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Date:      Sun, 1 Mar 2015 19:06:08 -0700
From:      "Kenneth D. Merry" <ken@FreeBSD.ORG>
To:        Dan Langille <dan@langille.org>
Cc:        current@freebsd.org, scsi@freebsd.org
Subject:   Re: sa(4) driver changes available for test
Message-ID:  <20150302020608.GA73433@mithlond.kdm.org>
In-Reply-To: <DF7D6419-C120-4162-8391-ACB9DD921A50@langille.org>
References:  <20150214003232.GA63990@mithlond.kdm.org> <4A478C5C-7965-498E-9F0F-80192265E310@langille.org> <20150302001833.GA71528@mithlond.kdm.org> <6C82281F-649A-4DA8-8ACF-17E81C04F730@langille.org> <20150302003658.GA72258@mithlond.kdm.org> <DF7D6419-C120-4162-8391-ACB9DD921A50@langille.org>

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On Sun, Mar 01, 2015 at 19:40:40 -0500, Dan Langille wrote:
> 
> > On Mar 1, 2015, at 7:36 PM, Kenneth D. Merry <ken@FreeBSD.ORG> wrote:
> > 
> > On Sun, Mar 01, 2015 at 19:28:37 -0500, Dan Langille wrote:
> >> 
> >>> On Mar 1, 2015, at 7:18 PM, Kenneth D. Merry <ken@FreeBSD.ORG> wrote:
> >>> 
> >>> On Sun, Mar 01, 2015 at 17:06:24 -0500, Dan Langille wrote:
> >>>> 
> >>>>> On Feb 13, 2015, at 7:32 PM, Kenneth D. Merry <ken@freebsd.org> wrote:
> >>>>> 
> >>>>> 
> >>>>> I have a fairly large set of changes to the sa(4) driver and mt(1) driver
> >>>>> that I'm planning to commit in the near future.
> >>>>> 
> >>>>> A description of the changes is here and below in this message.
> >>>>> 
> >>>>> If you have tape hardware and the inclination, I'd appreciate testing and
> >>>>> feedback.
> >>>>> 
> >>>>> ============
> >>>>> Rough draft commit message:
> >>>>> 
> >>>>> http://people.freebsd.org/~ken/sa_changes_commitmsg.20150213.3.txt
> >>>>> 
> >>>>> The patches against FreeBSD/head as of SVN revision 278706:
> >>>>> 
> >>>>> http://people.freebsd.org/~ken/sa_changes.20150213.3.txt
> >>>>> 
> >>>>> And (untested) patches against FreeBSD stable/10 as of SVN revision 278721.
> >>>>> 
> >>>>> http://people.freebsd.org/~ken/sa_changes.stable_10.20150213.3.txt
> >>>>> ============
> >>>>> 
> >>>>> The intent is to get the tape infrastructure more up to date, so we can
> >>>>> support LTFS and more modern tape drives:
> >>>>> 
> >>>>> http://www.ibm.com/systems/storage/tape/ltfs/
> >>>>> 
> >>>>> I have ported IBM's LTFS Single Drive Edition to FreeBSD.  The port depends
> >>>>> on the patches linked above.  It isn't fully cleaned up and ready for
> >>>>> redistribution.  If you're interested, though, let me know and I'll tell
> >>>>> you when it is ready to go out.  You need an IBM LTO-5, LTO-6, TS1140 or
> >>>>> TS1150 tape drive.  HP drives aren't supported by IBM's LTFS, and older
> >>>>> drives don't have the necessary features to support LTFS.
> >>>>> 
> >>>>> The commit message below outlines most of the changes.
> >>>>> 
> >>>>> A few comments:
> >>>>> 
> >>>>> 1. I'm planning to commit the XPT_DEV_ADVINFO changes separately.
