How to be sure that I can remove a mailbox partition
Javier Sánchez-Arévalo Díaz
javier.sanchez at coam.org
Wed Jul 4 06:11:10 EDT 2012
On 28/06/2012 1:26, Andrew Morgan wrote:
> 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 at pcocol01:~> ctl_mboxlist -d | wc -l
>> 75444
>> cyrus at pcocol01:~> ctl_mboxlist -d -p default | wc -l
>> 0
>> cyrus at pcocol01:~> ctl_mboxlist -d -p part2 | wc -l
>> 0
>> cyrus at 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 at pcocol01:~> ls -l /buzonesdir/user/
>> total 0
>> cyrus at 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!
I tried It and It worked perfectly
Thank you!
>
> Andy
--
*Javier Sánchez-Arévalo*
Dpto. de Informatica
web:*www.coam.es* <http://www.coam.es>
mail:*javier.sanchez at coam.org* <mailto:javier.sanchez at coam.org>
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