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scsi.4: Document serial numbers

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You can wire da, ada and nda device units to serial numbers. sdda cannot
be wired like this because SD and MMC cards lack serial numbers (or at
the very least CAMMMC does not query or retain them).

Sponsored by:		Netflix
Reviewed by:		bcr
Differential Revision:	https://reviews.freebsd.org/D32825
This commit is contained in:
Warner Losh 2021-11-05 08:57:05 -06:00
parent c688a2eb2f
commit 15d4459cb2
1 changed files with 20 additions and 4 deletions
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24
share/man/man4/scsi.4
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@ -242,16 +242,32 @@ hint.nda.11.target="1"
hint.nda.11.unit="2"
.Ed
.Pp
This assigns the NVMe card living at PCI bus 7 to scbus 10 (in PCIe,
slot and function are rarely used and usually 0).
This assigns the NVMe card living at PCI bus 7 slot 0 function 1 to scbus 10.
The target for
.Xr nda 4
devices is always 1.
The unit is the namespace identifier from the drive.
The namespace id 1 is exported as
.Tn nda10
.Em nda10
and namespace id 2 is exported as
.Tn nda11 .
.Em nda11 .
.Pp
For devices that provide a serial number, units may be wired to that serial
number without regard where the drive is attached:
.Bd -literal -offset indent
hint.nda.3.sn="CY0AN07101120B12P"
hint.da.44.sn="143282400011"
hint.ada.2.sn="A065D591"
.Ed
wires
.Em nda3 ,
.Em da44 ,
and
.Em ada2
to drives with the specified serial numbers.
One need not specify an
.Em at
line when serial numbers are used.
.Sh ADAPTERS
The system allows common device drivers to work through many different
types of adapters.