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Jur van der Burg Software Resources International softresint.eu

Disk partitioning on VMS with LDdriver OpenVMS Technical Update Days The Netherlands October 11,2006. Jur van der Burg Software Resources International www.softresint.eu. LDdriver: What can it do?. Use a file on any disk as a disk Use a range of logical blocks on a disk as a new disk

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Jur van der Burg Software Resources International softresint.eu

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  1. Disk partitioning on VMS with LDdriverOpenVMS Technical Update DaysThe NetherlandsOctober 11,2006 Jur van der Burg Software Resources International www.softresint.eu

  2. LDdriver: What can it do? • Use a file on any disk as a disk • Use a range of logical blocks on a disk as a new disk • Investigate I/O behavior • Test application error handling • Play around with disks without doing damage • Emulate a magtape on disk (V9.0, in development) • Create havoc (with privileges)

  3. Where can I find it? • On the OpenVMS freeware website http://www.hp.com/go/openvms/freeware • On the main lddriver site http://www.digiater.nl/lddriver • Integrated in VMS since V7.3-1(sort of....) • Fully integrated in VMS V8.2

  4. Preparation • Ready for use after @SYS$STARTUP:LD$STARTUP • Any command that needs the driver will give an error if not started properly: $ LD CONNECT FILE.DSK LDA1 %LD-F-INVOKESTARTUP, LD has not been setup correctly, invoke @SYS$STARTUP:LD$STARTUP.COM • Exceptions are LD HELP and LD CREATE • Version can be obtained like this: $ LD VERSION %LD-I-VERSION, LD version V9.0, module X-9 built on Oct 10 2006 13:46:25 -LD-I-DRIVERVERSION, Driver version: 10-OCT-2006 13:56:45.44 (MON version) -LD-I-SYSINFO, Node: THEBAT, Hardware: hp AlphaServer DS20L 833 MHz, VMS version: XB9P-BL2

  5. Basics – File mode • Use a file as a disk • Create a file on a physical disk: LD CREATE DKA100:[LD]DISK/SIZE=10000 • Connect the file to a device: LD CONNECT DKA100:[LD]DISK LDA1 • Use it: INIT LDA1: LDDISK MOUNT LDA1: LDDISK ..... DISMOUNT LDA1: • Disconnect the file: LD DISCONNECT LDA1

  6. Basics – LBN mode • Use a range of logical blocks as a disk • Physical disk may not be used by anything else • Connect a range of logical blocks to a disk: LD CONNECT DKA100:/LBN=(START=0,END=9999) LDA1 LD CONNECT DKA100:/LBN=(START=10000,END=19999) LDA2 LD CONNECT DKA100:/LBN=(START=20000,END=29999) LDA3 • Connect using a size: LD CONNECT DKA100:/LBN=(START=0,SIZE=10000) LDA1 LD CONNECT DKA100:/LBN=(START=10000,SIZE=10000) LDA2 LD CONNECT DKA100:/LBN=(START=20000,SIZE=10000) LDA3

  7. Basics – Replace mode • Access another disk via an LD device • Not a real form of partitioning • Useful for I/O tracing and watchpoints • Physical disk may not be used by anything else • Connect and replace: LD CONNECT DKA100:/REPLACE LDA1

  8. Advanced use • Sharing of LD devices in a cluster is possible • LD devices itself are not MSCP-served • For shared use the physical devices where the container file resides must be MSCP served • Shadowing host-based raid disks • LD devices may be nested, i.e. you can create an LD disk on an LD disk on an LD disk etc.

