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StorNext File System Tuning
The Metadata Controller System
StorNext File System Tuning Guide 9
used to realize performance gains from increased memory:
BufferCacheSize, InodeCacheSize, and ThreadPoolSize.
However, it is critical that the MDC system have enough physical
memory available to ensure that the FSM process doesn’t get swapped
out. Otherwise, severe performance degradation and system instability
can result.
The operating system on the metadata controller must always be run in
U.S. English.
FSM Configuration File
Settings
The following FSM configuration file settings are explained in greater
detail in the
cvfs_config man page. For a sample FSM configuration file,
see
Sample FSM Configuration File on page 27.
The examples in the following sections are excerpted from the sample
configuration file from
Sample FSM Configuration File on page 27.
Stripe Groups
Splitting apart data, metadata, and journal into separate stripe groups
is usually the most important performance tactic. The
create, remove,
and
allocate (e.g., write) operations are very sensitive to I/O latency of
the journal stripe group. Configuring a separate stripe group for journal
greatly benefits the speed of these operations because disk seek latency
is minimized. However, if
create, remove, and allocate performance
aren't critical, it is okay to share a stripe group for both metadata and
journal, but be sure to set the exclusive property on the stripe group so
it doesn't get allocated for data as well. It is recommended that you
assign only a single LUN for each journal or metadata stripe group.
Multiple metadata stripe groups can be utilized to increase metadata I/
O throughput through concurrency. RAID1 mirroring is optimal for
metadata and journal storage. Utilizing the write-back caching feature
of the RAID system (as described previously) is critical to optimizing
performance of the journal and metadata stripe groups.
Example:
[stripeGroup RegularFiles]
Status UP
Exclusive No ##Non-Exclusive stripeGroup
for all Files##
Read Enabled
Write Enabled