hpux 11.31 Disk recovery

[san.sa]

We are facing some strange behavior on hpux 11.31 nodes. The LUNs are getting discovered by the system automatically . ie without an ioscan and insf commands.

It creates problems when we tried to do storage reclaims . We remove the device once , however after sometime the disk are getting discovered again . I verified the history to make sure no one ran ioscan commands .

Storage attached are HP XP and EVA ones

How can I disable this ?

[melvyn burnard · Accepted solution]

That is because HP-UX 11.31 does this automatically rfor you.
If you need to disable this, then you need to set a kernel tuneable parameter to change what is called "strobe and detect" from it's normal setting (default is 80) to 100 (effectively turns it off.
use the folloiwng to verify what it is currenlty:
kctune intr_strobe_ics_pct
to disable it do:
kctune intr_strobe_ics_pct=100
and verify it again.

[san.sa]

The Parameter set as
root: $ kctune intr_strobe_ics_pct
Tunable Value Expression Changes
intr_strobe_ics_pct 80 Default Immed

I will change it and check it .. Thanks for the details