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There are four basic types of high-availability middleware that can reduce downtime in
the event of a data path or host failure. The Lightning 9900 V Series supports each
classification of middleware:
A l t e rnate Pathing Middleware Switches the I/O Load in the Event of
Path Failure
This type of middleware automatically switches the I/O load on a failed primary
path to an alternate path on the same host system. The Lightning 9900 V Series
systems support alternate pathing for IBM AIX
®
, HP
®
True64
™
UNIX
®
,
HP-UX
®
and through PVlink, Microsoft
®
Windows NT
®
/Windows
®
2000, Sun
™
Solaris
™,
and IBM DYNIX/ptx
®
.
Hitachi Dynamic Link Manager
™
S o f t w a r e Provides Path Failover and
Load Balancing
Hitachi Dynamic Link Manager
™
software is a family of Hitachi-provided
middleware software utilities that are server-based, as shown in Figure 22.
Dynamic Link Manager software enhances the availability of RAID systems by
providing automatic-error recovery and path failover from server-to-RAID
connection failures. Dynamic Link Manager software provides load balancing in
addition to path failover by re-directing I/O activity to the least busy path using
complex algorithms.
Just because a system is RAID-protected doesn’t mean it is protected against
connection bus failures, which is why Dynamic Link Manager software is required
for true nonstop operations. This product allows systems administrators to take
advantage of the multiple paths on a Lightning 9900 V Series system by adding
redundant connections between application servers and RAID systems. Dynamic
Link Manager software therefore provides increased reliability and performance.
Supported platforms include IBM AIX, Sun Solaris, Windows NT,
Windows 2000, and LINUX
®
(July 2003).
Host Failover
Host failover software supports a cluster of host processors in which one of the
hosts automatically takes over the workload of any failed host in the cluster. This
“takeover” includes the reassignment of networks and peripherals, as well as the
restarting of applications. Host clustering can also be used to create fault-tolerant
workloads and scale processor capabilities while sharing network and disk
resources.
Lightning 9900 V Series systems supports all major open systems clustering
schemes including: HP TruCluster
™
, HP MC/ServiceGuard
™
, HP MC/Lock
Manager, IBM RS6000
®
and SP HACMP
™
, Windows NT/Windows 2000,
Microsoft Cluster Server, NCR UNIX SVR4 Lifekeeper, IBM DYNIX/ptx ATAP,
VERITAS Cluster Server
™
for Sun Solaris and Red Hat
®
Advanced Server 2.1
and SuSE Enterprise Server 7.0 for LINUX
®
.
Alternate pathing
automatically switches
the I/O load on a failed
primary path.
27
Hitachi Freedom Storage Lightning 9900 V Series Availability is Highest in the Industry
One of the hosts
automatically takes
over the workload of any
failed host in the cluster.
Dynamic Link Manager
software provides load
balancing in addition to
path failover.