> >>>>> 
> >>>>> 2. The XML output is similar to what GEOM and CTL do.  It would be nice to
> >>>>> figure out how to put a standard schema on it so that standard tools
> >>>>> could read it.  I don't know how feasible that is, since I haven't
> >>>>> time to dig into it.  If anyone has suggestions on whether that is
> >>>>> feasible or advisable, I'd appreciate feedback.
> >>>>> 
> >>>>> 3. I have tested with a reasonable amount of tape hardware (see below for a
> >>>>> list), but more testing and feedback would be good.
> >>>>> 
> >>>>> 4. Standard 'mt status' output looks like this:
> >>>>> 
> >>>>> # mt -f /dev/nsa3 status  -v
> >>>>> Drive: sa3: <IBM ULTRIUM-HH6 E4J1> Serial Number: 101500520A
> >>>>> ---------------------------------
> >>>>> Mode      Density              Blocksize      bpi      Compression
> >>>>> Current:  0x5a:LTO-6           variable       384607   enabled (0xff)
> >>>>> ---------------------------------
> >>>>> Current Driver State: at rest.
> >>>>> ---------------------------------
> >>>>> Partition:   0      Calc File Number:   0     Calc Record Number: 0
> >>>>> Residual:    0  Reported File Number:   0 Reported Record Number: 0
> >>>>> Flags: BOP
> >>>>> 
> >>>>> 5. 'mt status -v' looks like this:
> >>>>> 
> >>>>> # mt -f /dev/nsa3 status  -v
> >>>>> Drive: sa3: <IBM ULTRIUM-HH6 E4J1> Serial Number: 101500520A
> >>>>> ---------------------------------
> >>>>> Mode      Density              Blocksize      bpi      Compression
> >>>>> Current:  0x5a:LTO-6           variable       384607   enabled (0xff)
> >>>>> ---------------------------------
> >>>>> Current Driver State: at rest.
> >>>>> ---------------------------------
> >>>>> Partition:   0      Calc File Number:   0     Calc Record Number: 0
> >>>>> Residual:    0  Reported File Number:   0 Reported Record Number: 0
> >>>>> Flags: BOP
> >>>>> ---------------------------------
> >>>>> Tape I/O parameters:
> >>>>> Maximum I/O size allowed by driver and controller (maxio): 1081344 bytes
> >>>>> Maximum I/O size reported by controller (cpi_maxio): 5197824 bytes
> >>>>> Maximum block size supported by tape drive and media (max_blk): 8388608 bytes
> >>>>> Minimum block size supported by tape drive and media (min_blk): 1 bytes
> >>>>> Block granularity supported by tape drive and media (blk_gran): 0 bytes
> >>>>> Maximum possible I/O size (max_effective_iosize): 1081344 bytes
> >>>> 
> >>>> 
> >>>> # mtx -f /dev/pass0 status
> >>>> Storage Changer /dev/pass0:2 Drives, 10 Slots ( 0 Import/Export )
> >>>> Data Transfer Element 0:Empty
> >>>> Data Transfer Element 1:Empty
> >>>>     Storage Element 1:Empty
> >>>>     Storage Element 2:Empty
> >>>>     Storage Element 3:Empty
> >>>>     Storage Element 4:Full :VolumeTag=FAI260                          
> >>>>     Storage Element 5:Full :VolumeTag=FAI261                          
> >>>>     Storage Element 6:Full :VolumeTag=FAI262                          
> >>>>     Storage Element 7:Full :VolumeTag=FAI263                          
> >>>>     Storage Element 8:Empty
> >>>>     Storage Element 9:Empty
> >>>>     Storage Element 10:Empty
> >>>> 
> >>>> 
> >>>> It was at this point I spent the next 90 minute trying to get the tape 
> >>>> drive out of the tape library to free a stuck tape.  Some of this was spent
> >>>> attempting, and failing, to undo a stripped screw.  I stopped the attempt when
> >>>> I noticed the screw did need to be removed.  :/
> >>> 
> >>> Thanks for all of the effort!  Looks like it is paying off! :)
> >>> 
> >>>> When I do this command, I hear the drive move a bit, to read the tape:
> >>>> 
> >>>> # mt -f /dev/nsa1 status
> >>>> Drive: sa1: <DEC TZ89     (C) DEC 2561> Serial Number: CXA09S1340
> >>>> ---------------------------------
> >>>> Mode      Density                Blocksize      bpi      Compression
> >>>> Current:  0x1b:DLTapeIV(35GB)    variable       85937    enabled (IDRC)
> >>>> ---------------------------------
> >>>> Current Driver State: at rest.
