CTLADM(8) System Manager's Manual CTLADM(8) NAME ctladm -- CAM Target Layer control utility SYNOPSIS ctladm <command> [target:lun] [generic args] [command args] ctladm tur <target:lun> [general options] ctladm inquiry <target:lun> [general options] ctladm reqsense <target:lun> [general options] ctladm reportluns <target:lun> [general options] ctladm read <target:lun> [general options] <-l lba> <-d datalen> <-f file|-> <-b blocksize_bytes> [-c cdbsize] [-N] ctladm write <target:lun> [general options] <-l lba> <-d datalen> <-f file|-> <-b blocksize_bytes> [-c cdbsize] [-N] ctladm bbrread <target:lun> [general options] <--l lba> <--d datalen> ctladm readcap <target:lun> [general options] [-c cdbsize] ctladm modesense <target:lun> <-m page | -l> [-P pc] [-d] [-S subpage] [-c size] ctladm start <target:lun> [general options] [-i] [-o] ctladm stop <target:lun> [general options] [-i] [-o] ctladm synccache <target:lun> [general options] [-l lba] [-b blockcount] [-r] [-i] [-c cdbsize] ctladm shutdown [general options] ctladm startup [general options] ctladm hardstop ctladm hardstart ctladm lunlist ctladm delay <target:lun> <-l datamove|done> <-t secs> [-T oneshot|cont] ctladm realsync <on|off|query> ctladm setsync interval <target:lun> <-i interval> ctladm getsync <target:lun> ctladm inject <-i action> <-p pattern> [-r lba,len] [-s len fmt [args]] [-c] [-d delete_id] ctladm create <-b backend> [-B blocksize] [-d device_id] [-l lun_id] [-o name=value] [-s size_bytes] [-S serial_num] [-t device_type] ctladm remove <-b backend> <-l lun_id> [-o name=value] ctladm modify <-b backend> <-l lun_id> <-s size_bytes> ctladm devlist [-b backend] [-v] [-x] ctladm port [-l] [-o on|off] [-w wwpn] [-W wwnn] [-p targ_port] [-t fe_type] [-q] [-x] ctladm dumpooa ctladm dumpstructs ctladm help DESCRIPTION The ctladm utility is designed to provide a way to access and control the CAM Target Layer (CTL). It provides a way to send SCSI commands to the CTL layer, and also provides some meta-commands that utilize SCSI commands. (For instance, the lunlist command is implemented using the SCSI REPORT LUNS and INQUIRY commands.) The ctladm utility has a number of primary functions, many of which require a device identifier. The device identifier takes the following form: target:lun Specify the target (almost always 0) and LUN number to op- erate on. Many of the primary functions of the ctladm utility take the following op- tional arguments: -C retries Specify the number of times to retry a command in the event of failure. -D device Specify the device to open. This allows opening a device other than the default device, /dev/cam/ctl, to be opened for sending commands. -I id Specify the initiator number to use. By default, ctladm will use 7 as the initiator number. Primary commands: tur Send the SCSI TEST UNIT READY command to the device and report whether or not it is ready. inquiry Send the SCSI INQUIRY command to the device and display some of the returned inquiry data. reqsense Send the SCSI REQUEST SENSE command to the device and display the returned sense information. reportluns Send the SCSI REPORT LUNS command to the device and display supported LUNs. read Send a SCSI READ command to the device, and write the re- quested data to a file or stdout. -l lba Specify the starting Logical Block Address for the READ. This can be specified in decimal, oc- tal (starting with 0), hexadecimal (starting with 0x) or any other base supported by str- toull(3). -d datalen Specify the length, in 512 byte blocks, of the READ request. -f file Specify the destination for the data read by the READ command. Either a filename or `-' for std- out may be specified. -c cdbsize Specify the minimum SCSI CDB (Command Data Block) size to be used for the READ request. Allowable values are 6, 10, 12 and 16. Depend- ing upon the LBA and amount of data requested, a larger CDB size may be used to satisfy the re- quest. (e.g., for LBAs above 0xffffffff, READ(16) must be used to satisfy the request.) -b blocksize Specify the blocksize of the underlying SCSI de- vice, so the transfer length can be calculated accurately. The blocksize can be obtained via the SCSI READ CAPACITY command. -N Do not copy data to ctladm from the kernel when doing a read, just execute the command without copying data. This is to be used for perfor- mance testing. write Read data from a file or stdin, and write the data to the de- vice using the SCSI WRITE command. -l lba Specify the starting Logical Block Address for the WRITE. This can be specified in decimal, octal (starting with 0), hexadecimal (starting with 0x) or any other base supported by str- toull(3). -d atalen Specify the length, in 512 byte blocks, of the WRITE request. -f file Specify the source for the data to be written by the WRITE command. Either a filename or `-' for stdin may be specified. -c cdbsize Specify the minimum SCSI