Table of Contents
Advertisement
46
NAS Gateway 500 Administrator's Guide
d. For remotely mirrored volumes, enter the file serving IP addresses for
serving the mirrored volumes. These IP addresses must be different from
the file serving addresses for non-mirrored volumes.
e. For remotely mirrored volumes, choose one of the following mirroring
modes:
v Synchronous mirroring: Data is written first at the remote site, and then at
the local site. Further processing is blocked until both writes are
complete.
v Mirror write consistency: Data is written to the local disk concurrently with
the copy to the remote site. This increases the performance of the mirror.
The write request does not return to the application until both the local
and the remote writes are complete.
v Asynchronous mirroring: Data is written at the local site and is queued to
be sent to the remote site. Input can continue at the local site while the
previously entered data is being mirrored.
f. If using Remote Mirroring, you must also choose a remote priority node. The
priority node is used to determine which node of a remote site takes over in
case of a local site failure.
If the local site has two nodes named L1 and L2 and two remote nodes
named R1 and R2, where R2 has been designated the priority node for the
local node L1, then:
If L1 fails, L2 takes over.
Then if L2 fails, R2 takes over.
Then if R2 fails, R1 takes over.
Note: In the event of site failure, refer to Appendix C, "Remote Mirroring
problem determination," on page 295.
Each node at a site has a node at the other site assigned as the remote
priority node; if the other site has only a single node, then that node is the
remote priority node.
g. Use the drop-down menu to select the adapter port for which you want to
assign a boot IP address. These are base IP addresses assigned to the
Ethernet ports to be used in the cluster. Refer to the following guidelines
when configuring the boot IP addresses:
v They are not for direct client access.
v At least two and no more than eight Ethernet ports must be assigned
Boot IP addresses on each node.
v They must not conflict with another IP address on the network.
v They must be on different subnets on a given node.
v They cannot be on the same subnet as any file serving IP addresses
within the same cluster.
After selecting the port to use, enter the IP address and click Add. The new
boot IP address and port are added to the list. Add at least two boot IP
addresses; add no more than eight.
h. Click Next.
Advertisement
Table of Contents
