Quick question regarding windows write cache vs primocache L1 defer write
Posted: Sun Dec 25, 2022 3:04 am
As far as I know, Windows default enables "Write-Caching policy" with "Enable write caching on the device".
I also believe there are two types of "write caching" for Windows(correct me if i am wrong):
1. "write back caching", seems to function similar to primocache's L1 deferred write. The write request go to RAM and is being flushed to target disk at a delayed time while marking the file write request as "complete".
2. "write through caching", which write into RAM but does NOT mark the write request as complete until all data from RAM is properly flushed to target disk.
It would be nice if someone can provide me a detailed article explaining how window's own "write caching" works, quick google didn't yield anything.
My question is, since windows has this cache enabled by default, How is primocache's L1 Deferred write different from Windows' write caching mechnism besides custom set timer delay? And if anyone knows please let me know which method "1 or 2" is used by windows write caching?
Also I would like to confirm if primocache's defer write is "write back caching", which marks the write request as complete.
Lastly, from a data integrity vs performance stand point, how does "write back" compared to "write through"? Thanks.
Also it seems like the time on the forum is dec 25th, so merry xmas!
I also believe there are two types of "write caching" for Windows(correct me if i am wrong):
1. "write back caching", seems to function similar to primocache's L1 deferred write. The write request go to RAM and is being flushed to target disk at a delayed time while marking the file write request as "complete".
2. "write through caching", which write into RAM but does NOT mark the write request as complete until all data from RAM is properly flushed to target disk.
It would be nice if someone can provide me a detailed article explaining how window's own "write caching" works, quick google didn't yield anything.
My question is, since windows has this cache enabled by default, How is primocache's L1 Deferred write different from Windows' write caching mechnism besides custom set timer delay? And if anyone knows please let me know which method "1 or 2" is used by windows write caching?
Also I would like to confirm if primocache's defer write is "write back caching", which marks the write request as complete.
Lastly, from a data integrity vs performance stand point, how does "write back" compared to "write through"? Thanks.
Also it seems like the time on the forum is dec 25th, so merry xmas!