  9. Sharing LD devices • LD devices must be connected the same way on multiple nodes to allow sharing of container files • This means the same device name, allocation class, geometry, filename, etc. • Any mismatch will be detected by the driver • The utility attempts to give the reason for the failure $ ld connect $1$dga1: lda3:/lbn=(start=600,end=2000)/log/share %LD-F-DEVICEINUSE, Device incompatible connected to other LD disk in cluster -LD-F-RANGEINUSE, LBN range already in use

  10. I/O tracing • Very powerful feature to see what’s happening on a low level • Can be viewed real-time (continuously) • Can be logged to disk (unattended) • Flexible selectable output • different time formats • different I/O status block formats • different I/O function code formats

  11. I/O Tracing example $ ld trace lda1: ..... $ ld show/trace lda1 I/O trace for device $7$LDA1: 26-APR-2006 22:18:36.28 on node LDDRVR:: Start Time Elaps Pid Lbn Bytes Iosb Function -------------------------------------------------------------- 22:18:32.65 00.00 09C00227 0 0 NORMAL PACKACK|INHERLOG 22:18:32.65 00.01 09C00227 1 512 NORMAL READPBLK 22:18:32.66 00.00 09C00227 1034 512 NORMAL READPBLK 22:18:32.67 00.00 09C00227 5002 512 NORMAL READPBLK 22:18:32.68 00.00 09C00227 5002 512 NORMAL WRITEPBLK 22:18:32.69 00.00 09C00227 5003 1536 NORMAL READPBLK 22:18:32.69 00.00 09C00227 5006 512 NORMAL READPBLK 22:18:32.69 00.00 09C00227 5000 512 NORMAL READPBLK|EXFUNC 22:18:32.69 00.00 09C00227 0 0 NORMAL PACKACK|BYPASS_VALID_CHK 22:18:32.70 00.00 09C00227 5016 512 NORMAL READPBLK|EXFUNC 22:18:32.70 00.00 09C00227 5023 1024 NORMAL READPBLK 22:18:32.70 00.00 09C00227 5016 512 NORMAL WRITEPBLK|EXFUNC|DATACHECK

  12. Watchpoints • A watchpoint is a special action performed when a targeted logical block is hit by a request • These actions are possible: • Return a specific error • Suspend the I/O request • Generate an Opcom message • Crash the system (needs CMKRNL privilege) • The user controls which LBN is watched, on which function code is acted, and which error is returned • The ‘Opcom’ action may be combined with other actions

  13. Watchpoint example $ ld watch lda1 1/action=error=2928 $ ld watch lda1 1/action=opcom $ ld show/watch lda1 Index LBN Action Function Error return code -------------------------------------------------------------------- 1 1 Opcom READPBLK 2 1 Error READPBLK 0B70 (FISH) $ dump lda1:/block=(count=1,start=1) %%%%%%%%%%% OPCOM 5-APR-2006 14:21:46.70 %%%%%%%%%%% Message from user VDBURG on LDDRVR ***** LDdriver detected LBN watchpoint access ***** PID: 26000224 Image: DUMP Device: $7$LDA1: (LDDRVR) Function: 000C LBN: 1 %DUMP-E-READERR, error reading LDA1: -SYSTEM-W-FISH, my hovercraft is full of eels

  14. Callable interface • LDdriver is controlled by a user mode program issuing normal QIO requests • The required function codes and definitions are available in the kit, and in VMS since V8.2-1 ($LDDEF or lddef.h) • The driver is doing very strong validity checks of all requests (You can’t shoot yourself in the foot (if you can, I apologize, please let me know how you did it))

  15. Limits • Create as many devices as your diskspace allows • Creation of any device takes BYTLM quota from the creating process • The tracebuffer as well as watchpoints come out of non-paged pool and are charged against BYTLM as well • If 9999 LD devices are not enough then you can create LD devices on other controllers, like LDB1:, LDC1:, etc. • Configure the driver with @SYS$STARTUP:LD$STARTUP x where x is the controller to use.