> >>>> ---------------------------------
> >>>> Partition:   0      Calc File Number:   0     Calc Record Number: 0
> >>>> Residual:    0  Reported File Number:  -1 Reported Record Number: -1
> >>>> Flags: None
> >>> 
> >>> Looks like the drive isn't reporting position information.  It will still
> >>> be useful to try it with Bacula, though.
> >>> 
> >>>> # mt -f /dev/nsa1 ostatus  
> >>>> Mode      Density              Blocksize      bpi      Compression
> >>>> Current:  0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> ---------available modes---------
> >>>> 0:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> 1:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> 2:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> 3:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> ---------------------------------
> >>>> Current Driver State: at rest.
> >>>> ---------------------------------
> >>>> File Number: 0	Record Number: 0	Residual Count 0
> >>>> 
> >>>> 
> >>>> After doing a very small tar -c and tar -x, I have:
> >>>> 
> >>>> # mt -f /dev/nsa1 /dev/nsa1 ostatus
> >>>> Mode      Density              Blocksize      bpi      Compression
> >>>> Current:  0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> ---------available modes---------
> >>>> 0:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> 1:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> 2:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> 3:        0x1b:DLTapeIV(35GB)    variable       85937    IDRC
> >>>> ---------------------------------
> >>>> Current Driver State: at rest.
> >>>> ---------------------------------
> >>>> File Number: 0	Record Number: 7	Residual Count 0
> >>> 
> >>> Woohoo!  It works.
> >>> 
> >>>> # mt -f /dev/nsa1 status -v
> >>>> Drive: sa1: <DEC TZ89     (C) DEC 2561> Serial Number: CXA09S1340
> >>>> ---------------------------------
> >>>> Mode      Density                Blocksize      bpi      Compression
> >>>> Current:  0x1b:DLTapeIV(35GB)    variable       85937    enabled (IDRC)
> >>>> ---------------------------------
> >>>> Current Driver State: at rest.
> >>>> ---------------------------------
> >>>> Partition:   0      Calc File Number:   0     Calc Record Number: 7
> >>>> Residual:    0  Reported File Number:  -1 Reported Record Number: -1
> >>>> Flags: None
> >>>> ---------------------------------
> >>>> Tape I/O parameters:
> >>>> Maximum I/O size allowed by driver and controller (maxio): 65536 bytes
> >>>> Maximum I/O size reported by controller (cpi_maxio): 0 bytes
> >>>> Maximum block size supported by tape drive and media (max_blk): 16777214 bytes
> >>>> Minimum block size supported by tape drive and media (min_blk): 2 bytes
> >>>> Block granularity supported by tape drive and media (blk_gran): 0 bytes
> >>>> Maximum possible I/O size (max_effective_iosize): 65536 bytes
> >>>> 
> >>>> I may not get to testing Bacula today.  
> >>>> 
> >>>> Based on the above, is there any commands you'd like me to try?
> >>> 
> >>> Aside from making sure things work okay with Bacula, that is probably
> >>> sufficient.  These drives won't support density reports or position
> >>> information.
> >>> 
> >>>> Read below regarding two tape drives
> >>>> 
> >>>>> 
> >>>>> 6. Existing applications should work without changes.  If not, please let
> >>>>> me know.  Hopefully they will move over time to the new interfaces.
> >>>>> 
> >>>>> 7. There are lots of additional features that could be added later.
