Dear,
We were upgrading multipath-tools 0.4.9 to 0.5.0 on a dual node DRBD
cluster with SCST 3.1.0 ISCSI exports and three XEN VM nodes. All 5
servers running:
root@cenbersto002:/usr/src# uname -a
Linux cenbersto002 4.1.18 #1 SMP Sun Mar 27 10:16:46 CEST 2016 x86_64
GNU/Linux
For multipath 0.5.0 we cannot get the path priorities to work. Multipath
gives all of them the priority 50 no matter what and puts all paths in
one active group.
Is it a bug in 0.5.0 or did we still make a mistake in our upgraded
configuration file (we checked all documentation we could find and did
multiple tests)?
For 0.4.9 it still works fine on this upgraded platform. Then we get an
active group with prio 130 and an enabled failover group with prio 50.
Config 0.5.0:
root@cenbernod001:~# cat multipath.conf
devices {
device {
vendor "SCST_BIO"
# product "*"
# hardware_handler "1 alua"
# features "3 queue_if_no_path
pg_init_retries 50"
# path_selector "queue-length 0"
}
}
defaults {
polling_interval 10
path_selector "round-robin 0"
path_grouping_policy group_by_prio
uid_attribute "ID_SERIAL"
getuid_callout "/lib/udev/scsi_id --whitelisted
--device=/dev/%n"
prio alua
path_checker directio
no_path_retry queue
rr_min_io 100
rr_min_io_rq 100
flush_on_last_del no
max_fds 8192
rr_weight priorities
failback immediate
queue_without_daemon no
user_friendly_names no
mode 644
uid 0
gid disk
# hardware_handler "1 alua"
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
devnode "^sda$"
devnode "^sdb$"
# wwid 350014ee1aed0e771
# wwid 350014ee158048877
}
blacklist_exceptions {
# device {
# vendor SCST_BIO
# }
property "(ID_SCSI_VPD|ID_WWN|ID_SERIAL)"
devnode "^sd[c-z]+"
devnode "^sda[a-z]+"
devnode "^sdb[a-z]+"
}
multipaths {
multipath {
wwid 26534376437633839
alias cenbererpprd007
}
...
For multipath 0.4.9 we get the desired result:
cenbererbprd402 (26434373934373262) dm-44 SCST_BIO,cenbererbprd402
size=20G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=130 status=active
| |- 92:0:0:0 sdce 69:32 active ready running
| |- 93:0:0:0 sdcf 69:48 active ready running
| |- 150:0:0:0 sdek 128:192 active ready running
| `- 198:0:0:0 sdgg 131:192 active ready running
`-+- policy='round-robin 0' prio=50 status=enabled
|- 106:0:0:0 sdcs 70:0 active ready running
|- 107:0:0:0 sdct 70:16 active ready running
|- 157:0:0:0 sder 129:48 active ready running
`- 251:0:0:0 sdig 135:0 active ready running
Config 0.4.9:
root@cenbernod003:~# cat /etc/multipath.conf
devices {
device {
vendor "SCST_BIO"
# product "VIRTUAL-DISK"
}
}
##
## This is a template multipath-tools configuration file
## Uncomment the lines relevent to your environment
##
defaults {
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id --whitelisted
--device=/dev/%n"
prio alua
path_checker directio
rr_min_io 100
flush_on_last_del no
max_fds 8192
rr_weight priorities
failback immediate
no_path_retry queue
queue_without_daemon no
user_friendly_names no
mode 644
uid 0
gid disk
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
devnode "^sda$"
devnode "^sdb$"
}
multipaths {
multipath {
wwid 26534376437633839
alias cenbererpprd007
}
...
In SCST we have ALUA groups with preference to one of the two DRBD nodes
for each target:
DEVICE_GROUP cenbererbprd402 {
DEVICE cenbererbprd402
TARGET_GROUP cenbererbprd402 {
group_id 13
preferred 1
state active
TARGET cenbersto001:cenbererbprd402
}
}
Thanks a lot in advance.
Kind Regards,
Willem
--
Willem Verbruggen ANAGKY BVBA
Zaakvoerder Thaliastraat 71
+32 (0)497 54 96 36 2600 Antwerpen
willem.verbruggen@xxxxxxxxx BE 0894.681.775
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