How to add newly added to multipath

jsaravana87 · 01-31-2015, 09:20 PM

Hi ,

I have scanned & find newly attached disk.Need help how to added newly attached disk to multipath configuration .To extend the Volume Group size .Whether i can perform below mentioned command

vgextend Tomcat /dev/sdaw.Kindly advise how to addded disk to multipath

Quote:

[root@mylinz1 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@mylinz1 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@mylinz1 ~]# echo "- - -" > /sys/class/scsi_host/host2/scan

Quote:

[root@mylinz1 ~]# ls -ltr /dev/sd*
brw-r----- 1 root disk 67, 16 Jan 31 21:33 /dev/sdax
brw-r----- 1 root disk 67, 0 Jan 31 21:33 /dev/sdaw

Quote:

[root@mylinz1 ~]# fdisk -l |egrep '^Disk' |egrep -v 'dm-'
Disk /dev/sdaw: 78.6 GB, 73295462400 bytes
Disk /dev/sdax: 78.6 GB, 73295462400 bytes
[root@mylinz1 ~]#

Quote:

[root@mylinz1 ~]# fdisk -l
Disk /dev/sdaw: 78.6 GB, 73295462400 bytes
255 heads, 63 sectors/track, 8910 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdaw doesn't contain a valid partition table

Disk /dev/sdax: 78.6 GB, 73295462400 bytes
255 heads, 63 sectors/track, 8910 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Quote:

[root@mylinz1 ~]# multipath -ll
mpath2 (360060e801603b100000103b10000228c) dm-1 HITACHI,OPEN-V
[size=34G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:3 sdd 8:48 [active][ready]
\_ 1:0:1:3 sdp 8:240 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:3 sdab 65:176 [active][ready]
\_ 4:0:1:3 sdan 66:112 [active][ready]
mpath1 (360060e801603b100000103b10000228b) dm-0 HITACHI,OPEN-V
[size=34G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:2 sdaa 65:160 [active][ready]
\_ 4:0:1:2 sdam 66:96 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:2 sdc 8:32 [active][ready]
\_ 1:0:1:2 sdo 8:224 [active][ready]
mpath9 (360060e801603b100000103b1000022ad) dm-8 HITACHI,OPEN-V
[size=68G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:10 sdai 66:32 [active][ready]
\_ 4:0:1:10 sdau 66:224 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:10 sdk 8:160 [active][ready]
\_ 1:0:1:10 sdw 65:96 [active][ready]
mpath8 (360060e801603b100000103b1000022ac) dm-7 HITACHI,OPEN-V
[size=68G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:9 sdj 8:144 [active][ready]
\_ 1:0:1:9 sdv 65:80 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:9 sdah 66:16 [active][ready]
\_ 4:0:1:9 sdat 66:208 [active][ready]
mpath7 (360060e801603b100000103b1000022ab) dm-6 HITACHI,OPEN-V
[size=68G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:8 sdag 66:0 [active][ready]
\_ 4:0:1:8 sdas 66:192 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:8 sdi 8:128 [active][ready]
\_ 1:0:1:8 sdu 65:64 [active][ready]
mpath6 (360060e801603b100000103b1000022aa) dm-5 HITACHI,OPEN-V
[size=68G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:7 sdh 8:112 [active][ready]
\_ 1:0:1:7 sdt 65:48 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:7 sdaf 65:240 [active][ready]
\_ 4:0:1:7 sdar 66:176 [active][ready]
mpath12 (360060e801603b100000103b10000228a) dm-11 HITACHI,OPEN-V
[size=34G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:1 sdb 8:16 [active][ready]
\_ 1:0:1:1 sdn 8:208 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:1:1 sdal 66:80 [active][ready]
\_ 4:0:0:1 sdz 65:144 [active][ready]
mpath5 (360060e801603b100000103b1000022a9) dm-4 HITACHI,OPEN-V
[size=68G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:6 sdae 65:224 [active][ready]
\_ 4:0:1:6 sdaq 66:160 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:6 sdg 8:96 [active][ready]
\_ 1:0:1:6 sds 65:32 [active][ready]
mpath11 (360060e801603b100000103b100002289) dm-10 HITACHI,OPEN-V
[size=34G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 4:0:1:0 sdak 66:64 [active][ready]
\_ 4:0:0:0 sdy 65:128 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:0 sda 8:0 [active][ready]
\_ 1:0:1:0 sdm 8:192 [active][ready]
mpath4 (360060e801603b100000103b10000228e) dm-3 HITACHI,OPEN-V
[size=34G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:5 sdf 8:80 [active][ready]
\_ 1:0:1:5 sdr 65:16 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:5 sdad 65:208 [active][ready]
\_ 4:0:1:5 sdap 66:144 [active][ready]
mpath10 (360060e801603b100000103b1000022ae) dm-9 HITACHI,OPEN-V
[size=68G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:11 sdl 8:176 [active][ready]
\_ 1:0:1:11 sdx 65:112 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:11 sdaj 66:48 [active][ready]
\_ 4:0:1:11 sdav 66:240 [active][ready]
mpath3 (360060e801603b100000103b10000228d) dm-2 HITACHI,OPEN-V
[size=34G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:4 sdac 65:192 [active][ready]
\_ 4:0:1:4 sdao 66:128 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:4 sde 8:64 [active][ready]
\_ 1:0:1:4 sdq 65:0 [active][ready]
[root@mylinz1 ~]#

Quote:

[root@mylinz1~]# vgs
VG #PV #LV #SN Attr VSize VFree
Tomcat 4 2 0 wz--n- 339.03G 2.03G

dijetlo · 02-03-2015, 06:26 AM

could you post your /etc/multipath.conf.
You'll also need a WWID for the hba or bonded interface
And you'll want to run a modprobe for DM-Multipath to make sure the kernel is on board with this.
Other than that, if you have everything set up correctly, the command to start it is something like

Quote:

service multipathd start
mulitpath -v2

As always, check manual for details

hmec · 02-03-2015, 04:57 PM

Just try and run multipath -r

It will reload all multipath-related info (the "-r" option will force multipath to reload the device maps). I just did it, a few hours ago, on a production server and it worked like a charm.

Best of luck,

Hugo

robertjinx · 02-05-2015, 03:21 AM

Try to use 'rescan-scsi-bus.sh -a' and then if possible 'multipath -F; multipath -v3'. Attach the output, if it doesnt work. Also, could be that those 2-3 disks are not multpathable (if that makes sense).