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jeremy.green

Landing zone rules

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Add further rules to the landing zone

a. Any files smaller than [landing zone fee space] would get written to the landing zone.

b. If the landing zone reaches a % of [landing zone capacity] then balancing would occur immediately based on balancing rules.

c. If the file is larger than the [landing zone capacity], the landing zone would get bypassed based on balancing rules.

This would allow the landing zone to still improve the performance for small file writes and support slower very large file writes.

 

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On 19/01/2018 at 3:07 AM, jeremy.green said:

Add further rules to the landing zone

a. Any files smaller than [landing zone fee space] would get written to the landing zone.

b. If the landing zone reaches a % of [landing zone capacity] then balancing would occur immediately based on balancing rules.

c. If the file is larger than the [landing zone capacity], the landing zone would get bypassed based on balancing rules.

This would allow the landing zone to still improve the performance for small file writes and support slower very large file writes.

 

First up, some good news... option B is in the works and slated for v3!

Now to the not so good news... Options A and C is not possible because the OS (and by extension DB) does not know the size of a file being written to the pool (there are exceptions to this, but by in large, we cannot know). When an app, for example notepad, writes a file, it first creates the file, then repeatedly write blocks until done, or an error occurs (aka no space left), and at no point does the file system know the final size of the file, until, the file is closed... this is one of the key issues with pooling in general, and why we are implementing "File Spanning" (see - https://www.drivextender.com/) in Drive Xtender.

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