> >>>>> Append-only support, encryption, more log pages, etc.
> >>>>> 
> >>>>> 8. I have SCSI READ ATTRIBUTE changes for camcontrol(8) that will go in
> >>>>> separately.  These changes allow displaying the contents of the MAM
> >>>>> (Medium Auxiliary Memory) chips on LTO, TS and other modern tape drives.
> >>>>> These are good, and a future possible direction is adding attributes 
> >>>>> to the status XML from the sa(4) driver.
> >>>>> 
> >>>>> ============
> >>>>> Significant upgrades to sa(4) and mt(1).
> >>>>> 
> >>>>> The primary focus of these changes is to modernize FreeBSD's
> >>>>> tape infrastructure so that we can take advantage of some of the
> >>>>> features of modern tape drives and allow support for LTFS.
> >>>>> 
> >>>>> Significant changes and new features include:
> >>>>> 
> >>>>> o sa(4) driver status and parameter information is now exported via an
> >>>>> XML structure.  This will allow for changes and improvements later
> >>>>> on that will not break userland applications.  The old MTIOCGET
> >>>>> status ioctl remains, so applications using the existing interface
> >>>>> will not break.
> >>>>> 
> >>>>> o 'mt status' now reports drive-reported tape position information
> >>>>> as well as the previously available calculated tape position
> >>>>> information.  These numbers will be different at times, because
> >>>>> the drive-reported block numbers are relative to BOP (Beginning
> >>>>> of Partition), but the block numbers calculated previously via
> >>>>> sa(4) (and still provided) are relative to the last filemark.
> >>>>> Both numbers are now provided.  'mt status' now also shows the
> >>>>> drive INQUIRY information, serial number and any position flags
> >>>>> (BOP, EOT, etc.) provided with the tape position information.
> >>>>> 'mt status -v' adds information on the maximum possible I/O size,
> >>>>> and the underlying values used to calculate it.
> >>>>> 
> >>>>> o The extra sa(4) /dev entries (/dev/saN.[0-3]) have been removed.
> >>>> 
> >>>> How does this affect a tape library with more than one tape drive?
> >>>> 
> >>>> [root@cuppy:~] # camcontrol amcontrol devlist
> >>>> <DEC TL800    (C) DEC 0525>        at scbus0 target 0 lun 0 (pass0,ch0)
> >>>> <DEC TZ89     (C) DEC 2561>        at scbus0 target 2 lun 0 (sa1,pass2)
> >>>> <WDC WD5000AAKS-00YGA0 12.01C02>   at scbus1 target 0 lun 0 (pass3,ada0)
> >>>> <WDC WD5000AAKS-00YGA0 12.01C02>   at scbus2 target 0 lun 0 (pass4,ada1)
> >>>> <AHCI SGPIO Enclosure 1.00 0001>   at scbus3 target 0 lun 0 (pass5,ses0)
> >>>> 
> >>>> This system has two tapes drives and I can access them through the front panel but:
> >>>> 
> >>>> # ls -l /dev/*sa*
> >>>> crw-rw----  1 root  operator  0x65 Feb 28 22:04 /dev/esa1
> >>>> crw-rw----  1 root  operator  0x64 Mar  1 22:43 /dev/nsa1
> >>>> crw-rw----  1 root  operator  0x63 Feb 28 22:04 /dev/sa1
> >>>> crw-rw----  1 root  operator  0x62 Feb 28 22:04 /dev/sa1.ctl
> >>>> 
> >>>> ... only one tape drives shows up.
> >>> 
> >>> 
> >>> Hmm.  The tape drive is listed as sa1, which implies that there may be an
> >>> sa0 that was there previously or is in the process of probing.  What does
> >>> dmesg show?  How about 'camcontrol devlist -v'?
