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I am attempting to implement dm-multipath on a RHEL4U6
server and I have been successful in enabling it on the second of 2 LUNs on the
server but for whatever reason it will not create the device special files in
/dev/mapper for the fist LUN. `multipath –d` shows that it identifies
the first LUN and wants to create the mpath0 files: [root@svwdcvispay01 etc]# multipath -d create: mpath0 (36005076801810085c800000000000194) [size=12 GB][features="1
queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [prio=50] \_ 1:0:0:0 sda 8:0 [ready] \_ round-robin 0 [prio=10] \_ 1:0:1:0 sdc 8:32 [ready] switchpg: mpath1 (36005076801810085c8000000000001a2) [size=50 GB][features="1
queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [prio=50] \_ 1:0:1:1 sdd 8:48 [active][ready] \_ round-robin 0 [prio=10] \_ 1:0:0:1 sdb 8:16 [active][ready] [root@svwdcvispay01 etc]# However `multipath –v3` generates a “set
ACT_CREATE: map does not exists” error in the mpath0 section: [root@svwdcvispay01 etc]# multipath -v3 load path identifiers cache # # all paths in cache : # 36005076801810085c800000000000194 1:0:0:0 sda 8:0
IBM /2145 36005076801810085c8000000000001a2 1:0:0:1 sdb 8:16
10 [active] IBM /2145 36005076801810085c800000000000194 1:0:1:0 sdc
8:32 IBM /2145 36005076801810085c8000000000001a2 1:0:1:1 sdd 8:48
50 [active] IBM /2145 dm-0 blacklisted dm-1 blacklisted dm-2 blacklisted dm-3 blacklisted dm-4 blacklisted md0 blacklisted ram0 blacklisted ram10 blacklisted ram11 blacklisted ram12 blacklisted ram13 blacklisted ram14 blacklisted ram15 blacklisted ram1 blacklisted ram2 blacklisted ram3 blacklisted ram4 blacklisted ram5 blacklisted ram6 blacklisted ram7 blacklisted ram8 blacklisted ram9 blacklisted ===== path info sda (mask 0x1f) ===== bus = 1 dev_t = 8:0 size = 25165824 vendor = IBM product = 2145 rev = 0000 h:b:t:l = 1:0:0:0 tgt_node_name = 0x50050768010010b9 serial = 020060402172XX00 path checker = tur (controler setting) state = 2 getprio = /sbin/mpath_prio_alua /dev/%n (controler
setting) prio = 50 uid = 36005076801810085c800000000000194 (cache) ===== path info sdb (mask 0x1f) ===== bus = 1 dev_t = 8:16 size = 104857600 vendor = IBM product = 2145 rev = 0000 h:b:t:l = 1:0:0:1 tgt_node_name = 0x50050768010010b9 serial = 020060402172XX00 path checker = tur (controler setting) state = 2 getprio = /sbin/mpath_prio_alua /dev/%n (controler
setting) prio = 10 uid = 36005076801810085c8000000000001a2 (cache) ===== path info sdc (mask 0x1f) ===== bus = 1 dev_t = 8:32 size = 25165824 vendor = IBM product = 2145 rev = 0000 h:b:t:l = 1:0:1:0 tgt_node_name = 0x5005076801001082 serial = 020060402172XX00 path checker = tur (controler setting) state = 2 getprio = /sbin/mpath_prio_alua /dev/%n (controler
setting) prio = 10 uid = 36005076801810085c800000000000194 (cache) ===== path info sdd (mask 0x1f) ===== bus = 1 dev_t = 8:48 size = 104857600 vendor = IBM product = 2145 rev = 0000 h:b:t:l = 1:0:1:1 tgt_node_name = 0x5005076801001082 serial = 020060402172XX00 path checker = tur (controler setting) state = 2 getprio = /sbin/mpath_prio_alua /dev/%n (controler
setting) prio = 50 uid = 36005076801810085c8000000000001a2 (cache) # # all paths : # 36005076801810085c800000000000194 1:0:0:0 sda 8:0
50 [ready] IBM /2145 36005076801810085c8000000000001a2 1:0:0:1 sdb 8:16
10 [active][ready] IBM 36005076801810085c800000000000194 1:0:1:0 sdc 8:32
10 [ready] IBM /2145 36005076801810085c8000000000001a2 1:0:1:1 sdd 8:48
50 [active][ready] IBM params = 1 queue_if_no_path 0 2 1 round-robin 0 1 1
8:48 1000 round-robin 0 1 1 8:16 1000 status = 1 0 0 2 1 A 0 1 0 8:48 A 0 E 0 1 0 8:16 A 0 Found matching wwid
[36005076801810085c800000000000194] in bindings file. Setting alias to mpath0 pgpolicy = group_by_prio (controler setting) selector = round-robin 0 (internal default) features = 1 queue_if_no_path (controler setting) hwhandler = 0 (controler setting) rr_weight = 1 (internal default) rr_min_io = 1000 (config file default) no_path_retry = NONE (internal default) pg_timeout = NONE (internal default) 0 25165824 multipath 1 queue_if_no_path 0 2 1
round-robin 0 1 1 8:0 1000 round-robin 0 1 1 8:32 1000 set ACT_CREATE: map does not exists Found matching wwid [36005076801810085c8000000000001a2]
in bindings file. Setting alias to mpath1 pgpolicy = group_by_prio (controler setting) selector = round-robin 0 (internal default) features = 1 queue_if_no_path (controler setting) hwhandler = 0 (controler setting) rr_weight = 1 (internal default) rr_min_io = 1000 (config file default) no_path_retry = NONE (internal default) pg_timeout = NONE (internal default) 0 104857600 multipath 1 queue_if_no_path 0 2 1
round-robin 0 1 1 8:48 1000 round-robin 0 1 1 8:16 1000 set ACT_NOTHING: map unchanged [root@svwdcvispay01 etc]# And notice that no /dev/mapper/mpath0 device special files
were created: [root@svwdcvispay01 etc]# ls -la /dev/mapper total 0 drwxr-xr-x 2 root root 160 Jan 29 09:53 . drwxr-xr-x 9 root root 4900 Jan 29 09:51 .. crw------- 1 root root 10, 63 Jan 21 16:15 control brw-rw---- 1 root disk 253, 0 Jan 21 16:15 mpath1 brw-rw---- 1 root disk 253, 1 Jan 21 16:15
mpath1p1 brw-rw---- 1 root disk 253, 2 Jan 21 16:15
mpath1p2 brw-rw---- 1 root disk 253, 3 Jan 21 16:15
mpath1p3 brw-rw---- 1 root disk 253, 4 Jan 21 16:15
mpath1p5 [root@svwdcvispay01 etc]# My /etc/multipath.conf file is basic but I have tried creating an alias entry that looks like “multipaths {multipath {wwid 36005076801810085c800000000000194 alias os}}” for the first LUN but the results are the same, it still won’t create any device special files for the first LUN. [root@svwdcvispay01 mapper]# cat /etc/multipath.conf
| grep -v "#" defaults { user_friendly_names yes } [root@svwdcvispay01 mapper]# I have been working this issue for over a week with IBM
and RedHat tech support and they have been unhelpful. I need to get this
functional because the server in question has been unstable using a single path
to the SAN due to stability issues we have had periodically with one of the SAN
Volume Controllers. If additional information is needed to troubleshoot this
please let me know. Joe little |
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