Where to read about the features of data storage systems?

Question

Storage Area Network

There is an article , from there I quote:

Secondly, in many systems, the first write is worse than the next due to all sorts of snapshot mechanisms, thin provision, deduplication, compression, late allocation, sparse placement , etc.

That's just about the last two technologies I want to know in more detail. And not only about them.
Literature, articles?

Answer 1

I won’t say anything about articles, Google will help.
And in the case, "late allocation" is a lazy allocation, when the program writes to the storage system, but writing to disks does not occur immediately (and space is allocated for the data itself), but after reaching a certain threshold in the buffer, either asynchronously, or the data block is whitened only after the end of writing or flushing buffers to media. In different systems, it can be implemented a little differently. Increases the speed of writing, since you do not need to constantly shake the table of occupations of blocks.
And here is the article - https://ru.wikipedia.org/wiki/%D0%9E%D1%82%D0%BB%D...
"sparse placement" - sparse placement, when memory (disk) is actually allocated only for actually recorded data. For example, I created a 1 gig file, and wrote 10 kilos into it, the space will be allocated only for real data blocks. Sometimes there are interesting effects when there is more data than the actual filling of the storage.