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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