CDB (Command Data Block) size to be used for the READ request. Allowable values are 6, 10, 12 and 16. Depend- ing upon the LBA and amount of data requested, a larger CDB size may be used to satisfy the re- quest. (e.g., for LBAs above 0xffffffff, READ(16) must be used to satisfy the request.) -b blocksize Specify the blocksize of the underlying SCSI de- vice, so the transfer length can be calculated accurately. The blocksize can be obtained via the SCSI READ CAPACITY command. -N Do not copy data to ctladm to the kernel when doing a write, just execute the command without copying data. This is to be used for perfor- mance testing. bbrread Issue a SCSI READ command to the logical device to potentially force a bad block on a disk in the RAID set to be recon- structed from the other disks in the array. This command should only be used on an array that is in the normal state. If used on a critical array, it could cause the array to go offline if the bad block to be remapped is on one of the disks that is still active in the array. The data for this particular command will be discarded, and not returned to the user. In order to determine which LUN to read from, the user should first determine which LUN the disk with a bad block belongs to. Then he should map the bad disk block back to the logical block address for the array in order to determine which LBA to pass in to the bbrread command. This command is primarily intended for testing. In practice, bad block remapping will generally be triggered by the in-ker- nel Disk Aerobics and Disk Scrubbing code. -l lba Specify the starting Logical Block Address. -d datalen Specify the amount of data in bytes to read from the LUN. This must be a multiple of the LUN blocksize. readcap Send the SCSI READ CAPACITY command to the device and display the device size and device block size. By default, READ CA- PACITY(10) is used. If the device returns a maximum LBA of 0xffffffff, however, ctladm will automatically issue a READ CAPACITY(16), which is implemented as a service action of the SERVICE ACTION IN(16) opcode. The user can specify the mini- mum CDB size with the -c argument. Valid values for the -c option are 10 and 16. If a 10 byte CDB is specified, the re- quest will be automatically reissued with a 16 byte CDB if the maximum LBA returned is 0xffffffff. modesense Send a SCSI MODE SENSE command to the device, and display the requested mode page(s) or page list. -m page Specify the mode page to display. This option and the -l option are mutually exclusive. One of the two must be specified, though. Mode page numbers may be specified in decimal or hexadecimal. -l Request that the list of mode pages supported by the device be returned. This option and the -m option are mutually exclusive. One of the two must be specified, though. -P pc Specify the mode page page control value. Possi- ble values are: 0 Current values. 1 Changeable value bitmask. 2 Default values. 3 Saved values. -d Disable block descriptors when sending the mode sense request. -S subpage Specify the subpage used with the mode sense re- quest. -c cdbsize Specify the CDB size used for the mode sense re- quest. Supported values are 6 and 10. start Send the SCSI START STOP UNIT command to the specified LUN with the start bit set. -i Set the immediate bit in the CDB. Note that CTL does not support the immediate bit, so this is primarily use- ful for making sure that CTL returns the proper error. -o Set the Copan proprietary on/offline bit in the CDB. When this flag is used, the LUN will be marked online again (see the description of the shutdown and startup commands). When this flag is used with a start command, the LUN will NOT be spun up. You need to use a start command without the -o flag to spin up the disks in the LUN. stop Send the SCSI START STOP UNIT command to the specified LUN with the start bit cleared. We use an ordered tag to stop the LUN, so we can guarantee that all pending I/O executes before it is stopped. (CTL guarantees this anyway, but ctladm sends an ordered tag for completeness.) -i Set the immediate bit in the CDB. Note that CTL does not support the immediate bit, so this is primarily use- ful for making sure that CTL returns the proper error. -o Set the Copan proprietary on/offline bit in the CDB. When this flag is used, the LUN will be spun down and taken offline ("Logical unit not ready, manual interven- tion required"). See the description of the shutdown and startup options. synccache Send the SCSI SYNCHRONIZE CACHE command to the device. By de- fault, SYNCHRONIZE CACHE(10) is used. If the specified start- ing LBA is greater than 0xffffffff or the length is greater than 0xffff, though, SYNCHRONIZE CACHE(16) will be used. The 16 byte command will also be used if the user specifies a 16 byte CDB with the -c argument. -l lba Specify the starting LBA of the cache region to synchronize. This