ioscan NO_HW error message.!!

[rveri]

Hi ,

I am getting this error message in ioscan ,(NO_HW)
Can any one explain what does it mean actually . earlier this NO_HW message was not there,


disk 74 1/10/0/0.98.13.19.3.15.2 sdisk CLAIMED DEVICE EMC SYMMETRIX
disk 75 1/10/0/0.98.13.19.3.15.3 sdisk CLAIMED DEVICE EMC SYMMETRIX
disk 76 0/12/0/0.97.4.19.0.1.1 sdisk NO_HW DEVICE EMC SYMMETRIX
disk 77 0/12/0/0.97.4.19.0.1.2 sdisk NO_HW DEVICE EMC SYMMETRIX
disk 78 1/10/0/0.98.13.19.0.1.0 sdisk NO_HW DEVICE EMC SYMMETRIX
disk 79 1/10/0/0.98.13.19.0.1.1 sdisk NO_HW DEVICE EMC SYMMETRIX
disk 80 0/12/0/0.97.4.19.0.1.3 sdisk NO_HW DEVICE EMC SYMMETRIX
disk 81 1/10/0/0.98.13.19.0.1.2 sdisk NO_HW DEVICE EMC SYMMETRIX
$

Thanks,

Veri.
---------

[Patrick Wallek]

Basically it means that the machine you are running that command from no longer has access to those particular LUNs on the EMC array.

This could be due to any number of things: 1) Bad cable 2) Bad Fibre card 3) Bad SAN Switch port 4) The zoning for those LUNs was changed and you no longer have access.

[Hoang Chi Cong_1]

Hi rveri.

You didn't say the system's status now.
You may used ioscan -fnuC disk command!
With "u" option, this command don't scan hardware, just read the result from the last ioscan -fnC disk command before.

Is your system OK now?
If yes, let's try with : ioscan -fC disk command.
Show me the result.

Goodluck!
Regard,
HoangChiCong

[Isralyn Manalac_1]

HI Veri,

NO_HW means that the system no longer has access to that specific device.

Regards,

Isralyn

[Steven E. Protter]

You had a disk and now you don't.

As I recall this does not usually happen when you move around or remove LUNS unless you do it while the system is hot.

The diagnostics given above are good. You might notice some data missing.

SEP

[Noel Miranda]

That particular field is the software field, which give you the software binding state.

NO_HW implies that the hardware at this address is no longer responding.

Try forcibly binding driver sdisk at the concerned hardware paths.
ioscan -M sdisk -H

[Gerhard Roets]

Hi Veri

IF there is a device on that port sending "succesfull" hardware info and bound to a driver it would say CLAIMED.
If the driver is not working correctly or not installed it would be "UNCLAIMED/UNKNOWN".

Now if it was CLAIMED to some time prior to the point where the sucessfull interigation messages stopped going through the status will change to "NO_HW" this thus implies that the hardware the machine is "expecting" there is not there any more.

I do notice this is on different IO paths and different switch zones. I would expect that either the SYMMETRIX went down or the switches ... or a business copy is taking place involving those luns.

Hope this helps in some way
Gerhard

[Matthew Ghofrani]

Few things;
Are those disks part of any volume group?
If so, do they appear in "string s/etc/lvmtab"?
If so, can you activate the vg "vgchange -a y /dev/vg??"?

If your problem s software rather than hardware a reboot would be in order, or simply do following 3 steps:
1. rm or rmsf on all /dev/dsk/.. & /dev/rdsk/..
2. ioscan -fnC disk
3. insf -e

Good luck from Matthew in Boston