Date: Tue, 25 Feb 2020 10:11:23 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: Running FreeBSD on M.2 SSD Message-ID: <6e329bb8-b96e-fa16-cc73-426685593943@denninger.net> In-Reply-To: <20200225145346.GA42880@phouka1.phouka.net> References: <CAP4Gn9DFAoQtq6NP4hZ-Jq=ddnhp7Bzc_X%2BSce2FPVWn6kjASg@mail.gmail.com> <202002250115.01P1F9KX090465@mail.karels.net> <CAP4Gn9CqCSk5Lof_-05j1S0EWmTdB_HRfOe5zVig5khf7wJ0ow@mail.gmail.com> <188F34DA-192C-4D44-96B5-18A7DAE8EC67@digsys.bg> <6028c786-8610-01d9-818e-6f69a2fe9645@ingresso.co.uk> <20200225145346.GA42880@phouka1.phouka.net>
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This is a cryptographically signed message in MIME format. --------------ms010102090901010103080904 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2/25/2020 9:53 AM, John Kennedy wrote: > On Tue, Feb 25, 2020 at 11:07:48AM +0000, Pete French wrote: >> I have often wondered if ZFS is more aggressive with discs, because un= til >> very recently any solid state drive I have used ZFS on broke very quic= ky. ... > I've always wondered if ZFS (and other snapshotting file systems) wo= uld help > kill SSD disks by locking up blocks longer than other filesystems might= =2E For > example, I've got snapshot-backups going back, say, a year then those b= locks > that haven't changed aren't going back into the pool to be rewritten (a= nd > perhaps favored because of low write-cycle count). As the disk fills u= p, the > blocks that aren't locked up get reused more and more, leading to extra= wear > on them. Eventually one of those will get to the point of erroring out= =2E > > Personally, I just size generously but that isn't always an option f= or > everybody. I have a ZFS RaidZ2 on SSDs that has been running for several /years=20 /without any problems.=C2=A0 The drives are Intel 730s, which Intel CLAIM= S=20 don't have power-loss protection but in fact appear to; not only do they = have caps in them but in addition they pass a "pull the cord out of the=20 wall and then check to see if the data is corrupted on restart" test on=20 a repeated basis, which I did several times before trusting them. BTW essentially all non-data-center SSDs fail that test and some fail it = spectacularly (destroying the OS due to some of the in-flight data being = comingled on an allocated block with something important; if the=20 read/erase/write cycle interrupts you're cooked as the "other" data that = was not being modified gets destroyed too!) -- the Intels are one of the = very, very few that have passed it. --=20 -- Karl Denninger /The Market-Ticker/ S/MIME Email accepted and preferred --------------ms010102090901010103080904 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw 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