Using scsi_command() A SCSI device driver sends SCSI commands to its device by storing information in a scsi_request structure and passing the structure to the scsi_command() function for the adapter. A subsequent attempt to open() that device name will yield ENODEV. The type of pack_id is int. If the file descriptor is in O_NONBLOCK state, rather than wait this ioctl() will yield EAGAIN.
The units of this value are milliseconds. This section documents the functional interface to the host adapter driver. Furthermore most modern chip-sets used in SCSI adapters completely hide this value. mmap()mmap(void * start, size_t length, int prot, int flags, int sg_fd, off_t offset).† This system call returns a pointer to the beginning of the reserved buffer associated with the sg file https://www.ibm.com/support/knowledgecenter/POWER7/p7hcd/fc5714appendeld.htm
SG_FLAG_MMAP_IO When set the driver will attempt to procure the reserved buffer. At boot time, the host adapter driver discovers the complement of devices by probing the bus. Programming exampleD.
The 'offset' argument must be set to 0 (or NULL). DebuggingE. The logic to do mmap-ed IO _assumes_ that an appropriate mmap() call has been made by the application. Robtest Commands Status=SCSI reservation conflict This needs to be our area of focus.
They all start with "SG_". Nmp_throttlelogfordevice It is important to realize that a CHECK CONDITION may vary in severity from informative (e.g. By default, read() will return the oldest completed request that is queued up. https://kb.vmware.com/kb/289902 HBA drivers may use a recent SCSI feature called autosense rather than issuing a REQUEST SENSE.
The contents of these tables is documented here for reference, and to assist in decoding messages from SCSI drivers. Auto Empty Media Access Port Request Rejected By Tldcd, Unable To Sense Robotic Device Known Issues: Some 6GB SAS HBAs are not compatable mpt_sas driver as details in Oracles Technote: ¬†http://docs.oracle.com/cd/E19253-01/821-0382/821-0382.pdf TapeAlert/Tape Alert ¬†¬† ¬† A tape alert message is a critical, warning, or informational The driver adds more vertexes connected to this one to represent the logical devices. However, a SCSI driver uses additional services, including those of the host adapter driver, and its configuration is slightly different from other drivers.
SC_TIMEOUT The device did not respond to selection within 250 milliseconds. https://www.veritas.com/support/en_US/article.TECH169477 Offline devices still appear in the cat /proc/scsi/scsi listing. Scsi Decoder Note that there are error conditions that don't result in a sense buffer be generated. Robot Inventory Failed: Unable To Sense Robotic Device (202) For the definition of the older sg_header interface see the sg version 2 documentation.
The value SG_DXFER_TO_DEV should be used when data is being moved from user memory towards the device (e.g. If sg_header interface is being used then the default queue depth is 1. Nor does it have to detach any devices it has attached. If the scan command shows devices appearing and re-appearing, then the passthrough driver is not the cause. ¬†If the device(s) permanently disappear, it may be worth reconfiguring the passthrough driver. ¬†If State In Doubt; Requested Fast Path State Update
Logical Unit Numbers (LUNs) When the target is a controller, it manages one or more subdevices, each one a logical unit of that target. It is provided so the user can identify the request. No Yes How can we make this article more helpful? The following pseudo code shows code that is useful for scanning the sg devices, taking care not to be caught in a wait for an O_EXCL lock by another process, and
Applications that scan sg devices trying to determine their identity (e.g. Robot Inventory Failed: Unable To Open Robotic Path (201) the SCSI error message) and it is prefixed with "sg_cmd_done_bh". ls -l /hw/module/1/slot/io1/baseio/pci/0/scsi_ctlr/0/target/1/lun/0 total 0 drwxr-xr-x 2 root sys 0 Mar 12 14:30 disk crw------- 1 root sys 0,116 Mar 12 14:30 scsi The character device scsi represents the addressable LUN.
EINTR o While waiting for the O_EXCL lock to clear this call was interrupted by a signal. This is reasonably complex to handle and is discussed in the ioctl(SG_SET_KEEP_ORPHAN) description below. A (possibly later) version of this document can be found at www.torque.net/sg/p/sg_v3_ho.html. Robotic Library Is Down On Server This can be bypassed by opening O_NONBLOCK.
When powering the host and robot back on, bring the robot online first. The tape cannot be unloaded, the /var/adm/message log will show: ¬† Mar 14 12:49:38 server02 tldcd: [ID 559682 daemon.notice] TLD(2) closing/unlocking robotic path Mar 14 12:49:38¬† server02 tldcd: [ID 919746 daemon.notice] The exact status returned depends on which level of error recovery succeeded. The user makes a call to fetch the result of the request.
Check the Event Viewer/system log for any hardware related errors. The MAP_PRIVATE flag does not play well with compiler optimization flags such as '-O2'. These steps are described in more detail in the following sections: "Configuring a SCSI Driver" "About Registration" "About Attaching a Device" "Opening a SCSI Device" "About Detaching a Device" "About Unloading The sr_status field should be tested first.
Solution It is important to understand that NetBackup does not write data directly to a tape drive. In all systems, DMA mapping hardware allows a SCSI adapter to treat discontiguous memory locations as if they were a contiguous buffer, providing scatter and gather support. The robtest command does not issue any NetBackup commands. ¬†It only sends operating system level SCSI commands to the library, and the output seen from the command is sent from the So for backward compatibility a file descriptor that only receives sg_header structures in its write() will have a default "max" queue length of 1.
SRF_AEN_ACK is a synonym that may appear in older code. The sr_notify function is the first to inspect the values summarized in Table 16-5. For SCSI devices, the kernel looks through a list of drivers that have registered as supporting SCSI devices of the particular type.