topic Re: Too Many Open Files error message in Operating System - HP-UX

Too Many Open Files error message

yn_wangchao163.com — Tue, 10 Mar 2009 07:51:35 GMT

Hi,
I received some error message at syslog.log file.

sshd[6409]: error: openpty: Too many open files
sshd[6412]: error: session_pty_req: session 2 alloc failed
sshd[6412]: error: session_pty_req: session 1 alloc failed
sshd[6412]: error: session_pty_req: session 3 alloc failed
sshd[6409]: error: chown 0 0 failed: No such file or directory
sshd[6409]: error: chmod 0666 failed: No such file or directory
sshd[6409]: error: openpty: Too many open files
above message repeats 2 times

Re: Too Many Open Files error message

Steven E. Protter — Tue, 10 Mar 2009 07:58:53 GMT

Shalom,

This would indicate a need to change some kernel parameters:

nfile
maxuprc

SEP

Re: Too Many Open Files error message

Johnson Punniyalingam — Tue, 10 Mar 2009 08:00:30 GMT

you need to tune 'maxfiles' kernal parameter and 'maxfiles_lim'. Check out the manpage.

what OS HPUX version.?

Thanks,
Johnson

Re: Too Many Open Files error message

Steven E. Protter — Tue, 10 Mar 2009 08:14:45 GMT

I agree with the follow on post to mine.

I recommend sam kernel configuration configurable parameters for those who are new with the OS. Sam is replaced with SMH in the 11.31 OS.

SEP

Re: Too Many Open Files error message

Venkatesh BL — Tue, 10 Mar 2009 08:18:42 GMT

You may also want to see if the application is opening files and not closing them (due to a bug)...

Re: Too Many Open Files error message

Avinash20 — Tue, 10 Mar 2009 08:44:08 GMT

At the same time you could check the output of

# sar -v 1 5

This will let us know if the number of files are getting filled, and if the kernel parameters needs to be increased.

Re: Too Many Open Files error message

Kapil Jha — Tue, 10 Mar 2009 08:45:39 GMT

Is this a new server or this problem came suddenly , if this came suddently and nothing was upgraded in server......no application, no DB etc.
Then you have to see which process is opening so many files(if you have lsof it can help you a lot in that).

And if this issue come after any upgrade then you have have to incrase above suggested parameter inclusing the need of that new application.

Don go and change kernel parameter at one instance you gotta see why that happened.

BR,
Kapil+

Re: Too Many Open Files error message

yn_wangchao163.com — Wed, 11 Mar 2009 00:08:09 GMT

Thanks everyone:
I saw maxuprc = 3780 by smh,but I can not find this parameter nfile. My os is HP-UX 11.31.

Re: Too Many Open Files error message

yn_wangchao163.com — Wed, 11 Mar 2009 00:09:44 GMT

# sar -v 1 5

HP-UX pmsdb1 B.11.31 U ia64 03/11/09

09:08:32 text-sz ov proc-sz ov inod-sz ov file-sz ov
09:08:33 N/A N/A 502/4200 0 1484/35648 0 8480/2147483647 0
09:08:34 N/A N/A 505/4200 0 1488/35648 0 8482/2147483647 0
09:08:35 N/A N/A 502/4200 0 1495/35648 0 8480/2147483647 0
09:08:36 N/A N/A 503/4200 0 1484/35648 0 8483/2147483647 0
09:08:37 N/A N/A 503/4200 0 1485/35648 0 8484/2147483647 0

Re: Too Many Open Files error message

Dennis Handly — Wed, 11 Mar 2009 02:05:21 GMT

>I can not find this parameter nfile.

nfile is no longer there on 11.31, so don't worry about it. That was the case where there were too many open files for ALL of the processes, not just the per process limit maxfiles_lim.
http://docs.hp.com/en/B2355-60130/nfile.5.html

Re: Too Many Open Files error message

Dennis Handly — Wed, 11 Mar 2009 02:08:31 GMT

I forgot to mention since you are on 11.31, you can use pfiles(1) to see how many open files there are for that sshd PID 6409, if still there:
pfiles 6409

Re: Too Many Open Files error message

點燃 — Wed, 11 Mar 2009 02:30:01 GMT

please check how many users are logged in to the server through ssh etc and the number of Pseudo Terminals (npty) being used.

You can check this from 'glance'.
Go to glance and press 't' for the system tables report.
If there are any inactive sessions, kill them.

Regards!

Re: Too Many Open Files error message

yn_wangchao163.com — Tue, 17 Mar 2009 02:06:18 GMT

Thanks,
I saw a very large nfile(2147483647) by glance.

Re: Too Many Open Files error message

yn_wangchao163.com — Tue, 17 Mar 2009 02:07:38 GMT

System Table Available Used Utilization High(%)
--------------------------------------------------------------------------------
Proc Table (nproc) 4200 533 13 13
File Table (nfile) 2147483647 6371 0 0
Shared Mem Table (shmmni) 512 16 3 3
Message Table (msgmni) 4200 2 0 0
Semaphore Table (semmni) 8400 30 0 0
File Locks (nflocks) 4200 81 2 2
Pseudo Terminals (npty) 60 0 0 0
Buffer Headers (nbuf) na 11936 na na

Re: Too Many Open Files error message

Dennis Handly — Tue, 17 Mar 2009 03:34:09 GMT

On my 11.31, nfile is 0, so I guess you can ignore it.

What is the value of maxfiles_lim and have you tried pfiles(1)?

Re: Too Many Open Files error message

yn_wangchao163.com — Tue, 17 Mar 2009 05:20:43 GMT

maxfiles_lim=4096

Re: Too Many Open Files error message

Johnson Punniyalingam — Tue, 17 Mar 2009 05:27:20 GMT

how about macfile..?

Thanks,
Johnson

Re: Too Many Open Files error message

yn_wangchao163.com — Tue, 17 Mar 2009 06:38:53 GMT

Thanks,
maxfiles=2048

Re: Too Many Open Files error message

Johnson Punniyalingam — Tue, 17 Mar 2009 06:49:59 GMT

looks ok to me.

# maxfile = 2048
# maxfiles_lim =4096

Thanks,
Johnson

Re: Too Many Open Files error message

Johnson Punniyalingam — Tue, 17 Mar 2009 06:51:10 GMT

you try increasing the "parameter" has suggested earlier.

Thanks,
Johnson