Scenario: A
P4000 Multi-Site SAN is initially set up as a Multi-Site Cluster
across one iSCSI subnet, for a Campus SAN high availability scenario
across a distance of not more than 250 metres. Subsequently, it is
decided to move one half of the Multi-Site Cluster to a DR site 12km
away, and re-IP the DR site storage systems.
Lab Setup:
SITE01
Cluster VIP on
10.10.1.50
VSA01 on 10.10.1.101
VSA02 on 10.10.1.102
WIN7MACHINE on
10.10.1.1 (with access to a Network RAID-10 volume to test data
connectivity is not interrupted at any stage.)
SITE02
VSA03 on 10.10.1.103
VSA04 on 10.10.1.104
SITE03
FOM on 10.10.3.101
Brief Step-by-Step
Walkthrough:
1. Establish a
second subnet for SITE02 (here using 10.10.2.0/24 ) with IP
connectivity to the SITE01 subnet (which is 10.10.1.0/24 here,) and
SITE03 subnet (used by the Failover Manager on 10.10.3.0/24.)
2. Re-IP the
storage systems in SITE02 (here using 10.10.2.101 and 10.10.2.102) in
turn using the P4000 CMC.
2.1 Edit the
TCP/IP Configuration.
2.2 Accept OK
twice to change the storage system's IP address.
2.3 Click Cancel
twice to the 'Search Network' and 'Network Search Failed' prompts.
2.4 Change the
Storage System's network connection to place it on SITE02's subnet
(either re-patch or change switch port VLAN assignments.)
2.5 Close and
reopen the CMC, and in 'Find Systems', update the List of IP
addresses to search for.
2.6 Log back
into the Management Group.
We will ignore the
“VIP error: System is not reachable by any VIP in the cluster”
for now.
And repeat for
additional storage systems.
3. Finally
select the Cluster > iSCSI tab > iSCSI Tasks > 'Add VIP &
Subnet Mask...' > and create a second Virtual IP Address on the
SITE02 subnet.
4. Then all that
remains (if not done already) is to physically shut down the SITE02
Storage Systems, move them to the DR site, power back up and check
connectivity is all okay.
Note: Network
RAID-10 (2-Way Mirror) volumes on a Multi-Site cluster remain
available even when all storage systems in a site are down or
unavailable. At no stage in this walk-through was access to volumes
interrupted.
Comments
Post a Comment