I’m about to recreate my pool on empty disks, and send/receive the original data across. But before doing that, I’d like to test CPU time for various compression and checksum options on my specific hardware using a temp pool on the empty disks, rather than picking based on hearsay/guesswork. That …

AFAIK it really depends on the data on how much/fast you want to store and read the data. So I can only make assumptions based on my data. I have a dataset for Nextcloud. That data is Word stuff, combined with uncompressable data like dwg and stuff. Shared with normal users, that do normal user thi…

Its surprisingly hard to do benchmarking properly. Too many caches, shortcuts, and other factors. Its a bit like IT security, if I dont really know the subject in depth, Im probably not competent to whip up a guess how to test it, and absolutely shouldn’t rely on “just write data and time it” …

I would break it down into two smaller parts. A: if it turns out that GZIP or ZSTD does not offer a significant compression improvement over LZ4 in a 1MB recordsize (still not sure if you use datasets or zvols) I would argue it is not worth to begin with. B: Dedup makes it way more complicated. If…

The only thing i could think of is [image] TN-Bench -- An OpenSource Community TrueNAS Benchmarking and Testing Utility Resources This is a community resource that is not officially endorsed by, or supported by iXsystems. Instead it is a personal passion projec…

I just did an exercise where I moved each of my datasets from LZ4 to ZSTD and hand tuned the recordsize for each dataset. I changed the default to be 1M from 128K. For datasets of larger files, like for example videos, I made the recordsize 4M. I went so far as having my “software” dataset have su…

[image] sah: For VMs I am running on the system I set it to 64K. To be clear, I did a lot of reading about how this works and then did some quick testing to confirm understanding. This is a little bit off topic, but record size is a max value, not a static value like volblocksize. Setting it …

Sorry. The dataset that I created call VM is set to 64K. The VMs are zvols under that. Adjusting the recordsize for datasets with larger files reduces the number of block which improves performance. There are a number of articles on that. Here are 3. About ZFS recordsize – JRS Systems: …

[image] Sara: Dedup makes it way more complicated. If you don’t are for some strange reasons really dependent on running your 10 times 2TB drives in a mirror that offer you 20TB of total storage to store your 14TB data, you might even be faster with two 20TB drives in a mirror but without the de…

How detailed do you really want to be on the compression stuff? There are tons of published test and the final TLD is that ZSTD is pretty good and you should just use it as the overhead is small and compression helps with other parts of the system, how things are read, written and cached. There is a…

[image] sah: The dataset that I created call VM is set to 64K. The VMs are zvols under that. Adjusting the recordsize for datasets with larger files reduces the number of block which improves performance. There are a number of articles on that. Here are 3. Yeah, but zvols come with the defau…

Benchmarking different compression/checksum algorithms prior to pool creation?

TrueNAS General

LarsR January 15, 2026, 1:55pm 5

The only thing i could think of is

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Benchmarking different compression/checksum algorithms prior to pool creation?

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