[Maybe Spam] Re: very high i/o usage

[Nir Cohen]

Hi=20
Sorry for not giving all the details .the os is Red Hat Linux 3.2.3-20
with kernel  2.4.21-4.Elsmp
Here is a top look:

 15:06:50  up 82 days,  3:50,  1 user,  load average: 2.82, 2.92, 2.89
37 processes: 36 sleeping, 1 running, 0 zombie, 0 stopped
CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
           total   34.9%    0.0%    4.1%   0.3%     2.5%   39.0%   19.2%
           cpu00   31.8%    0.0%    4.2%   0.6%     4.6%   41.8%   17.0%
           cpu01   38.0%    0.0%    4.0%   0.0%     0.4%   36.2%   21.4%
Mem:  1028524k av, 1012264k used,   16260k free,       0k shrd,   67064k
buff
                    816252k actv,   25244k in_d,   13988k in_c
Swap: 2097096k av,  528776k used, 1568320k free                   14664k
cached

  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME CPU
COMMAND
 7688 named     24   0  865M 743M  1364 S    38.1 74.0 867:53   1 named
    8 root      15   0     0    0     0 SW    0.3  0.0 688:45   0 kscand
  443 root      15   0     0    0     0 DW    0.2  0.0  12:14   0
kjournald
 1157 root      15   0   268  224   188 D     0.2  0.0   9:29   0
syslogd
    7 root      15   0     0    0     0 SW    0.1  0.0 120:36   1 kswapd
18464 nirc      15   0  1164 1124   912 R     0.1  0.1   0:00   1 top
    1 root      15   0   136   96    80 S     0.0  0.0   1:38   0 init
    2 root      RT   0     0    0     0 SW    0.0  0.0   0:00   0
migration/0
    3 root      RT   0     0    0     0 SW    0.0  0.0   0:00   1
migration/1
    4 root      15   0     0    0     0 SW    0.0  0.0   0:00   0
keventd
    5 root      34  19     0    0     0 SWN   0.0  0.0   0:00   0
ksoftirqd/0
    6 root      34  19     0    0     0 SWN   0.0  0.0   0:00   1
ksoftirqd/1
    9 root      25   0     0    0     0 SW    0.0  0.0   0:00   0
bdflush


The swap usage is all the time growing now its 528776k used but its all
the time growing.


Regards

                     Nir















    Nir> Hello All I have a compaq G2 with 2xcpu 1.4Mhz and 2.0G ram
    Nir> and a bind 9.2.3 installed .  The server is an authorized dns
    Nir> for all our zones we have around 8000 zones(I work for Isp
    Nir> company).  the problem I see on the server is that there is
    Nir> very high i/o usage.  Befor I installed the 9.2.3 version I
    Nir> had the 9.2.3rc4 and 9.3.0rc2 and 9.2.4rc4 versions which
    Nir> worked good for one day and then The cpu usage bacome very
    Nir> high it reched the 100% and I had to restart the server.  Now
    Nir> the cpu not reached the 100% yest but the i/o is very high on
    Nir> both cpu's.  Is it a bind problem ?or maybe hardware problem?

It's impossible to answer this question from the info you've provided
above. You didn't even say what OS you're running. You could start by
telling us what process(es) were responsible for the very high amounts
of disk I/O -- define "very high" -- and CPU utilisation. A system call
trace on these processes might be helpful too.

BIND is very highly unlikely to be I/O bound. Most of the time it will
only be going to disk when loading zone files or writing log entries.
Neither of these things is likely to mean lots of disk I/O. A name
server isn't going to be CPU bound either unless it's getting thousands
of queries per second and/or it's validating DNSSEC-signed replies.

So what this means is your problem is almost certainly nothing to do
with BIND. A mailing list or newsgroup for your OS may be a better forum
for you to ask for assistance.


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