Date: Mon, 2 Mar 2015 11:43:15 -0500 From: Dan Langille <dan@langille.org> To: "Kenneth D. Merry" <ken@FreeBSD.ORG> Cc: current@freebsd.org, scsi@freebsd.org Subject: Re: sa(4) driver changes available for test Message-ID: <30C55F00-2DE4-4596-96EA-2E3CC40B4DB6@langille.org> In-Reply-To: <20150302020608.GA73433@mithlond.kdm.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> <20150302020608.GA73433@mithlond.kdm.org>
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> On Mar 1, 2015, at 9:06 PM, Kenneth D. Merry <ken@FreeBSD.ORG> wrote: >=20 > On Sun, Mar 01, 2015 at 19:40:40 -0500, Dan Langille wrote: >>=20 >>> On Mar 1, 2015, at 7:36 PM, Kenneth D. Merry <ken@FreeBSD.ORG> = wrote: >>>=20 >>> On Sun, Mar 01, 2015 at 19:28:37 -0500, Dan Langille wrote: >>>>=20 >>>>> On Mar 1, 2015, at 7:18 PM, Kenneth D. Merry <ken@FreeBSD.ORG> = wrote: >>>>>=20 >>>>> On Sun, Mar 01, 2015 at 17:06:24 -0500, Dan Langille wrote: >>>>>>=20 >>>>>>> On Feb 13, 2015, at 7:32 PM, Kenneth D. Merry <ken@freebsd.org> = wrote: >>>>>>>=20 >>>>>>>=20 >>>>>>> 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. >>>>>>>=20 >>>>>>> A description of the changes is here and below in this message. >>>>>>>=20 >>>>>>> If you have tape hardware and the inclination, I'd appreciate = testing and >>>>>>> feedback. >>>>>>>=20 >>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>> Rough draft commit message: >>>>>>>=20 >>>>>>> = http://people.freebsd.org/~ken/sa_changes_commitmsg.20150213.3.txt >>>>>>>=20 >>>>>>> The patches against FreeBSD/head as of SVN revision 278706: >>>>>>>=20 >>>>>>> http://people.freebsd.org/~ken/sa_changes.20150213.3.txt >>>>>>>=20 >>>>>>> And (untested) patches against FreeBSD stable/10 as of SVN = revision 278721. >>>>>>>=20 >>>>>>> = http://people.freebsd.org/~ken/sa_changes.stable_10.20150213.3.txt >>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>=20 >>>>>>> The intent is to get the tape infrastructure more up to date, so = we can >>>>>>> support LTFS and more modern tape drives: >>>>>>>=20 >>>>>>> http://www.ibm.com/systems/storage/tape/ltfs/ >>>>>>>=20 >>>>>>> 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. >>>>>>>=20 >>>>>>> The commit message below outlines most of the changes. >>>>>>>=20 >>>>>>> A few comments: >>>>>>>=20 >>>>>>> 1. I'm planning to commit the XPT_DEV_ADVINFO changes = separately. >>>>>>>=20 >>>>>>> 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. >>>>>>>=20 >>>>>>> 3. I have tested with a reasonable amount of tape hardware (see = below for a >>>>>>> list), but more testing and feedback would be good. >>>>>>>=20 >>>>>>> 4. Standard 'mt status' output looks like this: >>>>>>>=20 >>>>>>> # 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 >>>>>>>=20 >>>>>>> 5. 'mt status -v' looks like this: >>>>>>>=20 >>>>>>> # 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 >>>>>>=20 >>>>>>=20 >>>>>> # 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=3DFAI260 = =20 >>>>>> Storage Element 5:Full :VolumeTag=3DFAI261 = =20 >>>>>> Storage Element 6:Full :VolumeTag=3DFAI262 = =20 >>>>>> Storage Element 7:Full :VolumeTag=3DFAI263 = =20 >>>>>> Storage Element 8:Empty >>>>>> Storage Element 9:Empty >>>>>> Storage Element 10:Empty >>>>>>=20 >>>>>>=20 >>>>>> It was at this point I spent the next 90 minute trying to get the = tape=20 >>>>>> 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. :/ >>>>>=20 >>>>> Thanks for all of the effort! Looks like it is paying off! :) >>>>>=20 >>>>>> When I do this command, I hear the drive move a bit, to read the = tape: >>>>>>=20 >>>>>> # 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 >>>>>=20 >>>>> Looks like the drive isn't reporting position information. It = will still >>>>> be useful to try it with Bacula, though. >>>>>=20 >>>>>> # mt -f /dev/nsa1 ostatus =20 >>>>>> 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 >>>>>>=20 >>>>>>=20 >>>>>> After doing a very small tar -c and tar -x, I have: >>>>>>=20 >>>>>> # 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 >>>>>=20 >>>>> Woohoo! It works. >>>>>=20 >>>>>> # 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 >>>>>>=20 >>>>>> I may not get to testing Bacula today. =20 >>>>>>=20 >>>>>> Based on the above, is there any commands you'd like me to try? >>>>>=20 >>>>> Aside from making sure things work okay with Bacula, that is = probably >>>>> sufficient. These drives won't support density reports or = position >>>>> information. >>>>>=20 >>>>>> Read below regarding two tape drives >>>>>>=20 >>>>>>>=20 >>>>>>> 6. Existing applications should work without changes. If not, = please let >>>>>>> me know. Hopefully they will move over time to the new = interfaces. >>>>>>>=20 >>>>>>> 7. There are lots of additional features that could be added = later. >>>>>>> Append-only support, encryption, more log pages, etc. >>>>>>>=20 >>>>>>> 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=20 >>>>>>> to the status XML from the sa(4) driver. >>>>>>>=20 >>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>> Significant upgrades to sa(4) and mt(1). >>>>>>>=20 >>>>>>> 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. >>>>>>>=20 >>>>>>> Significant changes and new features include: >>>>>>>=20 >>>>>>> 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. >>>>>>>=20 >>>>>>> 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. >>>>>>>=20 >>>>>>> o The extra sa(4) /dev entries (/dev/saN.[0-3]) have been = removed. >>>>>>=20 >>>>>> How does this affect a tape library with more than one tape = drive? >>>>>>=20 >>>>>> [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) >>>>>>=20 >>>>>> This system has two tapes drives and I can access them through = the front panel but: >>>>>>=20 >>>>>> # 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 >>>>>>=20 >>>>>> ... only one tape drives shows up. >>>>>=20 >>>>>=20 >>>>> 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'? >>>>=20 >>>> # 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) >>>>=20 >>>>=20 >>>> BUT! >>>>=20 >>>> # grep sa /var/run/dmesg.boot=20 >>>> 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=20 >>>> sa0: Serial Number CXA22S2338 >>>> sa0: 10.000MB/s transfers (10.000MHz, offset 15) >>>> sa0: quirks=3D0x100<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=20 >>>> sa1: Serial Number CXA09S1340 >>>> sa1: 10.000MB/s transfers (10.000MHz, offset 15) >>>> sa1: quirks=3D0x100<NO_LONG_POS> >>>=20 >>> 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. >>=20 >> Ahh: >>=20 >> 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 >=20 > Okay. Well, no indication of what happened. Perhaps boot -v will = show it, > perhaps not. >=20 Good news. After a reboot, both tape drives are present: $ ls -l /dev/*sa* crw-rw---- 1 root operator 0x61 Mar 2 17:27 /dev/esa0 crw-rw---- 1 root operator 0x65 Mar 2 17:27 /dev/esa1 crw-rw---- 1 root operator 0x60 Mar 2 17:27 /dev/nsa0 crw-rw---- 1 root operator 0x64 Mar 2 17:27 /dev/nsa1 crw-rw---- 1 root operator 0x5f Mar 2 17:27 /dev/sa0 crw-rw---- 1 root operator 0x5e Mar 2 17:27 /dev/sa0.ctl crw-rw---- 1 root operator 0x63 Mar 2 17:27 /dev/sa1 crw-rw---- 1 root operator 0x62 Mar 2 17:27 /dev/sa1.ctl =E2=80=94=20 Dan Langille http://langille.org/
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