Date: Wed, 26 Feb 2020 10:12:27 +1000 From: George Michaelson <ggm@algebras.org> To: Mario Olofo <mario.olofo@gmail.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Running FreeBSD on M.2 SSD Message-ID: <CAKr6gn1naC73FwG%2BMqW6=6UkDoD4y5MoAAZ9LUNtLDPAFZbdmQ@mail.gmail.com> In-Reply-To: <CAP4Gn9A=%2BdDxjMiNm-JqdHCRA=x7SgpHiNdzFm=BaPHoH3ByBg@mail.gmail.com> 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> <6e329bb8-b96e-fa16-cc73-426685593943@denninger.net> <CAP4Gn9D1==FR8S4O3jJbLXwNEYqffL2L_uhK8yHD2xBzJGemqQ@mail.gmail.com> <CAP4Gn9CqNpyz1S8QfDjm0vwhSVmjYMtk5Rt0Q3fZ=P_7nVMSSA@mail.gmail.com> <CAP4Gn9A=%2BdDxjMiNm-JqdHCRA=x7SgpHiNdzFm=BaPHoH3ByBg@mail.gmail.com>
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you said "hybrid HDD" is this possibly about write-back vs write-through cache integrity and some confusion in a driver over what is committed back in disk, and what is not? this feels like a very nasty corner case. Could you be explicit about versions and vendors? I am asking for selfish reasons: I have a lot of dependencies in a large SSD backed ZFS postgres server on Dell, and I am about to commit to a lenovo X1 Carbon 7/8th gen which would be SSD and almost certainly was intended to be ZFS-SSD in FreeBSD. -George On Wed, Feb 26, 2020 at 9:22 AM Mario Olofo <mario.olofo@gmail.com> wrote: > > Hello, > > I reinstalled FreeBSD 12.1 on my SSD (in the swap partition of my Linux t= o > test) and on my Hybrid HDD. > > Just configured rc.conf to start my wifi dongle, downoaded git, node and > npm via pkg and... as you can see in my screenshot, > the ZFS already shows corrupted data... > > Can't been able to load the FreeBSD from the HDD though, don't know why, = if > someone knows how to load the > kernel from the HDD via loader on SSD or grub2, I can try =3D) > > Mario > > Em ter., 25 de fev. de 2020 =C3=A0s 20:18, Mario Olofo <mario.olofo@gmail= .com> > escreveu: > > > Hello, > > > > I reinstalled FreeBSD 12.1 on my SSD (in the swap partition of my Linux= to > > test) and on my Hybrid HDD. > > > > Just configured and rc.conf to start my wifi dongle, downoaded git, nod= e > > and npm via pkg and... as you can see in my screenshot, > > the ZFS already shows corrupted data... > > > > Can't been able to load the FreeBSD from the HDD though, don't know why= , > > if someone direct me how to load the > > kernel from the HDD via loader or grub2, I'll try =3D) > > > > Em ter., 25 de fev. de 2020 =C3=A0s 18:56, Mario Olofo <mario.olofo@gma= il.com> > > escreveu: > > > >> Hello, > >> > >> I reinstalled FreeBSD 12.1 on my SSD (in the swap partition of my Linu= x > >> to test) and on my Hybrid HDD. > >> > >> Just configured and rc.conf to start my wifi dongle, downoaded git, no= de > >> and npm via pkg and... as you can see in my screenshot, > >> the ZFS already shows corrupted data... > >> > >> Can't been able to load the FreeBSD from the HDD though, don't know wh= y, > >> if someone direct me how to load the > >> kernel from the HDD via loader or grub2, I'll try =3D) > >> > >> Mario > >> > >> Em ter., 25 de fev. de 2020 =C3=A0s 12:11, Karl Denninger <karl@dennin= ger.net> > >> escreveu: > >> > >>> > >>> 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, becaus= e > >>> until > >>> >> very recently any solid state drive I have used ZFS on broke very > >>> quicky. ... > >>> > I've always wondered if ZFS (and other snapshotting file systems= ) > >>> would help > >>> > kill SSD disks by locking up blocks longer than other filesystems > >>> might. For > >>> > example, I've got snapshot-backups going back, say, a year then tho= se > >>> blocks > >>> > that haven't changed aren't going back into the pool to be rewritte= n > >>> (and > >>> > perhaps favored because of low write-cycle count). As the disk fil= ls > >>> up, 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. > >>> > > >>> > Personally, I just size generously but that isn't always an opti= on > >>> for > >>> > everybody. > >>> > >>> I have a ZFS RaidZ2 on SSDs that has been running for several /years > >>> /without any problems. The drives are Intel 730s, which Intel CLAIMS > >>> don't have power-loss protection but in fact appear to; not only do t= hey > >>> have caps in them but in addition they pass a "pull the cord out of t= he > >>> wall and then check to see if the data is corrupted on restart" test = on > >>> 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 be= ing > >>> comingled on an allocated block with something important; if the > >>> read/erase/write cycle interrupts you're cooked as the "other" data t= hat > >>> was not being modified gets destroyed too!) -- the Intels are one of = the > >>> very, very few that have passed it. > >>> > >>> -- > >>> -- Karl Denninger > >>> /The Market-Ticker/ > >>> S/MIME Email accepted and preferred > >>> > >> > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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