System News for Sun Users - The Blog

A Primer by Joerg Moellenkamp

Seeking to address some misconceptions on the subject of deduplication, Joerg Moellenkamp’s blog “To dedup or not to dedup - that results in a lot of questions” provides a primer on the process. There are two major ways to deduplicate, he writes: synchronous and asynchronous. The synchronous variant does the deduplication while writing to the disks, so duplicates aren’t written to disk; the asynchronous variant writes every block to the disk and later on it deletes duplicated blocks by searching possible candidates.

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The Challenges of a SAN Between Servers and Storage

Joerg Moellenkamp does the math to demonstrate that latency does indeed matter when there is SAN between your server and your storage. He pits a direct-connected storage-server configuration that uses a 10 meter long cable against a second configuration that uses a director or a switch and two five meter cables.

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