  16. Old versions • LD V8.1: • LD CREATE/EXTEND Allows extension of existing container file Expand volume with SET VOLUME/SIZE • LD CONNECT/NOFORCED_ERROR Prevent handling of forced errors with shadowing • Bug fixes: • Fix possible system crash in I/O completion • Fix I/O hang with host-based raid • Fix mount verification issues

  17. Old versions • LD V8.2: • LD V8.2 has no new features when compared to V8.1 • It is only a bug fix release. • Properly expel shadowset members on error • Reconnecting an LD device could fail the first time after reboot if the container file was used on another node • Allow container file on an NFS mounted ODS5 volume • Prevent system crash on reconnecting a container file in a cluster

  18. New developments • LD V9.0: • Control utility rewritten in Ansi-C • More accurate timing in trace records (With VMS V8.3 and up) $ ld show/trace lda1 I/O trace for device $3$LDA1: 17-MAY-2006 09:21:15.16 on node THEBAT End Time Elaps Pid Lbn Bytes Iosb Function --------------------------------------------------------------------- 09:21:12.232269 00.000000 2060042F 0 0 NORMAL PACKACK 09:21:12.240950 00.008581 2060042F 1 512 NORMAL READPBLK 09:21:12.247513 00.006426 2060042F 1034 512 NORMAL READPBLK 09:21:12.248595 00.000959 2060042F 50033 512 NORMAL READPBLK 09:21:12.249557 00.000838 2060042F 50034 512 NORMAL READPBLK 09:21:12.255176 00.005504 2060042F 50016 512 NORMAL READPBLK 09:21:12.263548 00.008258 2060042F 50016 512 NORMAL WRITEPBLK

  19. New developments - cont • LD CREATE/ERASE Erase container file on creation. This has no effect if highwater marking is turned on. • LD CREATE will issue a warning if highwater-marking is turned on and the size of the container file is more than 100000 blocks (VMS V8.2 and up): %LD-W-HIGHWATER, Highwater marking is enabled on device, be patient • LD SHOW/FULL Will show all attributes of the selected LD device. $ ld show/all/full %LD-I-CONNECTED, Connected _$3$LDA1: to $1$DGA100:[JUR.LD.V90.SRC]FILE.DSK;1 -LD-I-OPTIONS, Shared %LD-I-CONNECTED, Connected _$3$LDA2: to _$3$DQA0: -LD-I-OPTIONS, Replaced, Trace active, No DSE support, Not Forced Error capable

  20. New developments - cont • LD SHOW/SYMBOL Get the LD unit number in DCL symbol LD_UNIT, and the container file specification in the symbol LD_CONTAINER. • LD SHOW/TRACE/TIMESTAMP=START or END Allow display of absolute start and end time of trace data. • LD CONNECT/LOGICAL=(NAME=logical-name [,TABLE=table] [,MODE=mode]) Assign logical name to LD device at connect time

  21. New developments – Tape emulation • Emulate tape device • Device is called ‘LM’ (Logical Magtape) • Uses the same driver as LD • One single driver acts like a disk or tape (!) $ lm create tape1/size=10000 $ lm connect tape1 lma1/log %LM-I-CONNECTED, Connected $3$LMA1: to $1$DGA100:[JUR.LD.V90.SRC]TAPE1.DSK;1 $ show dev/fu lma1 Magtape $3$LMA1: (THEBAT), device type (Generic SCSI tape), is online, file- oriented device. Error count 0 Operations completed 2 Owner process "" Owner UIC [JUR] Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W Reference count 0 Default buffer size 2048 Density 6666 Format Normal-11 Allocation class 12 Volume status: no-unload on dismount, odd parity.

