Fibre Bridge Gives "Failed TUR" Message

An ADIC SNC 5100 fibre bridge attached to a desktop LVD tape drive is giving
a message that the tape drive "Failed TUR".

What does TUR stand for? It is apparently a widely used acronym in fibre
channel devices. What would be the likely reason for the device to enter
into this status?

--
Will

Will wrote:
>
> An ADIC SNC 5100 fibre bridge attached to a desktop LVD tape drive is giving
> a message that the tape drive "Failed TUR".
>
> What does TUR stand for? It is apparently a widely used acronym in fibre
> channel devices.

TUR stands for the SCSI command TEST UNIT READY. This command is
mandatory for all SCSI devices and is not FC specific.

> What would be the likely reason for the device to enter
> into this status?

The drive can tell you the reason. If the TUR command fails, it returns
CHECK CONDITION status. Now the host can send a REQUEST SENSE command to
receive information about the error (sense data).

For Linux you can use 'sg_turs' from the sgutils package to do this. For
a tape drive without medium this looks like this:
----------------------------------------------------------------------
[root@WStation2:~]# sg_turs /dev/sg5
test unit ready: SCSI status: Check Condition
Fixed format, current; Sense key: Not Ready
Additional sense: Medium not present

Raw sense data (in hex):
70 00 02 00 00 00 00 0e 00 00 00 00 3a 00 00 00 00 00 00 00 00 00
plus...: Driver_status=0x08 [DRIVER_SENSE, SUGGEST_OK]
Completed 1 Test Unit Ready commands with 1 errors
----------------------------------------------------------------------


[Xpost reduced to cps]

Micha

TUR = Test Unit Ready

A SCSI command whose only purpose is to be completed successfully or failed
in some way, it does nothing else.

TUR is failed if, say, there is no media in the drive or if the drive motor
is not spinned up. This is a usual way to check for media being present in the
drive.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"Will" <westes-usc@noemail.nospam> wrote in message
news:IZGdnbUUh9K6J-DanZ2dnUVZ_gydnZ2d@giganews.com...
> An ADIC SNC 5100 fibre bridge attached to a desktop LVD tape drive is giving
> a message that the tape drive "Failed TUR".
>
> What does TUR stand for? It is apparently a widely used acronym in fibre
> channel devices. What would be the likely reason for the device to enter
> into this status?
>
> --
> Will
>
>