Date: Tue, 6 May 2025 05:04:52 +0000 From: Colin Percival <cperciva@tarsnap.com> To: Charles Sprickman <spork@bway.net>, freebsd-stable@freebsd.org Subject: Re: NVMe (U.2) hot-swap support status? Message-ID: <01000196a3fb8737-9e591147-f4fd-439d-85bc-5f155be4bebb-000000@email.amazonses.com> In-Reply-To: <2E8A7BC6-6C3F-431F-B6F0-2611577B8028@bway.net> References: <2E8A7BC6-6C3F-431F-B6F0-2611577B8028@bway.net>
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On 5/5/25 21:54, Charles Sprickman wrote: > Anyhow, we're trying purchase a few servers (likely this Supermicro: https://www.supermicro.com/en/products/system/UP/1U/SYS-111E-WR) and since manufacturers don't seem to validate for FreeBSD these days, I was hoping for some community input. > > Last time I looked into this NVMe (specifically the "U.2" format for servers that includes hot swap) was supported in FreeBSD but hot swap was kind of iffy. I don't think too many FreeBSD users/developers at that time had the hardware, most people seemed to just be using an on-board NVMe drive on desktop or laptop systems, and there's not any real call for hot swap in that segment. > > I have a thread on the forums linked below, but really what I'm looking to find is some larger orgs that are running NVMe drives and can confirm hot swap works as expected, if there's any gotchas to be on the lookout for, etc. Trying not to overcomplicate it, but we don't want to be stuck with a bunch of servers that might be less stable than our current SAS/SATA servers. We exclusively use ZFS, if that's useful info. I can't speak to *physical* hotplug, but I've put a lot of energy over the past few months into making sure that nvme "hotplug" is 100% functional in Amazon EC2. If you run into problems it's probably going to be due to broken firmware, so unless anyone has experience with that specific server I think the best answer you can get is "it should work but you need to test it and find out". -- Colin Percival FreeBSD Release Engineering Lead & EC2 platform maintainer Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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