Administrator Guide

Live Volume with Linux/UNIX
94 Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064
A volume (or multiple volumes) is first created and mapped to a Linux host. The volumes are scanned,
identified and brought into multipath awareness as shown in the following example.
[root@tssrv216 ~]# multipath -ll
vol_02 (36000d31000fba6000000000000000015) dm-4 COMPELNT,Compellent Vol
size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 0:0:0:2 sdd 8:48 active ready running
|- 1:0:0:2 sde 8:64 active ready running
|- 0:0:2:2 sdh 8:112 active ready running
|- 1:0:2:2 sdi 8:128 active ready running
vol_01 (36000d31000fba6000000000000000014) dm-5 COMPELNT,Compellent Vol
size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 0:0:7:1 sdj 8:144 active ready running
|- 1:0:10:1 sdk 8:160 active ready running
|- 0:0:9:1 sdl 8:176 active ready running
|- 1:0:12:1 sdm 8:192 active ready running
vol_00 (36000d31000fba6000000000000000013) dm-3 COMPELNT,Compellent Vol
size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 1:0:0:1 sdc 8:32 active ready running
|- 0:0:0:1 sdb 8:16 active ready running
|- 0:0:2:1 sdf 8:80 active ready running
|- 1:0:2:1 sdg 8:96 active ready running
These volumes are then converted into Live Volumes and synchronously (either HA or HC modes) replicated
to the alternate array. The volumes on the alternate array are then mapped back to the same Linux host. The
volumes are once again scanned, identified, and brought into multipath awareness as shown in the following.
Each volume is now represented by four additional paths, these paths are the mappings from the alternate
array.
[root@tssrv216 ~]# multipath -ll
vol_02 (36000d31000fba6000000000000000015) dm-4 COMPELNT,Compellent Vol
size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 0:0:0:2 sdd 8:48 active ready running
|- 1:0:0:2 sde 8:64 active ready running
|- 0:0:2:2 sdh 8:112 active ready running
|- 1:0:2:2 sdi 8:128 active ready running
|- 0:0:5:2 sdo 8:224 active ready running
|- 0:0:8:2 sdq 65:0 active ready running
|- 1:0:4:2 sdu 65:64 active ready running
`- 1:0:8:2 sdw 65:96 active ready running
vol_01 (36000d31000fba6000000000000000014) dm-5 COMPELNT,Compellent Vol
size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 0:0:7:1 sdj 8:144 active ready running
|- 1:0:10:1 sdk 8:160 active ready running
|- 0:0:9:1 sdl 8:176 active ready running