On Wed, 27 Jun 2012, Javier Sánchez-Arévalo Díaz wrote:
I have a email server with two local partitions for mailboxes ("default" and
"part2"). Recently these partitions became almost full so I decided create a
new partition over a NFS mountpoint and migrate all the mailboxes to this new
partition ("part3").
The target is to move all the mailboxes to "part3" in order to leave
"default" and "part2" completely empty. Once this is done I want to stop
using them ("default" and "part2") and remove physically the hardisks where
they are in order to plug new bigger disks.
After moving all the mailboxes to "part3" everything is working fine but,
before removing "default" and "part2", I would like to make a question:
The question is. How I can be completely sure that I can do it safely?
I have done the next tests but I would prefer to ask to experts like you
before doing It. Its a production server with almost 20000 mailboxes:
// list of partitions
pcocol01:~ # cat /etc/imapd.conf | grep -i part
partition-default: /buzonesdir
partition-part2: /mnt/aux
partition-part3: /mnt/celerra
defaultpartition: part3
============================================================
// mount points of these partitions
pcocol01:~ # mount
/dev/cciss/c0d1p1 on /buzonesdir type reiserfs (rw,acl,user_xattr)
/dev/sdb1 on /mnt/aux type ext3 (rw)
212.145.146.8:/FS_AUX/FS_AUX on /mnt/celerra type nfs (rw,addr=212.145.146.8)
============================================================
// Check that nobody is using "default" and "part2"
pcocol01:~ # fuser -m /mnt/aux/
pcocol01:~ #
pcocol01:~ # fuser -m /buzonesdir/
pcocol01:~ #
pcocol01:~ # fuser -m /mnt/celerra
/mnt/celerra: 6488cm 7467cm 7500cm 7501cm 7504cm 7505cm 7507cm
7508cm 7513cm 7514cm 7515cm 7519cm 7549cm 7565cm 7567cm 7573cm 7596cm
7607cm 7623cm 7624cm 7625cm 7626cm 10513c 10521cm 10527cm 24266cm 26056cm
10233cm 32528cm 26829cm 7667cm 13155cm 5872cm 6020cm 27926cm 27931cm
27935cm 28826cm 4689cm 4874cm 5893cm 5895cm 6389cm 6446cm 7286cm
7407cm 7509cm 8716cm 8884cm 8889cm 29283cm 14523cm 3771cm 3772cm 3613cm
13822cm 22701c 16272cm 11921c 7069c 28817cm 12127cm 28148cm 11318cm 801cm
1052c 3823c 8338cm 9092cm 9883c 13770cm 19410cm 20014cm 20956cm 24031c
24371cm 25054cm 25827c 27930c 31191cm 31542cm 31612c 31701cm 31829cm 32249cm
32357cm 32374cm 32400cm 32462c 1274c 1289c 1756c 1956cm 2260cm 7039c
7506cm 7613cm 7883cm 7949cm 7956cm 8069c 8445cm 8540c 8611c 9297cm
9495cm 11116cm 14525cm 15235cm 16589cm 19732cm 20811cm 20960cm 21215cm
21309cm 21606cm 21667cm 22861cm 22878cm 23179c 23222cm 23305cm 23308cm 23321c
23364cm 23492c 23550c 23557cm 23599cm 23610cm 23616cm 23758cm 23870cm 24103cm
24144cm 24154cm 24195cm 24200cm 24257cm 24432cm 24748cm 25025cm 25027cm
25159cm 25160cm 25171cm 25175cm 25190cm 25428cm 25429cm 25484cm 25487cm
25650cm 25688cm 25923cm 25955cm 25962cm 25968cm 25969cm 26293cm 26482cm
26529c 26532cm 26534cm 26603cm 26640cm 26649cm 26691cm 26760c 26761cm 26851cm
26866cm 26891cm 26919cm 26922cm 26935cm 26961cm 27123cm 27208cm 27281cm
27350cm 27422cm 27432cm 27498cm 27639cm 27640c 27735cm 27741cm 27778cm
27839cm 27865cm 27868cm 27909cm 27928cm 28018cm 28064cm 28170cm 28198cm
28201cm 28226cm 28241cm 28258c 28295cm 28315cm 28340cm 28343cm 28348cm
28371cm 28379cm 28606c 28640cm 28641c 28642c 28646cm 28654cm
pcocol01:~ #
============================================================
//list of mailboxes to be sure that none is located in "default" or "part2"
cyrus@pcocol01:~> ctl_mboxlist -d | wc -l
75444
cyrus@pcocol01:~> ctl_mboxlist -d -p default | wc -l
0
cyrus@pcocol01:~> ctl_mboxlist -d -p part2 | wc -l
0
cyrus@pcocol01:~> ctl_mboxlist -d -p part3 | wc -l
75444
These results from ctl_mboxlist show me that no mailboxes reside on
"default" or "part2" partitions.
