topic Re: Fc disk on Ioscan in Operating System - HP-UX

Fc disk on Ioscan

Ranjith M — Fri, 11 Jul 2008 03:52:59 GMT

Hi All,

How is fc disk notation on ioscan.

sdisk denotes scsi disk or its same for fc disk also.

One more querry on claimed state - does that mean the drivers for that hardware is fine and OS able to see the device properly

Best Regards,

RM

Re: Fc disk on Ioscan

Torsten. — Fri, 11 Jul 2008 04:12:01 GMT

Here is an example:

disk 5 0/4/0/0/0/0.12.0.0.0.0.1 sdisk CLAIMED DEVICE HP HSV210
/dev/dsk/c1t0d1 /dev/rdsk/c1t0d1

This is a LUN 1 presented from an EVA.

As you can see, it's the sdisk driver too.

Re: Fc disk on Ioscan

Ranjith M — Fri, 11 Jul 2008 04:23:28 GMT

So sdisk means scsi disk ? if yes what would be the notation for fc disk

Re: Fc disk on Ioscan

Rajeev Shukla — Fri, 11 Jul 2008 04:36:34 GMT

fc disks also will be represented by OS as scsi disk because in the bottom layer the the FC is transport but uses SCSI protocol.
FC disks means SCSI over Fibre channel

Re: Fc disk on Ioscan

Torsten. — Fri, 11 Jul 2008 05:15:22 GMT

sdisk is the SCSI disk driver, but also used for FC disks. The protocol details are a bit complicated, but the fc communication used here is in general encapsulated SCSI.

So briefly speaking, from the system point of view there is no difference between a real SCSI and a FC disk - they are all just disks. (I know, this explanation is very much simplified).

Re: Fc disk on Ioscan

Jeeshan — Fri, 11 Jul 2008 05:30:06 GMT

>>sdisk denotes scsi disk or its same for fc disk also.

I think you have got your answer from above. moreover don't confused about fc disk and scsi disk. connectivity is fc but OS uses these disks as a scsi.

>>does that mean the drivers for that hardware is fine and OS able to see the device properly

CLAIMED state means the OS can recognize it.

Re: Fc disk on Ioscan

Ranjith M — Fri, 11 Jul 2008 05:56:10 GMT

fc driver same for scsi, claimed state shows OS recognise the device