[goetzi]

What can you tell me about your hardware? (Virtual machine?)

No, it's no virtual machine.
It's a PIII 600 Mhz with 386 MB RAM and 18 GB RAID 5 (3 Disks with 9 GB).

Also - can you send me the contents of /var/log/messages between 20:20 and 20:35 on that date?

Feb 27 20:20:08 zimbra crond(pam_unix)[20526]: session opened for user zimbra by (uid=0)
Feb 27 20:20:08 zimbra crond(pam_unix)[20529]: session opened for user zimbra by (uid=0)
Feb 27 20:20:10 zimbra crond(pam_unix)[20527]: session opened for user zimbra by (uid=0)
Feb 27 20:20:10 zimbra crond(pam_unix)[20528]: session opened for user zimbra by (uid=0)
Feb 27 20:20:29 zimbra zimbramon[20558]: 20558:info: 2006-02-27 20:20:26, DISK: : dev: /dev/ida/c0d0p3, mp: /, tot: 16139, ava
il: 5771
Feb 27 20:20:34 zimbra zimbramon[20558]: 20558:info: 2006-02-27 20:20:26, DISK: : dev: /dev/ida/c0d0p1, mp: /boot, tot: 97, av
ail: 81
Feb 27 20:20:37 zimbra crond(pam_unix)[20528]: session closed for user zimbra
Feb 27 20:20:45 zimbra zimbramon[20556]: 20556:info: 2006-02-27 20:20:26, QUEUE: 0 0
Feb 27 20:20:48 zimbra crond(pam_unix)[20526]: session closed for user zimbra
Feb 27 20:20:51 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: antispam: Running
Feb 27 20:20:52 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: antivirus: Running
Feb 27 20:20:52 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: ldap: Running
Feb 27 20:20:53 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: logger: Running
Feb 27 20:20:55 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: mailbox: Running
Feb 27 20:20:55 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: mta: Running
Feb 27 20:20:55 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: snmp: Running
Feb 27 20:20:56 zimbra zimbramon[17100]: 17100:info: 2006-02-27 20:19:13, STATUS: zimbra.glatter-goetz.de: spell: Running
Feb 27 20:20:54 zimbra crond(pam_unix)[15857]: session closed for user zimbra
Feb 27 20:21:15 zimbra crond(pam_unix)[20755]: session opened for user zimbra by (uid=0)
Feb 27 20:22:25 zimbra crond(pam_unix)[20794]: session opened for user zimbra by (uid=0)
Feb 27 20:23:53 zimbra crond(pam_unix)[20804]: session opened for user zimbra by (uid=0)
Feb 27 20:24:32 zimbra crond(pam_unix)[20871]: session opened for user zimbra by (uid=0)
Feb 27 20:26:19 zimbra crond(pam_unix)[20926]: session opened for user zimbra by (uid=0)
Feb 27 20:28:59 zimbra crond(pam_unix)[20940]: session opened for user zimbra by (uid=0)
Feb 27 20:29:34 zimbra crond(pam_unix)[20945]: session opened for user zimbra by (uid=0)
Feb 27 20:30:47 zimbra kernel: oom-killer: gfp_mask=0x1d2
Feb 27 20:30:51 zimbra kernel: Mem-info:
Feb 27 20:30:51 zimbra kernel: DMA per-cpu:
Feb 27 20:30:51 zimbra kernel: cpu 0 hot: low 2, high 6, batch 1
Feb 27 20:30:51 zimbra kernel: cpu 0 cold: low 0, high 2, batch 1
Feb 27 20:30:51 zimbra kernel: Normal per-cpu:
Feb 27 20:30:51 zimbra kernel: cpu 0 hot: low 32, high 96, batch 16
Feb 27 20:30:51 zimbra kernel: cpu 0 cold: low 0, high 32, batch 16
Feb 27 20:30:51 zimbra kernel: HighMem per-cpu: empty
Feb 27 20:30:51 zimbra kernel:
Feb 27 20:30:51 zimbra kernel: Free pages:         592kB (0kB HighMem)
Feb 27 20:30:51 zimbra kernel: Active:9098 inactive:37654 dirty:0 writeback:0 unstable:0 free:148 slab:22514 mapped:46423 page
tables:25807
Feb 27 20:30:51 zimbra kernel: DMA free:24kB min:24kB low:48kB high:72kB active:212kB inactive:280kB present:16384kB pages_sca
nned:2994 all_unreclaimable? yes
Feb 27 20:30:54 zimbra kernel: protections[]: 0 0 0
Feb 27 20:30:57 zimbra kernel: Normal free:568kB min:596kB low:1192kB high:1788kB active:36180kB inactive:150336kB present:376
816kB pages_scanned:328267 all_unreclaimable? yes
Feb 27 20:30:59 zimbra kernel: protections[]: 0 0 0
Feb 27 20:31:02 zimbra kernel: HighMem free:0kB min:128kB low:256kB high:384kB active:0kB inactive:0kB present:0kB pages_scann
ed:0 all_unreclaimable? no
Feb 27 20:31:06 zimbra kernel: protections[]: 0 0 0
Feb 27 20:31:08 zimbra kernel: DMA: 6*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 24kB
Feb 27 20:31:09 zimbra kernel: Normal: 0*4kB 1*8kB 3*16kB 0*32kB 0*64kB 4*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 5
68kB
Feb 27 20:31:12 zimbra kernel: HighMem: empty
