I recently replaced an 8x 1TB vdev with 8x 8TB. The dataset assigned to this vdev was instantiated with 128k record sizes, but I changed it before replacing the drives to 1M. When using the TrueNAS Raid Calculator online, my 8x 8TB with a record size of 1M should give me 2 extra TiB than I currently…

[image] zmweske: the GUI only shows an estimate of total capacity based on the default 128KiB record size? I’m not sure how the GUI and/or ZFS estimates come up with this number for a pool comprised of RAIDZ vdevs. You have to remember: A pool can be comprised of a mixture of different vdevs…

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Pool replace/expand and Record Size Change with Decreased Capacity

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winnielinnie July 9, 2024, 9:23pm 7

Correct.

I try to demystify it here.

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