sa(4) driver changes available for test
Kenneth D. Merry
ken at FreeBSD.ORG
Mon Aug 24 21:31:17 UTC 2015
On Mon, Aug 24, 2015 at 17:24:22 -0400, Dan Langille wrote:
>
> > On Mar 2, 2015, at 12:26 PM, Kenneth D. Merry <ken at freebsd.org> wrote:
> >
> > On Mon, Mar 02, 2015 at 11:43:15 -0500, Dan Langille wrote:
> >>
> >>> On Mar 1, 2015, at 9:06 PM, Kenneth D. Merry <ken at FreeBSD.ORG> wrote:
> >>>
> >>> 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 at 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 at 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 at 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 at 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
>
> Ken,
>
> FYI, I upgraded a 9.3 server to 10.2 yesterday. A message similar to the above is seen here:
>
> (sa0:sym0:0:1:0): 64512-byte tape record bigger than supplied buffer
>
> Is this just informational? If so, I'll ignore it.
Yes, it's informational. It tells you that your tape blocks are 64512
bytes long. Or at least the first one is.
The initial tape mount inside the sa(4) driver does a test read with an 8K
buffer. This is to get the drive to actually look at the media, so it will
know what is there. (This is necessary on some older drives.)
We don't necessarily expect that the initial read will read in a whole
block, but the sense data that comes back from the tape drive will tell you
how big the first block is at least.
We could silence it, or perhaps use a bigger (e.g. MAXPHYS) buffer, so
you'd get an error in the case where we can't read the blocksize written
to the tape. I think it is somewhat helpful to know how big the blocksize
is.
Ken
--
Kenneth Merry
ken at FreeBSD.ORG
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