Jul 10, 2015 · Since ZFS utilizes algorithms to track frequently used data in addition to recently used data, your cache devices will still provide performance improvements after a backup. …

Mar 24, 2022 · ARC/ZIL are terms used to describe ZFS’s ram cache. ARC is a read cache, much like the regular Unix caching mechanism, but where Unix typically uses a LRU algorithm, …

Feb 18, 2025 · One is Adaptive Replacement Cache (ARC), which uses the server memory (RAM). The other is second level adaptive replacement cache (L2ARC), which uses cache …

Mar 4, 2016 · To improve read performance, ZFS utilizes system memory as an Adaptive Replacement Cache (ARC), which stores your file system’s most frequently and recently used …

Aug 25, 2021 · The way ZFS works: There is a read cache, ARC, in RAM. It can be increased in size with L2ARC in SSD, but get the ARC stats before you do: If your working set fits into …

Apr 16, 2023 · ZFS has no “real” write caching like one usually imagines a write cache. But first we have to talk about two kinds of writes: All ZFS filesystems have a write cache. Every ZFS …

Aug 21, 2023 · It works great with my dual NVME cache pool. From what I've read, compression actually improves read & write speed. I'm guessing since it's using your CPU for that and well, …

Sep 11, 2021 · zfs_arc_max; zfs_arc_sys_free; By default, TrueNAS has zfs_arc_max as 0, which defaults to 50%. zfs_arc_sys_free is interesting because it tells zfs to keep at least this …

Jun 27, 2023 · Just a correction, ZFS does not use memory (ram) as “traditional” write-back cache. This would create a risk for data integrity if a system lost power. Edit: Yes, ZFS …

May 5, 2020 · I have a question regarding zfs cache. It's nearly consuming 40Gb of RAM and bringing the system to a crawl. I wasn't aware ZFS cache consumed this much memory. Is …