[stgt] VTL tape not working

Albert Pauw albert.pauw at gmail.com
Tue Feb 17 07:01:24 CET 2009

Hi Tomo,

see if you can reproduce this.
> Can you tell me the exact procedure to reproduce this?
> Thanks,
OS: Fedora 9, fully updated
open-iscsi: latest git version
tgt: latest git version
all running on same hardware

This is the entry in /etc/tgt/targets.conf:

target iqn.2008-09.com.example:server.tape>
    backing-store /home/tapes/A3678299
#    incominguser someuser secretpass12
#    outgoinguser userA secretpassA
#    write-cache off
    device-type tape
    lun 1
    MaxRecvDataSegmentLength 8192
    MaxXmitDataSegmentLength 8192
    HeaderDigest CRC32C
    DataDigest None
    InitialR2T Yes
    MaxOutstandingR2T 1
    ImmediateData Yes
    FirstBurstLength 65536
    MaxBurstLength 262144
    DataPDUInOrder Yes
    DataSequenceInOrder Yes
    ErrorRecoveryLevel 0
    IFMarker No
    OFMarker No
    DefaultTime2Wait 2
    DefaultTime2Retain 20
    OFMarkInt Reject
    IFMarkInt Reject
    MaxConnections 1

I log into the target with open-iscsi. Indeed a /dev/st0 and /dev/nst0 device are created.

mt -f /dev/st0 status

works fine.

The tape file A3678299 is created with tgtimg and is a 100 MB data tape.

A simple

tar cvzf /dev/st0 /etc/tgt

works fine, no errors. However reading it back creates read error (I believe no EOF or something like that).

But a bigger tar

tar cvzf /dev/st0 /home/apauw

bombs out with a segfault, one tgtd daemon dies (there should be two running).
The actual file is just 10k big.

That's what I do, rather simple.

Now I may be doing something wrong here, but see if you can replicate this.



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