I've seen this before.  The drive shows up absolutely fine through its ethernet 
interface, but nothing through fibre, requires hard or soft reset to recover.  
It's a bug specific to IBM fibre attached LTO drives (I *think* I debugged this 
on LTO II, but could have been LTO).  From what I understand IBM refused to 
admit to this bug (the drive reports no problems, ergo there can't be any 
problems with the drive) but it's fixed in later firmware versions.
 
HTH,
 
Stuart.

________________________________

From: Legato NetWorker discussion on behalf of Raghava Karu
Sent: Sun 20-Aug-06 23:12
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Tape drives going to unavailable state



We are getting too many unload retry messages with IBM LTO II FC drives.  mt -f 
/dev/rmt/*cbn status showing unknown, but the same device repsonding once it's 
power'd off/on. Is this a bug in 7.2 ? or did I miss anything in configuration?

Our env is in LAN free/DDS with 8 storage nodes. OS : Solaris 9

Thanks in advance
Raghava

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