Reply to post: Re: Real-time data migration is key

How do you identify I/O hotspots and how do you address them?


Re: Real-time data migration is key

"movement needs to occur in as close to real-time as possible"

While in an ideal world this may be true, stressing your storage more at the very moment it's stressed is a poor solution, and is why VMware have not made much progress with storage DRS.

Hot blocks don't need to be moved in real time because a good SAN will copy hot reads immediately to the cache. Hot writes get written directly to the fast tier, so no data need move at all.

Although they are not great at tiering, NetApp have nice explanations of this when discussing their new flash drive hybrid aggregates. It's not tiering, just they explain the data movement nicely.

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