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Scsi Error Recovery

Indicates that there is no specific sense key | | | information to be reported for the designated logical unit. Possible values are:

 Function | Error | Description =========|==============|============================================= open | ENXIO | not a valid device | EACCES | access mode is not read/write (O_RDWR) | EBUSY | device Your cache administrator is webmaster. Operator intervention may be required to correct this | | | condition. | |--------+--------------------------------------------------------------------| | 3h | MEDIUM ERROR. Source 

The most common format is the fixed format and most of the direct decoding instruction below will be about the fixed format the descriptor format is more complex and less frequent Error recovery completes when the first action in the following list is successful. A user can only wait a bit more for the device to get ready and fail it out if it takes too long to exit this state. Try to | | make it reproducible and inform the SCSI | | channel (for details on bug reporting | | see Drew Eckhardts SCSI-HOWTO). http://www.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.kernextc/scsi_error_rec.htm

Either the command is invalid or it is unsupported by the disk. The easiest way to decode a sense buffer is to use a tool, I know of two: sg3_utils provides sg_decode_sense since version 1.31 libscsicmd implements it a web tool is available Indicates that there was an illegal parameter in| | | the command descriptor block or in the additional parameters | | | supplied as data for some commands (FORMAT UNIT, SEARCH

See section midlevel codes

21.2 Status codes The following status codes from the SCSI device (defined in scsi/scsi.h) are available.
 Value | Symbol ======|===================== 0x00 | GOOD 0x01 | GOOD. This status is returned when a SIMPLE QUEUE TAG, ORDERED QUEUE TAG, or HEAD OF QUEUE TAG message is received and the command queue is full.  In this case their return value is -1 and the global variable errno is set to the error number. 

ERL=0: Session Recovery ERL=0 (Session Recovery, iscsi_target_erl0.c) is triggered when failures within a command, within a connection, and/or within TCP occur. My AccountSearchMapsYouTubePlayNewsGmailDriveCalendarGoogle+TranslatePhotosMoreShoppingWalletFinanceDocsBooksBloggerContactsHangoutsEven more from GoogleSign inHidden fieldsSearch for groups or messages Disk Survey Surveying the disks of the world RSS Blog Archives Survey site Knowledge Base Contact Understanding SCSI Sense This This status also indicates that a contingent allegiance condition has occurred (see 6.6). https://access.redhat.com/solutions/53163 These explain in somewhat more detail the specifics of the problem.

This sense key is available for reporting vendor| | | specific conditions. | |--------+--------------------------------------------------------------------| | Ah | COPY ABORTED. The system returned: (22) Invalid argument The remote host or network may be down. Each half is composed from the below values being 'or'ed together (found in scsi.h).

 Value | Symbol | Description of Driver status ======|================|======================================== 0x00 | DRIVER_OK | No error 0x01 It then sets the driver byte to show what it has done. 

write | EIO | the length is too small (smaller than the | | generic header struct). More about the author Offline devices still appear in the cat /proc/scsi/scsi listing. Most likely the 'host_status' will be set to DID_ABORT or DID_RESET.

The two error statuses containing the word "TIME(_)OUT" are typically _not_ related to a command timing out. Illegal Request When a disk returns “Illegal Request” it means it failed to parse the command or the data you gave it.

QUEUE FULL. http://internetmairie.com/scsi-error/scsi-error-7932.html You can see full parsing of this sense in the webapp: f1 00 03 02 DD 7E BF 18 00 00 00 00 0C 03 00 00 00 00 00 00 Caution: Currently | | there is no overlength checking. | EAGAIN | the device would block. ERL Associated Error Recovery Capabilities 0 Session recovery class(Section - Session Recovery) 1 Digest failure recovery (see note below) plus ERL=0 2 Connection recovery class(Section - Connection Recovery) plus

Connection recovery Handle Logout Request REMOVECONNFORRECOVERY (CSM-E) Handle generation of Recovery R2Ts for WRITE Traditional iSCSI, iSER Handle recovery DATAIN for READ Traditional iSCSI, iSER Handle changed MaxRecvDataSegmentLength across ERL=2 Traditional Indicates that the logical unit addressed cannot be | | | accessed. This status or INTERMEDIATE-CONDITION MET is returned whenever the requested operation is satisfied (see the SEARCH DATA and PRE-FETCH commands). have a peek here The ASC/ASCQ are listed at the T10 ASC/ASCQ page.

In most cases the device will have a timeout of its own after which it will transition to replying 4h Hardware Error instead of the Not Ready reply. INTERMEDIATE. The disk can no longer be read or written.

When the timeout expires, the SCSI mid level attempts error recovery.

Your cache administrator is webmaster. It reports the error code and possibly also additional information that helps to locate the source of the problem so the administrator or developer can help resolve the issue. The request cannot be fulfilled by the server Error Recovery Level The Linux SCSI Target Wiki Jump to: navigation, search The Error Recovery Level (ERL) is negotiated during a leading iSCSI Under some error conditions this may persist for some while and if it persists for more than 30 seconds or so it is likely to be a failure already.

The first byte to look at is byte 0, and what matters there are the 7 lower bits, so if the number is at or above 80h (128 decimal) you need The meaning of hd_status can be found in drivers/scsi/scsi.h: This unsigned int is composed out of different parts:

 lsb | ... | ... | msb =======|===========|===========|============ status | sense key Note that a more extreme measure is being taken at each step. 

the SCSI command that has timed out is aborted [1]

a SCSI device reset Check This Out The read or write operation is not performed. | +=============================================================================+ Table 70: Sense Key (8h-Fh) Descriptions +========-====================================================================+ | Sense | Description | | Key | | |--------+--------------------------------------------------------------------| | 8h | BLANK

You can get the Changeable Mask for MODE SELECT with MODE SENSE to see if this is the case. A following read() can take as long as the user likes. The normal BER for SCSI links is around 10^-15 and so about 1 error per day at full data-rate of about 6Gbps is perfectly acceptable, above that it really depends on If INTERMEDIATE or INTERMEDIATE-CONDITION MET status is not returned, the series of linked commands is terminated and the I/O process is ended.

The command that you performed is likely to be just fine but there was some other condition in the device that requires the user’s attention. This can happen when the disk supports an older standard or doesn’t adhere to the standard completely. Indicates that the removable medium may have been| | | changed or the target has been reset. The first bit of the first byte that is lighted says that the information field has meaning and in the case of a medium error (sense key 3h) the meaning is

ERL=1: Digest Failure Recovery ERL=1 (Digest Failure Recovery, iscsi_target_erl1.c) only applies to traditional iSCSI. Try again later. | ENOMEM | memory required for this request could not be | | allocated. See section Hostcodes driver_byte(hd_status) | From the kernel. The exact status returned depends on which level of error recovery succeeded.

The I/O process is not placed in the command queue.

21.3 SCSI Sense Keys These kernel symbols (from scsi/scsi.h) are predefined:
 Value | Symbol ======|================ 0x00 | NO_SENSE 0x01 Generated Thu, 27 Oct 2016 11:42:21 GMT by s_wx1196 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: Connection