  22. New developments – Tape emulation $ init lma1 test $ lm trace lma1 $ mount/foreign lma1 %MOUNT-I-MOUNTED, TEST mounted on _$3$LMA1: (THEBAT) $ dismount lma1: $ lm show/trace lma1: I/O trace for device $3$LMA1: 10-OCT-2006 14:38:17.05 on node THEBAT Start Time Elaps Pid Lbn Bytes Iosb Function ------------------------------------------------------------- 14:38:11.10 00.00 2020042A 0 0 NORMAL PACKACK 14:38:11.10 00.00 2020042A 0 0 NORMAL REWIND 14:38:11.10 00.00 2020042A 0 0 NORMAL PACKACK 14:38:11.10 00.00 2020042A 0 0 NORMAL REWIND 14:38:11.10 00.01 00000000 0 524288 NORMAL READPBLK 14:38:11.11 00.00 2020042A 0 80 NORMAL READPBLK 14:38:11.11 00.00 2020042A 0 80 NORMAL READPBLK 14:38:11.11 00.00 2020042A 0 80 NORMAL READPBLK 14:38:11.11 00.00 2020042A 0 80 ENDOFFILE READPBLK 14:38:11.11 00.00 2020042A 0 0 NORMAL REWIND 14:38:11.11 00.00 2020042A 0 0 NORMAL REWIND 14:38:14.71 00.00 2020042A 0 0 NORMAL UNLOAD|CLSEREXCP 14:38:14.71 00.00 2020042A 0 0 NORMAL AVAILABLE

  23. New developments – Tape emulation • LM SWITCH LMA1 newfile.dsk • Allows volume switching for backup • LM ANALYZE file.dsk [/FULL] • Verifies the integrity of the container file $ lm analyze file.dsk %LM-I-ANALYZEOK, Container file structure successfully verified

  24. New developments – Tape emulation • This is where we are right now. • Backup support will follow soon. $ copy/log 10mb.bin lma1: %COPY-S-COPIED, DATA:[JUR.LD.V90.SRC]10MB.BIN;1 copied to LMA1: (163840 records) $ set magtape/rewind lma1: $ copy/log lma1: 10mb.new %COPY-S-COPIED, LMA1: copied to DATA:[JUR.LD.V90.SRC]10MB.NEW;1 (163840 records) $ diff/mode=hex 10mb.bin 10mb.new Number of difference sections found: 0 Number of difference records found: 0 DIFFERENCES /IGNORE=()/MERGED=1/MODE=(HEXADECIMAL)- DATA:[JUR.LD.V90.SRC]10MB.BIN;1- DATA:[JUR.LD.V90.SRC]10MB.NEW;1

  25. New developments – Tape emulation $ init lma2 test $ back/log DATA:[JUR.LD.V90.KIT]*.* lma2:lm/save/rewind/ignore=label %MOUNT-I-MOUNTED, TEST mounted on _$3$LMA2: (THEBAT) %BACKUP-I-LBLOVRWRITE, volume label TEST overwritten, new label is LM %MOUNT-I-MOUNTED, LM mounted on _$3$LMA2: (THEBAT) %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]BIGDISK.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_FILE.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_FILE_SHADOW.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_FILE_SHARE.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_FILE_SHARE_LOCK.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_FILE_TRACE.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_LBN.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_LBN_SHARE.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_MOUNTVER.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]LD_REPLACE.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]MOUNTVER.COM;1 %BACKUP-S-COPIED, copied DATA:[JUR.LD.V90.KIT]SHADOW_RAM.COM;1 $ lm analyze file.dsk %LM-I-ANALYZEOK, Container file structure successfully verified

  26. Internals – connecting a container file • The most tricky part is connecting an LD device to a container file • Container file physical device must be a mounted disk • It must contain a known file system • File must be mapped with cathedral windows • Caching must be disabled for this file • Check for usage on other cluster members • File ID • Allocation class • Device name / controller letter / unit number • Geometry • Maximum block size • Sharing • Mode of connection

  27. Internals – connecting a disk by LBN • Connecting part of a disk by LBN range needs other checks • Physical device may not be mounted • It may not be accessed on any other node • The logical block range must fit and may not be in use anywhere in the cluster • The exception is that parts that match exactly may be shared • After connecting the physical device is guarded against access with a lock which prevents mounting

  28. Internals – checking LBN range (1) • When connecting a part of a physical disk we need to check availability of the logical blocks, clusterwide • We can’s take out a lock based on a resource name with the encoded range as we don’t know what’s used on other nodes • We don’t want to invoke a helper process – driver check only! • We can’t store all ranges in a valueblock • So we use the lockmanager in a smart way