option is a no-op for CTL. If you send a SYNCHRONIZE CACHE command, it will sync the cache for the entire LUN. -b blockcount Specify the length of the cache region to syn- chronize. This option is a no-op for CTL. If you send a SYNCHRONIZE CACHE command, it will sync the cache for the entire LUN. -r Specify relative addressing for the starting LBA. CTL does not support relative address- ing, since it only works for linked commands, and CTL doesn't support linked commands. -i Tell the target to return status immediately after issuing the SYHCHRONIZE CACHE command rather than waiting for the cache to finish syncing. CTL does not support this bit. -c cdbsize Specify the minimum CDB size. Valid values are 10 and 16 bytes. shutdown Issue a SCSI START STOP UNIT command with the start bit cleared and the on/offline bit set to all direct access LUNs. This will spin down all direct access LUNs, and mark them of- fline ("Logical unit not ready, manual intervention re- quired"). Once marked offline, the state can only be cleared by sending a START STOP UNIT command with the start bit set and the on/offline bit set. The ctladm commands startup and start will accomplish this. Note that the on/offline bit is a non-standard Copan extension to the SCSI START STOP UNIT com- mand, so merely sending a normal start command from an initia- tor will not clear the condition. (This is by design.) startup Issue a SCSI START STOP UNIT command with the start bit set and the on/offline bit set to all direct access LUNs. This will mark all direct access LUNs "online" again. It will not cause any LUNs to start up. A separate start command without the on/offline bit set is necessary for that. hardstop Use the kernel facility for stopping all direct access LUNs and setting the offline bit. Unlike the shutdown command above, this command allows shutting down LUNs with I/O active. It will also issue a LUN reset to any reserved LUNs to break the reservation so that the LUN can be stopped. shutdown com- mand instead. hardstart This command is functionally identical to the startup command described above. The primary difference is that the LUNs are enumerated and commands sent by the in-kernel Front End Target Driver instead of by ctladm. lunlist List all LUNs registered with CTL. Because this command uses the ioctl port, it will only work when the FETDs (Front End Target Drivers) are enabled. This command is the equivalent of doing a REPORT LUNS on one LUN and then an INQUIRY on each LUN in the system. delay Delay commands at the given location. There are two places where commands may be delayed currently: before data is trans- ferred ("datamove") and just prior to sending status to the host ("done"). One of the two must be supplied as an argument to the -l option. The -t option must also be specified. -l delayloc Delay command(s) at the specified location. This can either be at the data movement stage (datamove) or prior to command completion (done). -t delaytime Delay command(s) for the specified number of seconds. This must be specified. If set to 0, it will clear out any previously set delay for this particular location (datamove or done). -T delaytype Specify the delay type. By default, the delay option will delay the next command sent to the given LUN. With the -T cont option, every com- mand will be delayed by the specified period of time. With the -T oneshot the next command sent to the given LUN will be delayed and all subse- quent commands will be completed normally. This is the default. realsync Query and control CTL's SYNCHRONIZE CACHE behavior. The `query' argument will show whether SYNCHRONIZE CACHE commands are being sent to the backend or not. The default is to send SYNCHRONIZE CACHE commands to the backend. The `on' argument will cause all SYNCHRONIZE CACHE commands sent to all LUNs to be sent to the backend. The `off' argument will cause all SYNCHRONIZE CACHE commands sent to all LUNs to be immediately returned to the initiator with successful status. setsync For a given lun, only actually service every Nth SYNCHRONIZE CACHE command that is sent. This can be used for debugging the optimal time period for sending SYNCHRONIZE cache com- mands. An interval of 0 means that the cache will be flushed for this LUN every time a SYNCHRONIZE CACHE command is re- ceived. You must specify the target and LUN you want to modify. getsync Get the interval at which we actually service the SYNCHRONIZE CACHE command, as set by the setsync command above. The re- ported number means that we will actually flush the cache on every Nth SYNCHRONIZE CACHE command. A value of 0 means that we will flush the cache every time. You must specify the target and LUN you want to query. inject Inject the specified type of error for the LUN specified, when a command that matches the given pattern is seen. The sense data returned is in either