Feb 27 20:31:13 zimbra kernel: Swap cache: add 304430, delete 304430, find 16703/26938, race 0+4
Feb 27 20:31:13 zimbra kernel: 0 bounce buffer pages
Feb 27 20:31:15 zimbra kernel: Free swap:            0kB
Feb 27 20:31:17 zimbra kernel: 98300 pages of RAM
Feb 27 20:31:18 zimbra kernel: 0 pages of HIGHMEM
Feb 27 20:31:19 zimbra kernel: 1784 reserved pages
Feb 27 20:31:19 zimbra kernel: 11076 pages shared
Feb 27 20:31:20 zimbra kernel: 0 pages swap cached
Feb 27 20:31:22 zimbra kernel: Out of Memory: Killed process 20633 (java).
Feb 27 20:31:29 zimbra crond(pam_unix)[20957]: session opened for user zimbra by (uid=0)
Feb 27 20:31:29 zimbra crond(pam_unix)[20951]: session opened for user zimbra by (uid=0)
Feb 27 20:31:29 zimbra crond(pam_unix)[20948]: session opened for user zimbra by (uid=0)
Feb 27 20:33:32 zimbra crond(pam_unix)[20958]: session opened for user zimbra by (uid=0)
Feb 27 20:35:44 zimbra kernel: oom-killer: gfp_mask=0x1d2
Feb 27 20:35:44 zimbra kernel: Mem-info:
Feb 27 20:35:44 zimbra kernel: DMA per-cpu:
Feb 27 20:35:44 zimbra kernel: cpu 0 hot: low 2, high 6, batch 1
Feb 27 20:35:44 zimbra kernel: cpu 0 cold: low 0, high 2, batch 1
Feb 27 20:35:44 zimbra kernel: Normal per-cpu:
Feb 27 20:35:44 zimbra kernel: cpu 0 hot: low 32, high 96, batch 16
Feb 27 20:35:44 zimbra kernel: cpu 0 cold: low 0, high 32, batch 16
Feb 27 20:35:44 zimbra kernel: HighMem per-cpu: empty
Feb 27 20:35:44 zimbra kernel:
Feb 27 20:35:44 zimbra kernel: Free pages:         568kB (0kB HighMem)
Feb 27 20:35:44 zimbra kernel: Active:156 inactive:46434 dirty:0 writeback:0 unstable:0 free:142 slab:22517 mapped:46309 paget
ables:25835
Feb 27 20:35:44 zimbra kernel: DMA free:24kB min:24kB low:48kB high:72kB active:368kB inactive:124kB present:16384kB pages_sca
nned:1246 all_unreclaimable? yes
Feb 27 20:35:46 zimbra kernel: protections[]: 0 0 0
Feb 27 20:35:51 zimbra kernel: Normal free:544kB min:596kB low:1192kB high:1788kB active:256kB inactive:185612kB present:37681
6kB pages_scanned:859980 all_unreclaimable? yes
Feb 27 20:36:08 zimbra kernel: protections[]: 0 0 0
Feb 27 20:36:08 zimbra crond(pam_unix)[20964]: session opened for user zimbra by (uid=0)
Feb 27 20:36:08 zimbra crond(pam_unix)[20960]: session opened for user zimbra by (uid=0)
Feb 27 20:36:12 zimbra kernel: HighMem free:0kB min:128kB low:256kB high:384kB active:0kB inactive:0kB present:0kB pages_scann
ed:0 all_unreclaimable? no
Feb 27 20:36:12 zimbra crond(pam_unix)[20974]: session opened for user zimbra by (uid=0)
Feb 27 20:36:12 zimbra crond(pam_unix)[20979]: session opened for user zimbra by (uid=0)
Feb 27 20:36:12 zimbra crond(pam_unix)[20970]: session opened for user zimbra by (uid=0)
Feb 27 20:36:12 zimbra crond(pam_unix)[20982]: session opened for user zimbra by (uid=0)
Feb 27 20:36:12 zimbra crond(pam_unix)[20977]: session opened for user zimbra by (uid=0)
Feb 27 20:36:13 zimbra crond(pam_unix)[20956]: session opened for user zimbra by (uid=0)
Feb 27 20:36:14 zimbra kernel: protections[]: 0 0 0
Feb 27 20:36:15 zimbra kernel: DMA: 6*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 24kB
Feb 27 20:36:17 zimbra kernel: Normal: 0*4kB 0*8kB 2*16kB 0*32kB 0*64kB 4*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 5
44kB
Feb 27 20:36:17 zimbra kernel: HighMem: empty
Feb 27 20:36:18 zimbra kernel: Swap cache: add 307028, delete 307028, find 17081/27658, race 0+19
Feb 27 20:36:24 zimbra kernel: 0 bounce buffer pages
Feb 27 20:36:28 zimbra kernel: Free swap:            0kB
Feb 27 20:36:43 zimbra zimbramon[20986]: 20986:info: 2006-02-27 20:36:19, DISK: : dev: /dev/ida/c0d0p3, mp: /, tot: 16139, ava
il: 5771
Feb 27 20:36:31 zimbra kernel: 98300 pages of RAM
Feb 27 20:36:33 zimbra kernel: 0 pages of HIGHMEM
Feb 27 20:36:34 zimbra kernel: 1784 reserved pages
Feb 27 20:36:34 zimbra kernel: 11098 pages shared
Feb 27 20:36:34 zimbra kernel: 0 pages swap cached

May it be a problem with my memory ("zimbra kernel: Out of Memory: Killed process 20633 (java).")?
I know that 386 MB isn't very much, but it always worked right (I only have 3 users on my system at the moment).

(It looks like you reduced the frequency of status checking in the crontab - is that correct?)

No, I didn't do anything there.

Also - did you have any DNS problems around this time?

Not that I know. All other things worked well at this time.