  29. Internals – checking LBN range (2) • At connection time the block range we want is entered in a lock value block • By taking out a lock a blocking AST routine is fired on other nodes with interest in the same device • The blocking routine scans all local LD devices for a matching device • If found the LBN range is checked • In case of an error a bit is set in the lock value block • After lock conversion the initiator examines the error bit and rejects the request if set

  30. Internals – Finding an I/O • LDdriver sends most I/O requests it receives directly to the physical disk driver • This may happen for multiple file segments in parallel • This can make it harder to find an active I/O • IRP’s forwarded to the physical disk can be found in the LDIOB structure • LDdriver’s structure definitions can be found in SYS$LDDRIVER.STB (only after installing the LD kit)

  31. SDA> read/exec SDA> show device lda2 ... SDA> format/typ=ldiob @(ucb+ucb$l_ld_aiofl) FFFFFFFF.81DDE140 LDIOB$L_QFL 81DD9800 UCB+00200 FFFFFFFF.81DDE144 LDIOB$L_QBL 81DD9800 UCB+00200 FFFFFFFF.81DDE148 LDIOB$W_SIZE 0080 FFFFFFFF.81DDE14A LDIOB$B_TYPE 13 FFFFFFFF.81DDE14B LDIOB$B_SPARE 53 FFFFFFFF.81DDE14C LDIOB$L_IRP 81DB1780 FFFFFFFF.81DDE150 LDIOB$L_PID 0001002B LNM$C_DEL_OVERLAY+00027 FFFFFFFF.81DDE154 LDIOB$L_MEDIA 00000000 FFFFFFFF.81DDE158 LDIOB$L_BCNT 00000200 FFFFFFFF.81DDE15C LDIOB$W_FUNC 000C FFFFFFFF.81DDE15E LDIOB$W_IOST 0001 FFFFFFFF.81DDE160 LDIOB$Q_STAT 00000000.00000000 FFFFFFFF.81DDE168 LDIOB$Q_ST_TIME 00000000.00000000 FFFFFFFF.81DDE170 LDIOB$Q_EN_TIME 000000A8.00010025 FFFFFFFF.81DDE178 LDIOB$Q_ST_SCC 00000000.1C10E15D FFFFFFFF.81DDE180 LDIOB$Q_EN_SCC 44070017.34465003 FFFFFFFF.81DDE188 LDIOB$L_ST_CPU 00000000 FFFFFFFF.81DDE18C LDIOB$L_EN_CPU 00000000 FFFFFFFF.81DDE190 LDIOB$L_ELAPSED 00000000 LDIOB$Q_ELAPSED FFFFFFFF.81DDE194 00000000 FFFFFFFF.81DDE198 LDIOB$Q_ST_USEC 613D6500.746C7561 FFFFFFFF.81DDE1A0 LDIOB$Q_EN_USEC 2F657461.642F6C6C FFFFFFFF.81DDE1A8 LDIOB$L_ABCNT 00000000 Number of bytes transferred so far FFFFFFFF.81DDE1AC LDIOB$L_KPB 81C5C9C0 FFFFFFFF.81DDE1B0 LDIOB$L_FWDQFL 81DC0878 Queue of forwared IRP's FFFFFFFF.81DDE1B4 LDIOB$L_FWDQBL 81DC0878 FFFFFFFF.81DDE1B8 LDIOB$W_IRPCNT 0001 Number of active forwarded IRP's FFFFFFFF.81DDE1BA LDIOB$W_FLAGS 0000 SDA> format @(@(ucb+ucb$l_ld_aiofl)+ldiob$l_fwdqfl)-irp$l_ld_fwdqfl FFFFFFFF.81DC0640 IRP$L_IOQFL 81DC5BA0 FFFFFFFF.81DC0644 IRP$L_IOQBL 81DC5BA0 FFFFFFFF.81DC0648 IRP$W_SIZE 0240 FFFFFFFF.81DC064A IRP$B_TYPE 0A FFFFFFFF.81DC064B IRP$B_RMOD 00 FFFFFFFF.81DC064C IRP$L_PID 81B278F0 SYS$LDDRIVER+118F0 ...