fixed or descriptor format, depend- ing upon the status of the D_SENSE bit in the control mode page (page 0xa) for the LUN. Errors are only injected for commands that have not already failed for other reasons. By default, only the first command matching the pattern specified is returned with the supplied error. If the -c flag is specified, all commands matching the pattern will be returned with the specified error until the error in- jection command is deleted with -d flag. -i action Specify the error to return: aborted Return the next matching com- mand on the specified LUN with the sense key ABORTED COMMAND (0x0b), and the ASC/ASCQ 0x45,0x00 ("Select or reselect failure"). mediumerr Return the next matching com- mand on the specified LUN with the sense key MEDIUM ERROR (0x03) and the ASC/ASCQ 0x11,0x00 ("Unrecovered read error") for reads, or ASC/ASCQ 0x0c,0x02 ("Write error - auto reallocation failed") for write errors. ua Return the next matching com- mand on the specified LUN with the sense key UNIT ATTENTION (0x06) and the ASC/ASCQ 0x29,0x00 ("POWER ON, RESET, OR BUS DEVICE RESET OCCURRED"). custom Return the next matching com- mand on the specified LUN with the supplied sense data. The -s argument must be specified. -p pattern Specify which commands should be returned with the given error. read The error should apply to READ(6), READ(10), READ(12), READ(16), etc. write The error should apply to WRITE(6), WRITE(10), WRITE(12), WRITE(16), WRITE AND VER- IFY(10), etc. rw The error should apply to both read and write type commands. readcap The error should apply to READ CAPACITY(10) and READ CAPAC- ITY(16) commands. tur The error should apply to TEST UNIT READY commands. any The error should apply to any command. -r lba,len Specify the starting lba and length of the range of LBAs which should trigger an er- ror. This option is only applies when read and/or write patterns are specified. If used with other command types, the error will never be triggered. -s len fmt [args] Specify the sense data that is to be re- turned for custom actions. If the format is `-', len bytes of sense data will be read from standard input and written to the sense buffer. If len is longer than 252 bytes (the maximum allowable SCSI sense data length), it will be truncated to that length. The sense data format is described in cam_cdparse(3). -c The error injection should be persistent, instead of happening once. Persistent er- rors must be deleted with the -d argument. -d delete_id Delete the specified error injection serial number. The serial number is returned when the error is injected. port Perform one of several CTL frontend port operations. Either get a list of frontend ports (-l), turn one or more frontends on or off (-o on|off), or set the World Wide Node Name (-w wwnn) or World Wide Port Name (-W wwpn) for a given port. One of -l, -o, or -w or -W must be specified. The WWNN and WWPN may both be specified at the same time, but cannot be combined with enabling/disabling or listing ports. -l List all CTL frontend ports or a specific port type or number. -o on|off Turn the specified CTL frontend ports off or on. If no port number or port type is specified, all ports are turned on or off. -p targ_port Specify the frontend port number. The port num- bers can be found in the frontend port list. -q Omit the header in the port list output. -t fe_type Specify the frontend type. Currently defined port types are "fc" (Fibre Channel), "scsi" (Parallel SCSI), "ioctl" (CTL ioctl interface), and "internal" (CTL CAM SIM). -w wwnn Set the World Wide Node Name for the given port. The -n argument must be specified, since this is only possible to implement on a single port. As a general rule, the WWNN should be the same across all ports on the system. -W wwpn Set the World Wide Port Name for the given port. The -n argument must be specified, since this is only possible to implement on a single port. As a general rule, the WWPN must be different for every port in the system. -x Output the port list in XML format. dumpooa Dump the OOA (Order Of Arrival) queue for each LUN registered with CTL. dumpstructs Dump the CTL structures to the console. create Create a new LUN. The backend must be specified, and depend- ing upon the backend requested, some of the other options may be required. If the LUN is created successfully, the LUN con- figuration will be displayed. If LUN creation fails, a mes- sage will be displayed describing the failure. -b backend The -b flag is required. This specifies the name backend to use when creating the LUN. Examples are "ramdisk" and "block". -B blocksize Specify the blocksize of the backend in bytes. -d device_id Specify the LUN-associated string to use in the SCSI INQUIRY VPD page 0x83 data. -l lun_id Request that a particular LUN number be as- signed. If the requested LUN number is not available, the request