To answer your third question, about how you might determine this
yourself, we had a similar question today about how exactly DMP
(Vertias' multipath software) fits into the stack, and just used dtrace.
There are probably other ways, but this is a pretty quick and easy.
Noelle Milton Vega wrote:
Hi:
See attached jpeg diagram.
Can someone enlighten me a bit. Im trying to piece together what the
I/O driver stack would look like diagrammatically (from top to bottom),
given certain installed device drivers.
(1) Can someone verify the following diagram below / attached?
Is it accurate (I suspect not entirely)?
(2) Does anyone have a good diagram for this?
(2) As *importantly* what procedure can I use in the future to piece
the diagram below together. For example, using modinfo(1M);
prtconf(1M); ls /dev/(r)dsk; /etc/path_to_inst(4), and other
commands/files; etc, how could one piece this connection/stack
information together (assume Solaris 8 and above).
Filesystem (no LVM) || Filesystem || RAW Disk || RAW Disk (no LVM)
==============================================================
SCSI-3 Driver (e.g. sd(7D); ssd(7D))
==============================================================
LVM Drivers (e.g. vxio (7D); md(7D))
==============================================================
I/O Multipathing Driver (e.g. scsi_vhci; vxdmp; emcp
==============================================================
SCSI to FibreChannel Conversion Nexus Driver
(e.g. fp(7D); qlc (7D))
==============================================================
HBA driver (e.g. lpfc; jnic; fcaw)
==============================================================
Regards,
Noel Milton Vega
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