12-18-2007 09:50 AM
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01-02-2008 01:29 AM
01-02-2008 01:36 AM
01-04-2008 10:16 AM
Disk space used by vault stores
When an item is archived, it is first compressed and then metadata is added to it. As a general rule, the item is compressed to half its original size, and the metadata comprises approximately 5 KB. When an item is shared, only the metadata is added.
The following gives some general rules for estimating the amount of storage needed:
1. Halve the total size of items to be archived.
2. Divide by the average number of sharers (typically between 1.2 and 1.5).
3. Add 5 KB multiplied by the total number of items.
The compression ratio may vary considerably. Office documents tend to compress very well. Other document types, such as ZIP and JPEG files, are already compressed and cannot be compressed further. The rule is therefore to overestimate the amount of storage that you need. You must also factor in growth in the number of mailboxes and number and size of messages. Because of these extra factors, a more conservative method of estimating storage is to assume that space used by archiving equals the space used by Exchange in storing items.
Hope this helps!
01-07-2008 03:09 AM