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Date:      Tue, 09 Aug 2011 12:27:04 +0200
From:      Alessandro Spinella <a.spinella@rfc1925.net>
To:        freebsd-questions@freebsd.org
Subject:   FreeBSD 8.1 and HP SureStore 24x6 problem
Message-ID:  <4E410B78.6040007@rfc1925.net>

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goodmorning,

am a newbye of "tape units" and am experiencing a related problem

in short : having

weed# uname -a
FreeBSD weed.rfc1925.net 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 
02:55:53 UTC 2010 
root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

the HP device seem to be recognized

weed# dmesg
.......[snip out some unrelated lines ]
ahc0: <Adaptec 2902/04/10/15/20C/30C SCSI adapter> port 0xd000-0xd0ff 
ahc0: Host Adapter Bios disabled.  Using default SCSI device parameters
ahc0: [ITHREAD]
aic7850: Single Channel A, SCSI Id=7, 3/253 SCBs
.......[snip out some unrelated lines ]
(probe5:ahc0:0:5:0): TEST UNIT READY. CDB: 0 0 0 0 0 0
(probe5:ahc0:0:5:0): CAM status: SCSI Status Error
(probe5:ahc0:0:5:0): SCSI status: Check Condition
(probe5:ahc0:0:5:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, 
reset, or bus device reset occurred)
(probe5:ahc0:0:5:0): TEST UNIT READY. CDB: 0 0 0 0 0 0
(probe5:ahc0:0:5:0): CAM status: SCSI Status Error
(probe5:ahc0:0:5:0): SCSI status: Check Condition
(probe5:ahc0:0:5:0): SCSI sense: NOT READY asc:3a,0 (Medium not present)

NOTE : Medium *is* present, have loaded upto 6 tapes on charger !

sa0 at ahc0 bus 0 scbus0 target 5 lun 0
sa0: <HP C1557A U709> Removable Sequential Access SCSI-2 device
sa0: 10.000MB/s transfers (10.000MHz, offset 15)

ch0 at ahc0 bus 0 scbus0 target 5 lun 1
ch0: <HP C1557A U709> Removable Changer SCSI-2 device
ch0: 10.000MB/s transfers (10.000MHz, offset 15)
ch0: 6 slots, 1 drive, 0 pickers, 0 portals

as reported by

weed# camcontrol devlist
<HP C1557A U709>                   at scbus0 target 5 lun 0 (sa0,pass0)
<HP C1557A U709>                   at scbus0 target 5 lun 1 (ch0,pass1)

and

weed# ls -l /dev/
......
crw-------  1 root  operator    0, 125 Aug  9 08:25 ch0
......
lrwxr-xr-x  1 root  wheel            6 Aug  9 08:25 esa0 -> esa0.0
crw-rw----  1 root  operator    0, 112 Aug  9 08:25 esa0.0
crw-rw----  1 root  operator    0, 118 Aug  9 08:25 esa0.1
crw-rw----  1 root  operator    0, 121 Aug  9 08:25 esa0.2
crw-rw----  1 root  operator    0, 124 Aug  9 08:25 esa0.3
........
lrwxr-xr-x  1 root  wheel            6 Aug  9 08:25 nsa0 -> nsa0.0
crw-rw----  1 root  operator    0, 111 Aug  9 08:25 nsa0.0
crw-rw----  1 root  operator    0, 117 Aug  9 08:25 nsa0.1
crw-rw----  1 root  operator    0, 120 Aug  9 08:25 nsa0.2
crw-rw----  1 root  operator    0, 123 Aug  9 08:25 nsa0.3
.......
lrwxr-xr-x  1 root  wheel            5 Aug  9 08:25 sa0 -> sa0.0
crw-rw----  1 root  operator    0, 110 Aug  9 08:25 sa0.0
crw-rw----  1 root  operator    0, 116 Aug  9 08:25 sa0.1
crw-rw----  1 root  operator    0, 119 Aug  9 08:25 sa0.2
crw-rw----  1 root  operator    0, 122 Aug  9 08:25 sa0.3
crw-rw----  1 root  operator    0, 109 Aug  9 08:25 sa0.ctl
.........


but as soon as i try to initialize one or more tapes just can get

weed# mt -f /dev/sa0 status
mt: /dev/sa0: Device not configured

(also tried nsa0, ch0, esa0)

as long as i can guess the matter is neither of OS, SCSI adapter and 
driver, just the tape that is not "seen" in place.

googling had took time but no pertinent data has been found, so am 
asking you

1) where to get more info about that error? man is great but am unable 
to find a command that can help in debug my fault.

2) if, as supposed, almost all is "nice" and am just misunderstood 
something : how to get a working /dev/sa0 where to dump data?


thanks for your time


Alessandro




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