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vdev_id: multi-lun disks & slot num zero pad 

Add ability to generate disk names that contain both a slot number
and a lun number in order to support multi-actuator SAS hard drives
with multiple luns. Also add the ability to zero pad slot numbers to
a desired digit length for easier sorting.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Heller <matthew.f.heller@accre.vanderbilt.edu>
Closes #16603
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Matthew Heller 2024-10-08 20:43:04 -04:00 committed by GitHub
parent 75dda92dc3
commit cefef28e98
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2 changed files with 24 additions and 4 deletions
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10
man/man5/vdev_id.conf.5
View File

@ -92,6 +92,11 @@ before a generic mapping for the same slot.
In this way a custom mapping may be applied to a particular channel
and a default mapping applied to the others.
.
.It Sy zpad_slot Ar digits
Pad slot numbers with zeros to make them
.Ar digits
long, which can help to make disk names a consistent length and easier to sort.
.
.It Sy multipath Sy yes Ns | Ns Sy no
Specifies whether
.Xr vdev_id 8
@ -122,7 +127,7 @@ device is connected to.
The default is
.Sy 4 .
.
.It Sy slot Sy bay Ns | Ns Sy phy Ns | Ns Sy port Ns | Ns Sy id Ns | Ns Sy lun Ns | Ns Sy ses
.It Sy slot Sy bay Ns | Ns Sy phy Ns | Ns Sy port Ns | Ns Sy id Ns | Ns Sy lun Ns | Ns Sy bay_lun Ns | Ns Sy ses
Specifies from which element of a SAS identifier the slot number is
taken.
The default is
@ -138,6 +143,9 @@ use the SAS port as the slot number.
use the scsi id as the slot number.
.It Sy lun
use the scsi lun as the slot number.
.It Sy bay_lun
read the slot number from the bay identifier and append the lun number.
Useful for multi-lun multi-actuator hard drives.
.It Sy ses
use the SCSI Enclosure Services (SES) enclosure device slot number,
as reported by

18
udev/vdev_id
View File

@ -124,6 +124,7 @@ TOPOLOGY=
BAY=
ENCL_ID=""
UNIQ_ENCL_ID=""
ZPAD=1
usage() {
cat << EOF
@ -154,7 +155,7 @@ map_slot() {
if [ -z "$MAPPED_SLOT" ] ; then
MAPPED_SLOT=$LINUX_SLOT
fi
printf "%d" "${MAPPED_SLOT}"
printf "%0${ZPAD}d" "${MAPPED_SLOT}"
}
map_channel() {
@ -430,6 +431,15 @@ sas_handler() {
d=$(eval echo '$'{$i})
SLOT=$(echo "$d" | sed -e 's/^.*://')
;;
"bay_lun")
# Like 'bay' but with the LUN number appened. Added for SAS
# multi-actuator HDDs, where one physical drive has multiple
# LUNs, thus multiple logical drives share the same bay number
i=$((i + 2))
d=$(eval echo '$'{$i})
LUN="-lun$(echo "$d" | sed -e 's/^.*://')"
SLOT=$(cat "$end_device_dir/bay_identifier" 2>/dev/null)
;;
"ses")
# look for this SAS path in all SCSI Enclosure Services
# (SES) enclosures
@ -460,7 +470,7 @@ sas_handler() {
if [ -z "$CHAN" ] ; then
return
fi
echo "${CHAN}"-"${JBOD}"-"${SLOT}${PART}"
echo "${CHAN}"-"${JBOD}"-"${SLOT}${LUN}${PART}"
else
CHAN=$(map_channel "$PCI_ID" "$PORT")
SLOT=$(map_slot "$SLOT" "$CHAN")
@ -468,7 +478,7 @@ sas_handler() {
if [ -z "$CHAN" ] ; then
return
fi
echo "${CHAN}${SLOT}${PART}"
echo "${CHAN}${SLOT}${LUN}${PART}"
fi
}
@ -748,6 +758,8 @@ if [ -z "$BAY" ] ; then
BAY=$(awk '($1 == "slot") {print $2; exit}' "$CONFIG")
fi
ZPAD=$(awk '($1 == "zpad_slot") {print $2; exit}' "$CONFIG")
TOPOLOGY=${TOPOLOGY:-sas_direct}
# Should we create /dev/by-enclosure symlinks?