(Will send any followup from now only to freebsd-scsi@ .)
Did some additional research and found that the disk failure indeed is
reported in MRSAS' "event log".
So my final question then is, how do you extract it into userland (in
the absence of an "mfiutil" as the MFI driver has)?
Details below. Thanks.
On 2016-02-14 19:59, Tinker wrote:
[...]
http://www.cisco.com/c/dam/en/us/td/docs/unified_computing/ucs/3rd-party/lsi/mrsas/userguide/LSI_MR_SAS_SW_UG.pdf
on page 305, that is section "A.2 Event Messages" - I don't know for
what LGI chip this document is, but, it does not list particular event
message very clearly for when an individual underlying disk would have
broken, I don't even see any event for when a hot spare would be taken
in use!
Wait - this page:
https://www.schirmacher.de/display/Linux/Replace+failed+disk+in+MegaRAID+array
(and also
http://serverfault.com/questions/485147/drive-is-failing-but-lsi-megaraid-controller-does-not-detect-it
)
gives an example of how the host system learns about broken disks:
Code: 0x00000051 .. Event Description: State change on VD 00/1 from
OPTIMAL(3) to DEGRADED(2)
Code: 0x00000072 .. Event Description: State change on PD 05(e0xfc/s0)
from ONLINE(18) to FAILED(11)
(unclean disk broken seems to be shown as:)
Code: 0x00000071 .. Event Description: Unexpected sense: PD 05(e0xfc/s0)
Path 4433221103000000, CDB: 2e 00 3a 38 1b c7 00 00 01 00, Sense:
b/00/00
And this version of the LSI documentation
http://hwraid.le-vert.net/raw-attachment/wiki/LSIMegaRAIDSAS/megacli_user_guide.pdf
gives a clearer definition of the physical and virtual drive states in
"1.4.16 Physical Drive States"
and "1.4.17 Virtual Disk States" on pages 1-11 to 1-12.
So as we see, a physical drive breaking would
* "FAILED" the physical drive
* "DEGRADED" the Virtual Drive (that is the logical exported drive)
(from "OPTIMAL")
So then, it was indeed the card's "event log" that contains this info.
Last question then would only be then, *where* FreeBSD's MRSAS driver
sends its event log?
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