Re:Why are my ZFS disks so noisy?
by aidenn0 on Friday September 27, 2024 @10:19AM
(#41670822)
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.
Re:Why are my ZFS disks so noisy?
by kaliszad on Friday September 27, 2024 @10:53AM
(#41671223)
You 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).
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.