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тАО09-25-2009 07:21 AM
тАО09-25-2009 07:21 AM
Does /var/adm/crash have to be mounted on root vg (vg00)?
I read the documentation, but just wanted to confirm.
Thanks!
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тАО09-25-2009 07:29 AM
тАО09-25-2009 07:29 AM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
Send me your /etc/fstab file and vgdisplay -v vg00
What you are asking you should know. Is crash a mount point or a sub directory of /var? So check for a log vol assicated to crash.
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тАО09-25-2009 07:47 AM
тАО09-25-2009 07:47 AM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
There is no seperate mount point for /var/adm/crash on the system now, so any crash would currently go to /var. /var doesn't have enough space to handle the recommended size for a crash.
There is no more free space in /vg00 (internal disk), and I don't think I can create an LV on another VG and mount /var/adm/crash there and have the system write a crash to that location.
I'm trying to confirm if I'm correct.
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тАО09-25-2009 08:01 AM
тАО09-25-2009 08:01 AM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
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тАО09-26-2009 11:52 AM
тАО09-26-2009 11:52 AM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
Well check for free space on your box. Please post these reports:
vgdisplay -v vg00
ioscan -funC disk
Thanks!
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тАО09-26-2009 02:35 PM
тАО09-26-2009 02:35 PM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
As far as i have worked and know that the default Hp-ux will have /var/adm/crash as a default Mount point in /vg00.
It is recommended to have the /var/adm/crash on /vg00.
what if the /var fills out? Server hangs and somes times goes for toss.
It is always recommended.
Thanks
Ravi
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тАО09-26-2009 03:50 PM
тАО09-26-2009 03:50 PM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
Never keep /var/adm/crash in the same logical volume as /var/. Too easy to make
a mess and fill critical file system like
/var.
In fact, when I design HP-UX servers, three
separate file systems are part of critical
setup:
/var
/var/tmp
/var/adm/crash
... and if OVO is used, I even add
/var/opt/perf
/var/opt/OV
The good practice actually brings different
view on how to set up crash areas,
especially on servers with large amount of RAM:
a) Separate dump from swap (default is they
are together on primary swap);
b) Disable savecrash at boot time and
save around 50% time for a reboot when
crash happens;
c) Create separate logical volume (it can
be in ANY volume group, not necessarily
root VG or DG, depending on if you use
LVM or VxVM);
d) Once you recover from a crash, you
can manually start savecrash process.
That makes your SLA much better and
customer happier!
Just think what happens during crash recovery
on a server with, say 256 GB RAM.
It might take along time to save pages into dump/swap on the way "down", and taking
a lot of time exporting those raw pages into, say, /var/adm/crash" on the way "up".
Waste of time and customer will
certainly not be happy waiting so long
for a server to come on-line.
Cheers,
VK2COT
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тАО09-26-2009 05:01 PM
тАО09-26-2009 05:01 PM
Re: Does /var/adm/crash have to be mounted on root vg (vg00)?
Best Practice to have :
/var/adm/crash as a "separate filesystem " say lvol10 , in vg00 . (16GB space), if you have 16GB primary swap configured.
# To check dump size required, in case of a crash , use:
# /sbin/crashconf -v
-Look for "Total Pages included in the dump" , multiply by 4K , i.e = dump size you need ., including /var/adm/crash space.
- If you need additional dump space, add more dump lv :
You can specify up to 32 different dump devices. These LVs must not contain a filesystem and have to belong to the rootVG (/dev/vg00).
then and add in fstab and activate using crashconf -a .
-Check again using crashconf -v.
A good description of the 11.X dump process can be found in the ├в System Crash Dump White
Paper├в located at /usr/share/doc/sys_crash.txt on every UX 11.X system.
Hth.
Raj.
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тАО09-28-2009 01:54 PM
тАО09-28-2009 01:54 PM