============================================================
// Contents of "default" and "part2" partitions
pcocol01:~ # ls -l /buzonesdir/
total 0
drwx------ 2 cyrus mail 448 2012-06-20 13:32 stage.
drwxr-xr-x 2 cyrus mail 48 2012-06-27 08:37 user
cyrus@pcocol01:~> ls -l /buzonesdir/user/
total 0
cyrus@pcocol01:~> ls -l /buzonesdir/stage./
total 2094
-rw------- 1 cyrus mail 8288 2012-04-26 12:25 10770-1335435917-0
-rw------- 1 cyrus mail 69557 2007-10-04 17:05 13569-1191510346-0
-rw------- 1 cyrus mail 630968 2007-11-12 08:33 17067-1194852808-0
-rw------- 1 cyrus mail 969 2010-06-27 21:15 23403-1277666141-1
-rw------- 1 cyrus mail 3054 2012-05-16 08:07 24524-1337148471-0
-rw------- 1 cyrus mail 3063 2012-05-16 08:07 24530-1337148469-0
-rw------- 1 cyrus mail 3004 2012-05-16 08:07 24539-1337148470-0
-rw------- 1 cyrus mail 1564 2010-06-26 18:25 27236-1277569504-1
-rw------- 1 cyrus mail 1397725 2007-09-28 13:20 32238-1190978409-0
-rw------- 1 cyrus mail 3457 2007-09-28 13:19 32461-1190978393-0
These are probably junk. The .stage directory is used to hold messages
temporarily during delivery. Sometimes if there was a problem during
delivery they will get stuck here. You can view the files to see what
messages are contained in there. Perhaps you want to check if they were
delivered, at least for the recent ones.
pcocol01:~ # ls -l /mnt/aux/
total 28
drwx------ 2 root root 16384 2012-04-26 09:24 lost+found
drwx------ 2 cyrus mail 4096 2012-06-05 13:18 stage.
drwxr-xr-x 2 cyrus mail 4096 2012-06-27 10:49 user
pcocol01:/mnt/aux/stage. # ls -l /mnt/aux/stage./
total 0
pcocol01:~ # ls -l /mnt/aux/user/
total 0
============================================================
As far as I know It looks like that everything is ready for removing the
partitions
but I have read that also might not be any "old partition entry" in
mailboxes.db and I have this results:
pcocol01:/var/lib/imap # strings mailboxes.db | grep default | more
0 default anyone lrs
0 default 12546 lrswipcda
'0 default 12546 lrsipd cyrus lrswipcda
'0 default 12546 lrsipd cyrus lrswipcda
$0 default 15311tasaciones lrswipcda
10 default 15311tasaciones lrsipd cyrus lrswipcda
10 default 15311tasaciones lrsipd cyrus lrswipcda
0 default 16827 lrswipcda
'0 default 16827 lrsipd cyrus lrswipcda
'0 default 16827 lrsipd cyrus lrswipcda
0 default a22709 lrswipcda
(0 default a22709 lrsipd cyrus lrswipcda
(0 default a22709 lrsipd cyrus lrswipcda
0 default abosqued lrswipcda
*0 default abosqued lrsipd cyrus lrswipcda
*0 default abosqued lrsipd cyrus lrswipcda
0 default abrarq lrswipcda
(0 default abrarq lrsipd cyrus lrswipcda
(0 default abrarq lrsipd cyrus lrswipcda
0 default acgdev lrswipcda
[...]
pcocol01:/var/lib/imap # strings mailboxes.db | grep part2
pcocol01:/var/lib/imap #
Is there any problem with "default" partition?
I think using "strings mailboxes.db" is misleading. If you want to view
the whole mailboxes.db file, just dump it in plaintext format using
"ctl_mboxlist -d > somefile".
Do you know any other test to do before the removal?
Looks ready to me!
Andy
----
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