At a customer I have to check through an older gentoo server.
The former admin is not available anymore and among other things I have
to check how the SAN storage is attached.
As I have to plan a new installation with minimal downtime I'd like to
understand that multipath-stuff before any changes ;-)
The system runs:
sys-fs/multipath-tools-0.5.0-r1
and has a multipath.conf:
(rm-ed comments)
defaults {
# udev_dir /dev
polling_interval 15
# selector "round-robin 0"
path_grouping_policy group_by_prio
failback 5
path_checker tur
# prio_callout "/sbin/mpath_prio_tpc /dev/%n"
rr_min_io 100
rr_weight uniform
no_path_retry queue
user_friendly_names yes
}
blacklist {
devnode cciss
devnode fd
devnode hd
devnode md
devnode sr
devnode scd
devnode st
devnode ram
devnode raw
devnode loop
devnode sda
devnode sdb
}
multipaths {
multipath {
wwid 3600c0ff0001e91b2c1bae25601000000
## To find your wwid, please use /usr/bin/sg_vpd --page=di /dev/DEVICE.
## The address will be a 0x6. Remove the 0x and replace it with 3.
alias MSA2040_SAMBA_storage
}
}
"multipath -l" and "-ll" show nothing.
dmesg:
# dmesg | grep multi
[ 1.144947] md: multipath personality registered for level -4
[ 1.145679] device-mapper: multipath: version 1.9.0 loaded
[ 1.145857] device-mapper: multipath round-robin: version 1.0.0 loaded
[21827451.284100] device-mapper: table: 253:0: multipath: unknown path
selector type
[21827451.285432] device-mapper: table: 253:0: multipath: unknown path
selector type
[21827496.130239] device-mapper: table: 253:0: multipath: unknown path
selector type
[21827496.131379] device-mapper: table: 253:0: multipath: unknown path
selector type
[21827497.576482] device-mapper: table: 253:0: multipath: unknown path
selector type
-
I see two devices sdc and sdd that should come from the SAN.
Could someone help me to research this in more detail?
This is a production server, I can't change much ...
I would like to find out how to reliably mount these SAN-devices into a
new OS (maybe a new gentoo installation is coming).
thanks, Stefan
