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SCSI Retry on BUSY

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chakri
Occasional Contributor

SCSI Retry on BUSY

Hi,

observed the following scsi error messages on system. could some one explain me who prints this messages ( driver or SCSI fiber channel firmware) and what does task abort, target reset, bus reset means...

kernel: [0:0:0:0] SCSI Retry on BUSY
kernel: mptscsih: ioc0: attempting task abort! (sc=ffff8101303b1800)
kernel: sd 0:0:0:0:
kernel: command: cdb[0]=0x2a: 2a 00 00 07 68 9a 00 00 08 00
kernel: mptscsih: ioc0: task abort: SUCCESS (sc=ffff8101303b1800)
kernel: mptscsih: ioc0: attempting target reset! (sc=ffff8101303b1800)
kernel: sd 0:0:0:0:
kernel: command: cdb[0]=0x2a: 2a 00 00 07 68 9a 00 00 08 00
kernel: mptscsih: ioc0: Issue of TaskMgmt failed!
kernel: mptscsih: ioc0: target reset: FAILED (sc=ffff8101303b1800)
kernel: mptscsih: ioc0: attempting target reset! (sc=ffff8101303b19c0)
kernel: sd 0:0:0:1:
kernel: command: cdb[0]=0x2a: 2a 00 00 06 68 b0 00 00 18 00
kernel: mptscsih: ioc0: Issue of TaskMgmt failed!
kernel: mptscsih: ioc0: target reset: FAILED (sc=ffff8101303b19c0)
kernel: mptscsih: ioc0: attempting target reset! (sc=ffff8101193ce500)
watchdog[1363]: still alive after 464640 seconds = 46464 interval(s)
kernel: sd 0:0:0:2:
kernel: command: cdb[0]=0x2a: 2a 00 25 54 48 10 00 04 00 00
kernel: mptscsih: ioc0: Issue of TaskMgmt failed!
kernel: mptscsih: ioc0: target reset: FAILED (sc=ffff8101193ce500)
kernel: mptscsih: ioc0: attempting bus reset! (sc=ffff8101303b1800)
kernel: sd 0:0:0:0:
kernel: command: cdb[0]=0x2a: 2a 00 00 07 68 9a 00 00 08 00
kernel: mptscsih: ioc0: bus reset: SUCCESS (sc=ffff8101303b1800)

1 REPLY
Matti_Kurkela
Honored Contributor
Solution

Re: SCSI Retry on BUSY

All the messages prefixed by "kernel:" come from the kernel. As they're related to SCSI, they obviously come from some parts of the kernel's SCSI subsystem.

The messages prefixed by "kernel: mptscsih: " come from the SCSI driver that handles LSI Fusion MPT SCSI interfaces. The driver is a part of the SCSI subsystem, which is a part of the kernel. You can find these messages in the Linux kernel source, in the file
kernel-/drivers/message/fusion/mptscsih.c
if you're interested.

The message prefixed by "watchdog[1363]" is not related to the SCSI problem: it comes from the system watchdog process, which is running on PID 1363. It looks like an informational message, not an error.

Task abort: the driver says "stop whatever you're doing" to the SCSI disk (or whatever SCSI target device).

Target reset: the driver commands the SCSI disk to reset itself.

Bus reset: the driver resets the entire SCSI bus, causing *all* SCSI devices on that bus to reset. This operation has more force to clear temporary problems than a target reset, but it stops all data traffic on the bus until the reset is complete, so the driver uses it only if the target reset did not help.

MK
MK