scsi troubles

[Mike Galvez]

On Thu, Apr 20, 2006 at 12:35:59PM -0400, Stas Khromoy wrote:
> 
> i am pretty  sure backups don't work when error comes up
>  and the tape drive locks up at that time too, requiring a cold reset
> 
> is any one else using this tape model (powervault 114t LTO2 tape drive)?

Stas,

I am using a PV-124T LTO2. I am having similar issues with the changer
locking up when moving tapes. I didn't see the earlier part of this thread,
so I don't know what you are using for backup software.

I'm using Amanda 2.4.5p1 with FreeBSD 6.1-RC1 on Dell PE-850 and having a few 
issues getting it to run smoothly. I was beginning to wonder if I got a bad
changer. 

I am able to make backups and restore from them, but every so often I get a 
"Dump Card State" message and the changer locks up and has to be power-cycled.

ch0 at ahc0 bus 0 target 6 lun 1
ch0: <DELL PV-124T 0026> Removable Changer SCSI-2 device 
ch0: 160.000MB/s transfers (80.000MHz, offset 127, 16bit)
ch0: 8 slots, 1 drive, 1 picker, 0 portals
(sa0:ahc0:0:6:0): tape is now frozen- use an OFFLINE, REWIND or MTEOM command
to clear this state.
(sa0:ahc0:0:6:0): tape is now frozen- use an OFFLINE, REWIND or MTEOM command
to clear this state.
ahc0: Recovery Initiated
>>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
ahc0: Dumping Card State while idle, at SEQADDR 0x8
Card was paused
ACCUM = 0x4, SINDEX = 0x67, DINDEX = 0x27, ARG_2 = 0x4
HCNT = 0x0 SCBPTR = 0x0
SCSIPHASE[0x0] SCSISIGI[0x0] ERROR[0x0] SCSIBUSL[0x0] 
LASTPHASE[0x1]:(P_BUSFREE) SCSISEQ[0x12]:(ENAUTOATNP|ENRSELI) 
SBLKCTL[0xa]:(SELWIDE|SELBUSB) SCSIRATE[0x0] SEQCTL[0x10]:(FASTMODE) 
SEQ_FLAGS[0xc0]:(NO_CDB_SENT|NOT_IDENTIFIED) SSTAT0[0x0] 
----- snip ----

This probably isn't helpful as I don't have an answer for why this happening.
I'm still looking.

	-Mike
> 
> 
> -----
> >
> >[snip]
> >
> >Do you know for sure if the backups are failing?  It's possible the dump
> >card states are harmless.  I have some systems that do a dump card state
> >on boot but that have never exhibited an actual problem.
> >
> >Another suggestion is to check if you have the latest firmware for both
> >the tape drive and the controller.
> >
> >Still more people will probably say that there is bad voodoo between
> >whoever your controller vendor is and whoever your drive vendor is.
> >
> >Mike
> >
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-- 
Michael Galvez             http://www.people.virginia.edu/~mrg8n
Information Technology Specialist         University of Virginia
USENIX Member