topic Re: swap space problem in Operating System - HP-UX

swap space problem

Hoang Minh Tuan — Fri, 10 Dec 2004 22:50:33 GMT

Hi all,
I have a problem about my server HP9000 A500 HP-UX. I dont no why when I start my server to level 3, after 2 or 3 minutes I can not execute any command and it display in the console message " sh: can not fork: no swap space". and sometimes it give out message " resetting SCSI : lbolt ..."
I created another swap space in vg01 (default is vg00) but it stay the same.
Do you have any recommendation or guides. Your clues is many thanks.
Regards.

Re: swap space problem

bhavin asokan — Fri, 10 Dec 2004 23:28:05 GMT

hi,

try lvlnboot -v command.is it showing like following(having lvol2 as swap).

/dev/dsk/c1t2d0 (0/0/1/1.2.0) -- Boot Disk
/dev/dsk/c2t2d0 (0/0/2/0.2.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c1t2d0
/dev/dsk/c2t2d0
Root: lvol3 on: /dev/dsk/c1t2d0
/dev/dsk/c2t2d0
Swap: lvol2 on: /dev/dsk/c1t2d0
/dev/dsk/c2t2d0
Dump: lvol2 on: /dev/dsk/c2t2d0, 0

if not try
#lvlnboot -s /dev/vg00/lvol2

if it is not solving problem post the output of swapinfo -t

regds,

Re: swap space problem

Suraj_2 — Sun, 12 Dec 2004 02:08:28 GMT

Hi

resetting SCSI:lbolt..seems to be some hard disk problem..

Check the errors in syslog.log files
(/var/adm/syslog/syslog.log)

Rgds
Suraj

Re: swap space problem

Hoang Minh Tuan — Mon, 13 Dec 2004 04:23:04 GMT

I used command lvlnboot -v: it 's OK with the same as you show above (excepted it 's not mirrored)so that my server has swap on lvol2.
An abnormal signal is that I has created second swap space in vg01 and up it to run level 3 but after 2 to 3 minutes, I can't do any commands (eg. bdf, ls, pvdisplay) and it only show on console
" sh: can not fork: no swap space
Error reading from the input file (205) read() returned error code 5 - I/O error. Check your input parameters and try again. Current input file position (in bytes): 34745"
and then server automatically dump.

Re: swap space problem

Fred Ruffet — Mon, 13 Dec 2004 04:47:29 GMT

What does swapinfo -tam tells ?
what is content of /etc/fstab ?

Regards,

Fred

Re: swap space problem

Massimo Bianchi — Mon, 13 Dec 2004 06:00:43 GMT

Hi,
try to start in single user, a to determine what is consuming memory.

Stop it at boot, and issue

hpux -is ....

Then,
think:

did you installed anything ?

did you changed some kernel parameter ?

did you increased, for example, and oracle SGA ?

What is the content of your rc.log ? Maybe there a re some clues, some strange process starting...

HTH,
Massimo

Re: swap space problem

Hoang Chi Cong_1 — Mon, 13 Dec 2004 23:02:47 GMT

Hi Tuan.

I quite agree with Massimo Bianchi.
It seems that there some strange processes is running...
You can check from GlancePlus to determine whether strange process.
Could you show me the output for the swapinfo -a command?
Post again!

Best and regard,

Jimkery

Re: swap space problem

Steven E. Protter — Mon, 13 Dec 2004 23:08:56 GMT

lbolt has two causes that I know of:

1) A disk has failed. If you have swap on it that pretty much explains everything.

2) You recently replaced a hot-swapable disk. That lbolt will stay around until next boot.

I suggest, based on circumstances a reboot in short order. If that doesn't clear the lbolt, take a look at some disk reports and see if swap was sitting on the missing disk.

strings /etc/lvmtab

then pvdisplay -v /dev/dsk/c1t1d0 | more on each one.

cstm mstm or xstm might be useful in diagnosing which disk has gone.

SEP

Re: swap space problem

Nguyen Anh Tien — Mon, 13 Dec 2004 23:33:41 GMT

Hi Tuan.
Iam sure that you disk (that contains swap logical volume) has fail.
If you have 2 internal disk and mirrored together. you should shutdown server, unplug faild disk and boot.
You can check your hardware on system by using stm, cstm, xstm (x mode),syslog.
If you do not want to unplug disk, put your server in single mode and check disk,swaplv again by:
pvdisplay -v /dev/dsk/cxtxdx
swapinfo
vi /var/adm/syslog/syslog.log
tienna

Re: swap space problem

Hoang Minh Tuan — Wed, 15 Dec 2004 05:53:53 GMT

Thanks all,

swapinfo display with lvol2 and /vg01/lvswap and as I talk above, I setted swap on lvswap with priority 0 (greater than 1 in lvol2) so I think that it will not use lvol2 as swapspace except lvswap used full.
In /etc/fstab I editted it automatically mount /dev/vg01/lvswap as swap space.

Up to now, I have not changed any parameters of OS and Oracle.
I started to single user mode and checked system but there 's no warning/abnormal signal in syslog.log, rc.log, /tombstones/ts99 and shutdownlog.

I don't have glance tool and it's OK when pvdisplay with the disk including O.S

Hi Tien and happy to meet a Vietnam person. Following your question, disks are not mirrored and I can't unplug the fail disk because it containt HP-UX O.S.

Some days ago, I decided replacing a new one and used ignite tape to recover O.S in new disk. It has worked well till now.
Many thanks for all of your help

Re: swap space problem

Hoang Minh Tuan — Fri, 24 Dec 2004 01:50:16 GMT

Thanks to all