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List:       adsm-l
Subject:    Re: Linux & SAN Device Interruptions
From:       Remco Post <r.post () PLCS ! NL>
Date:       2011-04-19 12:09:59
Message-ID: 117F9940-9A65-4D13-97FD-7D9BA25D02F9 () plcs ! nl
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Hi Nick,

linux has to possibility of hot-adding scsi (fc, sas) devices by talking to \
/proc/scsi/scsi, modern kernels do that better than older ones, where you have to add \
each individual device manually. You might want to google for 'linux scsi hot-add' or \
'linux scsi rescan', or just read this page, near the bottom: \
http://www.garloff.de/kurt/linux/


On 30 mrt 2011, at 01:23, Nick Laflamme wrote:

> How are those of you who run TSM servers or storage agents on Linux on Intel doing \
> with disruptions with SAN-attached tape devices or the SAN fabric itself? 
> In my current shop, we run TSM servers on AIX (and MVS, but that's another story), \
> but we have storage agents on AIX, Windows, and Red Hat Linux on Intel. The Linux \
> storage agents are relatively new; they were first deployed about two years ago. \
> AIX and Windows storage agents have been there a bit longer, although I can't say \
> how much longer; I, too, have been there less than two years.  
> One problem that we've never been able to overcome with our Linux storage agents \
> has been that if a virtual tape library is rebooted or if the SAN fabric gets \
> massively unzoned (it happened about a month ago to us, sigh), the Linux storage \
> agents don't notice the return of the SAN-attached tape devices until we reboot the \
> Linux server. (We never had the Linux servers zoned to real 3584s and real LTO tape \
> devices; they've only ever been zoned up to EMC Clariian Disk Libraries and then \
> DataDomains with VTL cards in them.) This has persisted across updates to LINtape, \
> CDL code levels, Data Domain code levels, and TSM storage agent levels. Needless to \
> say, the application teams are rather steamed with us about this.  
> We have at times had cases open simultaneously with EMC, Red Hat, and IBM, to no \
> avail.  
> If you have Linux TSM servers or storage agents that gracefully recover from \
> disruptions on your tape SAN, can you share with me (and the rest of the list, if \
> you want) RHEL level, device driver levels, HBA configuration, and whatever else \
> you think might be relevant?  
> Thanks,
> Nick

-- 
Met vriendelijke groeten/Kind Regards,

Remco Post
r.post@plcs.nl
+31 6 248 21 622


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