This is great, but long, so If you're interested in how flashpool works I've selected some start and stop times for the most relevant pieces.1:27
of explanation of how NetApp cache based virtual storage tiering works vs traditional auto-tiering approaches, and why it is superior13:13
- Intro to Flashpool15:28
– Long kind of rambly discussion about flash pool about random overwrite caching18:21
– Good technical explanation of read and write caching in flashpool20:30
– Discussion around how we track the age of the block in the cache for ageing (interesting but technically deep)23:20
More Discussion about interactions with snapshots and checkpointing to hard disk23:48
Example of cost reductions for the same performance24:31
- Discussion on how much cache you can add to a system (numbers are now bigger since ONTAP 8.2.1 was released)25:50
Example of performance improvements for the same expenditure27:05
- Summary of when to use flashpool vs flashcache.
This video was produced a little under a year ago, and things have progressed, and my personal feeling is that for greenfield implementations following best practices for Clustered Data ONTAP from 8.2.1 onwards, the non disruptive addition of additional capacity, plus larger sizes and the falling price of SSD makes flashpool the default choice for Automated Storage Tiering, with FlashCache reserved for special use cases.
If you've got the time, the section that follows on FlashAccel is also good, and is now even better with recent updates to the software.