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тАО06-09-2013 10:46 PM - edited тАО06-09-2013 10:55 PM
тАО06-09-2013 10:46 PM - edited тАО06-09-2013 10:55 PM
configuring dump device and other questions
The dump device we have in our servers is /dev/vg00/lvol2
crashconv -v/crashconf-l confirms it
Just wanted to check...is this not a recommendedconfiguration? setting lvol2 as dump device? if yes why? (question 1)
I understand lvol2 will be dumpdevice by default
I have these: 11.31 OS / vxfs / LVM
RAM 16GB, soon we will increase it to 32GB
if due to some reason...in my environment here, if i were asked to unconfigure swap (lvol2) as dump and set something else as dumpdevice..then i need to use space left in VG00..which is just 4GB
I dont want to use that left over space in vg00.
can i use /var/adm/crash as my dumpdevice instead of lvol2? (question 2)
/dev/vg00/lvol9 16777216 70376 15662798 0% /var/adm/crash
If yes, how do I do that? (question 3)
Another question is
crashconf -v output has this
Total pages included in dump: 606354
so this is how I calculated space needed for dump
Dumpsize = 606354x4KB=2425416KB = 2.3GB
2.3 x 1.2 = 2.77 GB
So..am I right in saying that 2.77 GB is what we need for a dump to happen completely? (question 4)
can you please suggest and help
thank you.
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тАО06-09-2013 10:58 PM
тАО06-09-2013 10:58 PM
Re: configuring dump device and other questions
o/p
# crashconf -v
Crash dump configuration has been changed since boot.
CLASS PAGES INCLUDED IN DUMP DESCRIPTION
-------- ---------- ---------------- -------------------------------------
UNUSED 3038384 no, by default unused pages
USERPG 412167 no, by default user process pages
BCACHE 60671 no, by default buffer cache pages
KCODE 9081 no, by default kernel code pages
USTACK 3091 yes, by default user process stacks
FSDATA 12 yes, by default file system metadata
KDDATA 594434 yes, by default kernel dynamic data
KSDATA 8817 yes, by default kernel static data
SUPERPG 66227 no, by default unused kernel super pages
Total pages on system: 4192884
Total pages included in dump: 606354
Dump compressed: ON
Dump Parallel: ON
DEVICE OFFSET(kB) SIZE (kB) LOGICAL VOL. NAME
------------ ------------ ------------ ------------ -------------------------
1:0x000000 2087776 16777216 64:0x000002 /dev/vg00/lvol2
------------
16777216
Dump device configuration mode is config_deprecated_mode.
Use crashconf -s option to change the mode.
#
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тАО06-09-2013 11:50 PM
тАО06-09-2013 11:50 PM
Re: configuring dump device and other questions
>unable to attach
You may need to give it a .txt suffix.
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тАО06-10-2013 02:08 AM
тАО06-10-2013 02:08 AM
Re: configuring dump device and other questions
thank you Dennis.... attaching now
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тАО06-11-2013 08:18 AM
тАО06-11-2013 08:18 AM
Re: configuring dump device and other questions
Check with
# lvlnboot -v
...
Dump: lvol2 on: /dev/dsk/c2t0d0s2, 0
...
In case of a crash the memory will be dumped to this device, then compressed and stored in the crashconf directory.
In some cases you need to think about if you can life without a complete dump (imagine a SD2 with 4TB RAM!).
However, you may consider to increase the dump device by using ignite backup/restore.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО06-11-2013 10:33 AM
тАО06-11-2013 10:33 AM
Re: configuring dump device and other questions
yes...dev/vg00/lvol2 is default in our server too.
crashconf -v / crashconf -l / lvlnboot command outputs confirm it,
our design documents says - primary swap MUST NOT be used to receive crash dumps.
So I am looking for other places..
unfortunately, our VG00 is left with just 3.5Gb of free space.
RAM = 16GB
pri swap lvol2=16GB
additional (sec) swap = /dev/vgxx/lvolyy = 16GB
11.31 hpux
the image we used to deploy OS from ignite has /var/adm/crash too in it.
it will created automatically and its entries will be present in fstab by default.
I learnt that ..in this case /var/adm/crash(/dev/vg00/lvol9) isnt a raw device , so it cant be used to receive system crash dump.
so how do I go about this?
can I not use /var/adm/crash as dump device?
or my other idea is
reduce /var/adm/crash size from 16Gb to 8GB..thus freeing up some space from VG00 and used this freedup space in g00 to create an LV and use to receive dumps.
any suggestions please?
thank you
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тАО06-11-2013 11:11 AM
тАО06-11-2013 11:11 AM
Re: configuring dump device and other questions
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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No support by private messages. Please ask the forum!
If you feel this was helpful please click the KUDOS! thumb below!
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тАО06-12-2013 10:21 AM
тАО06-12-2013 10:21 AM
Re: configuring dump device and other questions
thanks...so I cannot make /var/adm/crash to appear in crashconf -v output
so... will free up some space in VG00
create a new lvol in VG00
and will then configure this new lvol as dumpdevice