  32. Which VMS versions? • Runs on VAX/VMS since V5.5-2 • Alpha V6.1 and higher • IA64 V8.2 and higher • The current kit is HP-VMS-LD-V0802--1.PCSI • Installs on: • VAX V7.3 • Alpha V7.2-2 V7.3 V7.3-1 V7.3-2 V8.2 • Ia64 V8.2 V8.2-1

  33. Other versions • Other versions may work too, but the driver and utility needs to be built from source (included in the kit) • Build procedure is included • C compiler required • Driver may need an edit for specific versions (enable / disable a conditional) • LD V9.0 will NOT run on VAX! • LD V8.2 will be the last release for VAX/VMS • LD V8.2 is integrated in the VMS V8.3 release

  34. Known issues • V8.2: • If the XFC cache is turned off (VCC_FLAGS != 2) then connecting a file will return this error: • %LD-F-BLKOUTOFRANGE, Blocks out of range • This problem is corrected in VMS V8.3 and the future LD V9.0 kit

  35. HP internal usage • Heavily used for testing • Used in the VMS build • Host-based Infoserver • CDRECORD • COPY/RECORDABLE_MEDIA (CDDVD)

  36. Futures • Bug fixes (if any....) • You name it.... suggestions are welcome (buy me a drink )

  37. More information • LDDRIVER article in the HP technical journal (V6) http://www.hp.com/go/openvms/journal • After installation: $ LD HELP • Keep an eye on the website for the V9.0 release. http://www.digiater.nl/lddriver • Questions / Bugs / Ideas? Email: lddriver@digiater.nl

  38. LD_FILE.COM $ ld create disk1.dsk /size=5000 $ ld connect disk1.dsk lda1: $ ld show lda1: $ ld trace lda1: $ init lda1: test $ mount lda1: test $ dir lda1:[000000] $ ld show/trace lda1: $ ld trace/reset lda1: $ dismount lda1: $ ld show/trace lda1: $ ld disconnect lda1: $ delete disk1.dsk;

  39. LD_FILE_SHARE.COM $ if f$search("disk1.dsk") .eqs. "" $ then $ ld create disk1.dsk /size=5000 $ ld connect disk1.dsk lda1:/share/alloclass=4/log $ init lda1: test $ else $ ld connect disk1.dsk lda1:/share/alloclass=4/log $ endif $ mount/system lda1: test $ show dev lda1 $ inquire dummy "return to continue" $ dismount lda1: $ ld disconnect/log lda1: $ if f$search("disk1.dsk") .nes. "" then delete disk1.dsk;

  40. LD_FILE_SHARE_LOCK.COM $ if f$search("disk1.dsk") .eqs. "" $ then $ ld create disk1.dsk /size=5000 $ ld connect disk1.dsk lda1:/share/alloclass=4/log/lock $ init lda1: test $ else $ ld connect disk1.dsk lda1:/share/alloclass=4/log/lock $ endif $ mount/system lda1: test $ show dev lda1 $ inquire dummy "return to continue" $ dismount lda1: $ ld disconnect/log lda1: $ if f$search("disk1.dsk") .nes. "" then delete disk1.dsk;

  41. LD_FILE_TRACE.COM $ on control_y then goto exit $ ld create disk1.dsk /size=5000 $ ld connect disk1.dsk lda1:/log $ init lda1: test $ mount lda1: test $ ld trace lda1: $loop: $ dir lda1:[000000] $ wait 0:0:5 $ analyze/disk lda1: $ wait 0:0:5 $ goto loop $ dismount lda1: $exit: $ set noon $ dismount lda1: $ ld trace/stop lda1: $ ld disconnect lda1: $ delete disk1.dsk;

