nic Bernstein <nic@xxxxxxxxxxx>:
Friends,
I have a client with Cyrus 2.5.10 installed. Last year we migrated
their
old 2.3.18 system to 2.5.10, with an eye towards an eventual move to
3.0.x. Based on Bron's most excellent email of last year,
([Subject: Cyrus
database and file usage data] from Cyrus Devel of 8 January 2016)
we used a
tiered layout for the storage:
The main categories are:
* Config directory (ssd) [/var/lib/imap]
o sieve
o seen
o sub
o quota
o mailboxes.db
o annotations.db
* Ephemeral [/var/run/cyrus -- in tmpfs]
o tls_sessions.db
o deliver.db
o statuscache.db
o proc (directory)
o lock (directory)
* Mailbox data [typical 2.5.X usage]
o Meta-data (ssd)
+ header
+ index
+ cache
+ expunge
+ squat (search index)
+ annotations
o Spool data (disk: raidX)
+ messages (rfc822 blobs)
We sized the Fast SSD pool (this is three-drive mirrors on ZFS) to be
extra large, so it could eventually handle "Hot" data, and left
about 300GB
free there. Data, on spinning media, is currently 5.74TB with
4.8TB free
(RAID10). Metadata is 35GB and /var/lib/imap is 8GB, all of which
is in
the Fast pool.
Now the client is ready to take the dive into v3.0, and I'm trying to
figure out how to put "archive" operation in effect.
I have read the documentation (hell, I wrote most of it) and
understand
the settings, but what I cannot quite wrap my brain around is this:
There
is already all of this data sitting in all of these data partitions
(we use
a total of 34 separate partitions each for data & metadata) so how
do I
make the transition to separate archive partitions, since all that
data is
on the "slow" drives? Can I just reassign all of the current data
partitions to archivedata partitions, define the new set of "Hot" data
partitions on the Fast pool, and let 'er rip, or what?
I promise, if you tell me, I'll write it up as real documentation. :-)
We are interested in such a migration too. Our fallback plan, if we
don't
find a
better way to do it is, do use the same method as we introduced the ssd
meta-data
partition.
1. We created a new partition in our cyrus configuration,
2. we moved moved the accounts from one partition to the other one
by one.
3. (this will be new for the archive partition) run cyrus expire to
move
the old mails back to the slow disks.
This method will have two downsides.
1. we have to copy all mails to the fast storage, and move the old
mails
back to the slow storage. So we have to move most of the mails
twice.
2. the path of the old mail will change so they will be stored again in
our file based backup
so a method without these downsides will be appreciated
Regards
Michael
------------------------------------------------------------
--------------------
M.Menge Tel.: (49) 7071/29-70316
Universität Tübingen Fax.: (49) 7071/29-5912
Zentrum für Datenverarbeitung mail:
michael.menge@xxxxxxxxxxxxxxxxxxxx
Wächterstraße 76
72074 Tübingen
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--------------------------------------------------------------------------------
M.Menge Tel.: (49) 7071/29-70316
Universität Tübingen Fax.: (49) 7071/29-5912
Zentrum für Datenverarbeitung mail:
michael.menge@xxxxxxxxxxxxxxxxxxxx
Wächterstraße 76
72074 Tübingen
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--
Nic Bernstein nic@xxxxxxxxxxx
Onlight Inc. www.onlight.com
6525 W Bluemound Rd., Ste 24 v. 414.272.4477
Milwaukee, Wisconsin 53213-4073 f. 414.290.0335
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