will fail. -o name=value Specify a backend-specific name/value pair. Multiple -o arguments may be specified. Refer to the backend documentation for arguments that may be used. -s size_bytes Specify the size of the LUN in bytes. Some backends may allow setting the size (e.g. the ramdisk backend) and for others the size may be implicit (e.g. the block backend). -S serial_num Specify the serial number to be used in the SCSI INQUIRY VPD page 0x80 data. -t device_type Specify the numeric SCSI device type to use when creating the LUN. For example, the Di- rect Access type is 0. If this flag is not used, the type of LUN created is backend-spe- cific. Not all LUN types are supported. Cur- rently CTL only supports Direct Access (type 0) and Processor (type 3) LUNs. The backend requested may or may not support all of the LUN types that CTL supports. remove Remove a LUN. The backend must be specified, and the LUN num- ber must also be specified. Backend-specific options may also be specified with the -o flag. -b backend Specify the backend that owns the LUN to be removed. Examples are "ramdisk" and "block". -l lun_id Specify the LUN number to remove. -o name=value Specify a backend-specific name/value pair. Multiple -o arguments may be specified. Refer to the backend documentation for arguments that may be used. modify Modify a LUN size. The backend, the LUN number, and the size must be specified. -b backend Specify the backend that owns the LUN to be removed. Examples are "ramdisk" and "block". -l lun_id Specify the LUN number to remove. -s size_bytes Specify the size of the LUN in bytes. For the "block" backend, an "auto" keyword may be passed instead; this will make CTL use the size of backing file or device. devlist Get a list of all configured LUNs. This also includes the LUN size and blocksize, serial number and device ID. -b backend Specify the backend. This restricts the LUN list to the named backend. Examples are "ramdisk" and "block". -v Be verbose. This will also display any backend- specific LUN attributes in addition to the stan- dard per-LUN information. -x Dump the raw XML. The LUN list information from the kernel comes in XML format, and this option allows the display of the raw XML data. This op- tion and the -v and -b options are mutually ex- clusive. If you specify -x, the entire LUN data- base is displayed in XML format. help Display ctladm usage information. EXAMPLES ctladm tur 0:1 Send a SCSI TEST UNIT READY command to LUN 1. ctladm modesense 0:1 -l Display the list of mode pages supported by LUN 1. ctladm modesense 0:0 -m 10 -P 3 -d -c 10 Display the saved version of the Control mode page (page 10) on LUN 0. Disable fetching block descriptors, and use a 10 byte MODE SENSE command instead of the default 6 byte command. ctladm read 0:2 -l 0 -d 1 -b 512 -f - > foo Read the first 512 byte block from LUN 2 and dump it to the file foo. ctladm write 0:3 -l 0xff432140 -d 20 -b 512 -f /tmp/bar Read 10240 bytes from the file /tmp/bar and write it to target 0, LUN 3. starting at LBA 0xff432140. ctladm create -b ramdisk -s 10485760000000000 Create a LUN with the "fake" ramdisk as a backing store. The LUN will claim to have a size of approximately 10 terabytes. ctladm create -b block -o file=src/usr.sbin/ctladm/ctladm.8 Create a LUN using the block backend, and specify the file src/usr.sbin/ctladm/ctladm.8 as the backing store. The size of the LUN will be derived from the size of the file. ctladm create -b block -o file=src/usr.sbin/ctladm/ctladm.8 -S MYSERIAL321 -d MYDEVID123 Create a LUN using the block backend, specify the file src/usr.sbin/ctladm/ctladm.8 as the backing store, and specify the SCSI VPD page 0x80 and 0x83 serial number (-S) and device ID (-d). ctladm remove -b block -l 12 Remove LUN 12, which is handled by the block backend, from the system. ctladm devlist List configured LUNs in the system, along with their backend and serial number. This works when the Front End Target Drivers are enabled or dis- abled. ctladm lunlist List all LUNs in the system, along with their inquiry data and device type. This only works when the FETDs are enabled, since the commands go through the ioctl port. ctladm inject 0:6 -i mediumerr -p read -r 0,512 -c Inject a medium error on LUN 6 for every read that covers the first 512 blocks of the LUN. ctladm inject 0:6 -i custom -p tur -s 18 "f0 0 02 s12 04 02" Inject a custom error on LUN 6 for the next TEST UNIT READY command only. This will result in a sense key of NOT READY (0x02), and an ASC/ASCQ of 0x04,0x02 ("Logical unit not ready, initializing command required"). SEE ALSO cam(3), cam_cdbparse(3), cam(4), xpt(4), camcontrol(8) HISTORY The ctladm utility was originally written during the Winter/Spring of 2003 as an interface to CTL. AUTHORS Ken Merry <ken@FreeBSD.org> FreeBSD 9.1 March 6, 2012 CTLADM(8)
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