Date: Mon, 4 Mar 2024 09:17:09 -0500 (EST) From: Daniel Feenberg <feenberg@nber.org> To: Andrea Venturoli <ml@netfence.it> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS ARC memory requirements Message-ID: <83a5e3e2-a211-c524-1c8f-700802d148f@nber.org> In-Reply-To: <7f7a9f1f-8a2b-41ef-a6a7-1dc1e2f160af@netfence.it> References: <7f7a9f1f-8a2b-41ef-a6a7-1dc1e2f160af@netfence.it>
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On Mon, 4 Mar 2024, Andrea Venturoli wrote: > > I read the rule of thumbs for RAM is 1GB per TB of storage, which would > possibly mean 192GiB!!!, but I also read this is argued upon. We have a number of large ZFS stores used for both production and backup. Most have 64GB and that seems more than enough. We use compression, but do not do de-duplication. I believe the advice you have read accounts for de-duplication, which is memory-intensive. Daniel Feenberg
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