The Plan And Design Workflow; Assessing Business Needs; Copy Frequency - Hitachi AMS2100 User Manual
Ams 2000 family copy-on-write snapshot
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The plan and design workflow
Assessing business needs
Copy frequency
2-2
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
The SnapShot planning effort consists of determining the number of
V-VOLs required by your organization, the V-VOL(s)' lifespan, that is,
how long they must be held before being updated again, the
frequency that snapshots are taken, and the size of the data pool.
This information is found by analyzing business needs and measuring
write workload sent by the host application to the primary volume.
The plan and design workflow consists of the following:
•
Assess business needs.
•
Determine how often a snapshot should be taken.
•
Determine how long the snapshot should be held.
•
Determine the number of snapshot copies required per P-VOL.
•
Measure production system write workload.
•
Size the data pool. (For a description of the data pool, see
pools on page
1-4.
These objectives are addressed in detail in this chapter. Two other
tasks are required before your design can be implemented, which are
also addressed in this chapter:
•
When you have established your SnapShot system design, the
system's maximum allowed capacity must be calculated. This
has to do with how the array manages storage segments.
•
Equally important in the planning process are the ways that
various operating systems interact with SnapShot.
Business needs have to do with how long back-up data needs to be
retained and what the business or organization can tolerate when
disaster strikes.
The following organizational priorities help determine the following:
•
How often a snapshot should be made (frequency)
•
How long a snapshot (the V-VOL) should be held (lifespan)
•
The number of snapshots (V-VOLs) that will be required for the
P-VOL.
How often copies need to be made is determined by how much data
could be lost in a disaster before business is significantly impacted.
To determine how often a snapshot should be taken
Decide how much data could be lost in a disaster without
significant impact to the business.
Planning and design
Data
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