how to increase system dump

[shoux]

Hi expert !

below is the errpt snapshoot.

E87EF1BE 0829150003 P O dumpcheck The largest dump device is too small.

Thank you

shoux

 

[Morsing]

Hi,
run 'sysdumpdev -l' to list your sysdump settings.

Normally you'd use the paging space to dump but it might be too small in you case.
If the above command says 'hd6' and 'lsps -a' shows hd6 to be less than the size of your physical memory you need to either increase your paging space or create a dedicated dump device. I think it is also possible to use compressed dumps but I have no experience with this.

Cheers

Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support

 

[sushveer]

Hi shoux

Check your primary and secondary dump device or paging space
first by using command
#sysdumpdev -l
some cases primary may be /dev/hd6 (paging space) or anything
and secondary will be /dev/sysdumpnull

check the various pagespace and dumpdevices by using
#lsps -a command
Also u can find total paging space and percentage used by using command
#lsps -s

So based on the outputs of above mentioned 3 commands make a decision accordingly and enhance paging space by using command syntax
#chps -s <logical_pps> <paging space>
Then run swapon -a to make paging spaces available for all devices


sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[Tyger01]

To determine the space needed for you dump device
run the command
sysdumpdev -e
then change the size of your primary dump device to
match the size from the output. Or create a new logical
volume of the size desired and configure it as the primary dump device (smitty dump) if you don't want to increase you paging space (default dump) hd6.

 

[shoux]

Hi,

to : mersing,sushveer and tiger01, thanks for your response.anyway below is the info. the percentage used is only 2%. do i need to increase the paging space ?

thanks for your advise



[ShOuX] >lsps -a
Page Space Physical Volume Volume Group Size %Used Active Auto Type
hd6 hdisk0 rootvg 512MB 2 yes yes lv
[ShOuX] >lsps -s
Total Paging Space Percent Used
512MB 2%
[ShOuX] >sysdumpdev -e
0453-041 Estimated dump size in bytes: 902823936



shoux

 

[sushveer]

Hi shoux

Can you post your real memory on the system
pls isssue command
$bootinfo -r (you will get in kbs)

I would like to know whether ram and page space relation is as per thumbrule

sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[dsn1]

I would suggest creating a specific dump logical volume if you don't already have one. You can get an idea on what size is needed using

sysdumpdev -e

Divide this by 1048576 to get the estimated size in MB

Create a logical volume a bit larger than this perhaps setting type to sysdump to make it obvious what it is for

mklv -y sysdump -t sysdump rootvg <number of partitions>

Then make this lv the primary dump device and compress dumps

sysdumpdev -P -p /dev/sysdump
sysdumpdev -C

This will save the system using paging space when it takes a dump and then it trying to copy it to another filesystem when it boots. With it in its own lv, it will just remain there as long as you need it for

Dave

 

[shoux]

hi sushveer,
below is the info,

[ShOuX] >bootinfo -r
8388608


Thanks


shoux