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List:       linux-kernel
Subject:    Linux halt/crash with imap server
From:       Benjamin Suto <ben () amvalue ! com>
Date:       1999-08-05 19:37:03
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We're running Linux 2.2.9 on a Samba, Imap, Sendmail, DNS, Web, etc.,
server for over 100 users.  The system usually runs fine, but has been
crashing quite often recently.   The machine completely locks and no
longer responds to pings when the problem happens.  It's a Dell
Poweredge with the MegaRAID PERC controllers.  We have 512MB Ram on it
and have notched up the number of file handles and some other buffer
related information in order to speed up the Samba server.

We've got an automated user, called report, that logs in to the server,
and retrieves items from the sent folder (which is 280 MB in size), and
sends and receives messages quite often.  This imapd process can grow to
very huge sizes. After running top on the server, it seems that the
system tends to crash when trying to get the messages from that folder.  

After a couple of crashes, I telnetted into the system and ran vmstat to
get an idea of what's going on.  The output right before the crash is
below:

Does anyone have any hints or ideas to avoid these crashes?  We're
thinking of moving everything over to an IBM AIX RS/6000 machine (at
least for the report user) if we can't find a solution to this
problem.   

If you reply, please CC me, since I cannot always follow the linux
kernel mailing list.  Thanks.

   procs                      memory    swap          io    
system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us 
sy  id
 1  0  0    988   1528 109092 282836   0   0  6260    26  679   458  10 
12  78
 1  0  0    988   2856 185988 203228   0   0     9   204  418   448  13 
49  38
 0  1  0    988   2788 213396 173440   0   0   463  3208  337   344   7 
21  72
 1  0  0    988   2320 239648 145556   0   0   129  2905  304   347   4 
19  77
 0  1  0    988   2616 253068 130036   0   0    28  3700  290   293   3 
16  81
 0  3  0    988   1608 254084 129868   6   0   148  3803  303   301   3 
15  82
 0  1  0    988   2724 266024 116196   0   0    38  3302  293   252   3 
14  83
 2  1  0    988   2808 253632 128416   0   0    11  4400  256   262   3 
12  86
 0  1  0    988   3164 259460 122356   0   0    27  4100  280   194   4 
14  83
 0  1  0    988   2916 276592 104648   0   0    13  4400  268   267   2 
14  84
 0  2  0    988   2820 268216 112724   0   0    21  4200  266   245   3 
14  83
 0  1  0    988   3176 264492 115812   0   0   139  1600  265   272  
3   8  89
 0  3  0    988 111136 264492   7840   0   0    28  2128  377   482  
3   7  90
 0  6  0    988 110144 264492   8072   8   0    44  4952  382   546  
4   8  88
 0  9  0    988 109828 264492   8164   0   0    17  5715  577   974  
5   7  89
 0  8  0    988 109988 264492   8240   0   0    17  4703  353   472  
3   6  91
 0  5  0    988 110528 264492   8340   0   0    20  5673  350   474  
3   9  88
 0  9  0    988 109124 264492   8340   0   0     0  3946  355   584  
3   6  92
 0 15  0    988 108672 264492   8340   0   0     1  3611  436   712  
3   5  91
 0 15  0    988 108672 264492   8340   0   0     0  3615  408   661  
2   6  92

Thanks for your help,

Ben

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