3 ms·
I should point out that the SLOG only caches synchronous writes, which are written twice with ZFS. Also, the L2ARC is great, but does still have RAM overhead.
by aidenn0 2y ago
I should point out that the SLOG only caches synchronous writes, which are written twice with ZFS.
Also, the L2ARC is great, but does still have RAM overhead. There are also useful tunables. I had a workload on a RAM limited machine where directory walking was common, but data reads were fairly random and a L2ARC configured for metadata only speed it up by a large amount.
- kaliszad 2y agoYou can also have a special metadata only/ small files dedicated special VDEV. ZFS can pull of many tricks if you configure it well. Of course, the L2ARC is better, if you don't trust the caching device that much (e.g. only have a single SSD).
- flemhans 2y agoYou can also configure an L2ARC to only hold metadata, which is safer than a metadata device.