  42. LD_FILE_SHADOW.COM $ ld create disk1.dsk /size=5000 $ ld create disk2.dsk /size=5000 $ ld connect disk1.dsk lda1:/log/alloclass=4 $ ld connect disk2.dsk lda2:/log/alloclass=4 $ ld trace lda1: $ ld trace lda2: $ init lda1: test $ mount dsa0:/shadow=($4$lda1:,$4$lda2:) test $ ld show/trace lda1: $ ld show/trace lda2: $ ld trace/reset lda1: $ ld trace/reset lda2: $ show shadow/copy $ inquire dummy "return to continue" $ dismount dsa0: $ ld show/trace lda1: $ ld show/trace lda2: $ ld disconnect lda1: $ ld disconnect lda2: $ delete disk1.dsk; $ delete disk2.dsk;

  43. LD_LBN.COM $ phdev := $9$dka400: $ show dev 'phdev' $ ld connect 'phdev' lda1:/log/lbn=(start=0,count=10000) $ ld connect 'phdev' lda2:/log/lbn=(start=10000,count=10000) $ ld connect 'phdev' lda3:/log/lbn=(start=20000,count=10000) $ ld connect 'phdev' lda4:/log/lbn=(start=30000,count=10000) $ init lda1: test1 $ init lda2: test2 $ init lda3: test3 $ init lda4: test4 $ mount lda1: test1 $ mount lda2: test2 $ mount lda3: test3 $ mount lda4: test4 $ show dev lda1 $ show dev lda2 $ show dev lda3 $ show dev lda4 $ show dev 'phdev' $ inquire dummy "return to continue" $ dismount lda1: $ dismount lda2: $ dismount lda3: $ dismount lda4: $ ld disconnect/log/all $ show dev 'phdev'

  44. LD_LBN_SHARE.COM $ phdev := $9$dka400: $ show dev 'phdev' $ ld connect 'phdev' lda1:/log/lbn=(start=0,count=10000)/share/alloclass=4 $ ld connect 'phdev' lda2:/log/lbn=(start=10000,count=10000)/share/alloclass=4 $ ld connect 'phdev' lda3:/log/lbn=(start=20000,count=10000)/share/alloclass=4 $ ld connect 'phdev' lda4:/log/lbn=(start=30000,count=10000)/share/alloclass=4 $ mount/system lda1: test1 $ mount/system lda2: test2 $ mount/system lda3: test3 $ mount/system lda4: test4 $ show dev lda1 $ show dev lda2 $ show dev lda3 $ show dev lda4 $ show dev 'phdev' $ inquire dummy "return to continue" $ dismount lda1: $ dismount lda2: $ dismount lda3: $ dismount lda4: $ ld disconnect/log/all $ show dev 'phdev'

  45. LD_REPLACE.COM $ phdev := $9$dka400: $ show dev 'phdev' $ ld connect 'phdev' lda1:/log/replace $ ld trace lda1: $ init lda1: test1 $ mount lda1: test1 $ show dev/full lda1 $ show dev/full 'phdev' $ ld show/trace lda1: $ inquire dummy "return to continue" $ dismount lda1: $ ld disconnect/log lda1: $ show dev 'phdev'

  46. LD_MOUNTVER.COM $ ld create disk1.dsk $ ld connect/log/symbol disk1.dsk $ init/nohigh/system lda'ld_unit': test $ mount lda'ld_unit': test $ ld trace lda'ld_unit': $ ld watch lda'ld_unit': 1/action=error=%x84/function=code=%x0808 $ ld watch lda'ld_unit': 10/action=error=%x84/function=read $ ld watch lda'ld_unit': 10/action=opcom/function=read $ ld show/watch lda'ld_unit': $ reply/enable/temp $ spawn/nowait/input=nl: dump lda'ld_unit':/block=(start=10,count=1) $ inquire dummy "return to continue" $ ld nowatch lda'ld_unit': $ ld show/trace lda'ld_unit': $ reply/disable $ wait 0:0:1 $ dism lda'ld_unit': $ set noon $ ld trace/stop lda'ld_unit': $ ld disc lda'ld_unit': $ delete/nolog/noconf disk1.dsk;

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