> >> 
> >> # camcontrol devlist -v
> >> scbus0 on ahc0 bus 0:
> >> <DEC TL800    (C) DEC 0525>        at scbus0 target 0 lun 0 (pass0,ch0)
> >> <DEC TZ89     (C) DEC 2561>        at scbus0 target 2 lun 0 (sa1,pass2)
> >> <>                                 at scbus0 target -1 lun ffffffff ()
> >> scbus1 on ahcich2 bus 0:
> >> <WDC WD5000AAKS-00YGA0 12.01C02>   at scbus1 target 0 lun 0 (pass3,ada0)
> >> <>                                 at scbus1 target -1 lun ffffffff ()
> >> scbus2 on ahcich4 bus 0:
> >> <WDC WD5000AAKS-00YGA0 12.01C02>   at scbus2 target 0 lun 0 (pass4,ada1)
> >> <>                                 at scbus2 target -1 lun ffffffff ()
> >> scbus3 on ahciem0 bus 0:
> >> <AHCI SGPIO Enclosure 1.00 0001>   at scbus3 target 0 lun 0 (pass5,ses0)
> >> <>                                 at scbus3 target -1 lun ffffffff ()
> >> scbus-1 on xpt0 bus 0:
> >> <>                                 at scbus-1 target -1 lun ffffffff (xpt0)
> >> 
> >> 
> >> BUT!
> >> 
> >> # grep sa /var/run/dmesg.boot 
> >>  VT-x: (disabled in BIOS) PAT,HLT,MTF,PAUSE,EPT,UG,VPID
> >> module_register_init: MOD_LOAD (vesa, 0xffffffff80de3720, 0) error 19
> >> alc0: Using 1 MSIX message(s).
> >> isab0: <PCI-ISA bridge> at device 31.0 on pci0
> >> isa0: <ISA bus> on isab0
> >> orm0: <ISA Option ROM> at iomem 0xce800-0xcefff on isa0
> >> atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
> >> sa0 at ahc0 bus 0 scbus0 target 1 lun 0
> >> sa0: <DEC TZ89     (C) DEC 2561> Removable Sequential Access SCSI-2 device 
> >> sa0: Serial Number CXA22S2338
> >> sa0: 10.000MB/s transfers (10.000MHz, offset 15)
> >> sa0: quirks=0x100<NO_LONG_POS>
> >> sa1 at ahc0 bus 0 scbus0 target 2 lun 0
> >> sa1: <DEC TZ89     (C) DEC 2561> Removable Sequential Access SCSI-2 device 
> >> sa1: Serial Number CXA09S1340
> >> sa1: 10.000MB/s transfers (10.000MHz, offset 15)
> >> sa1: quirks=0x100<NO_LONG_POS>
> > 
> > If you run 'dmesg', you should have seen a message when it went away.  Perhaps
> > there will be something preceding it that will give us a clue about the
> > problem.  (Generally a selection timeout.)  At least this does show that
> > sa0 is at target 1, and so should not conflict with the library or sa1.
> 
> Ahh:
> 
> Trying to mount root from zfs:system/bootenv/FreeBSDHEad []...
> sa0 at ahc0 bus 0 scbus0 target 1 lun 0
> sa0: <DEC TZ89     (C) DEC 2561> s/n CXA22S2338 detached
> (sa0:ahc0:0:1:0): Periph destroyed
> arp: 10.55.0.60 moved from e4:ce:8f:46:f1:98 to 78:ca:39:fe:d6:b3 on em0
> arp: 10.55.0.60 moved from e4:ce:8f:46:f1:98 to 78:ca:39:fe:d6:b3 on em0
> arp: 10.55.0.60 moved from 78:ca:39:fe:d6:b3 to e4:ce:8f:46:f1:98 on em0
> (sa1:ahc0:0:2:0): 64512-byte tape record bigger than supplied buffer
> (sa1:ahc0:0:2:0): 10240-byte tape record bigger than supplied buffer

Okay.  Well, no indication of what happened.  Perhaps boot -v will show it,
perhaps not.

Ken
-- 
Kenneth Merry
ken@FreeBSD.ORG



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