Date: Wed, 6 Apr 2022 14:56:53 +0200 From: Rainer Duffner <rainer@ultra-secure.de> To: egoitz@ramattack.net Cc: freebsd-fs@freebsd.org, freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org Subject: Re: Desperate with 870 QVO and ZFS Message-ID: <665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de> In-Reply-To: <4e98275152e23141eae40dbe7ba5571f@ramattack.net> References: <4e98275152e23141eae40dbe7ba5571f@ramattack.net>
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--Apple-Mail=_BC042E58-8575-4525-A55E-47AA4EF4E371 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > Am 06.04.2022 um 13:15 schrieb egoitz@ramattack.net: >=20 > I don't really know if, perhaps the QVO technology could be the guilty = here.... because... they say are desktop computers disks... but later. Yeah, they are. Most likely, they don=E2=80=99t have some sort of super-cap. A power-failure might totally toast the filesystem. These disks are - IMO - designed to accelerate read-operations. Their = sustained write-performance is usually mediocre, at best. They might work well for small data-sets - because that is really = written to some cache and the firmware just claims it=E2=80=99s = =E2=80=9Ewritten=E2=80=9C, but once the data-set becomes big enough, = they are about as fast as a fast SATA-disk. https://www.tomshardware.com/reviews/samsung-970-evo-plus-ssd,5608.html --Apple-Mail=_BC042E58-8575-4525-A55E-47AA4EF4E371 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br = class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div = class=3D"">Am 06.04.2022 um 13:15 schrieb <a = href=3D"mailto:egoitz@ramattack.net" = class=3D"">egoitz@ramattack.net</a>:</div><br = class=3D"Apple-interchange-newline"><div class=3D""><span = style=3D"caret-color: rgb(0, 0, 0); font-family: Verdana, Geneva, = sans-serif; font-size: 13.333333015441895px; font-style: normal; = font-variant-caps: normal; font-weight: 400; letter-spacing: normal; = text-align: start; text-indent: 0px; text-transform: none; white-space: = normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; = text-decoration: none; float: none; display: inline !important;" = class=3D"">I don't really know if, perhaps the QVO technology could be = the guilty here.... because... they say are desktop computers disks... = but later.</span></div></blockquote></div><br class=3D""><div = class=3D""><br class=3D""></div><div class=3D"">Yeah, they = are.</div><div class=3D""><br class=3D""></div><div class=3D"">Most = likely, they don=E2=80=99t have some sort of super-cap.</div><div = class=3D""><br class=3D""></div><div class=3D"">A power-failure might = totally toast the filesystem.</div><div class=3D""><br = class=3D""></div><div class=3D"">These disks are - IMO - designed = to accelerate read-operations. Their sustained write-performance is = usually mediocre, at best.</div><div class=3D""><br class=3D""></div><div = class=3D"">They might work well for small data-sets - because that is = really written to some cache and the firmware just claims it=E2=80=99s = =E2=80=9Ewritten=E2=80=9C, but once the data-set becomes big enough, = they are about as fast as a fast SATA-disk.</div><div class=3D""><br = class=3D""></div><div class=3D""><a = href=3D"https://www.tomshardware.com/reviews/samsung-970-evo-plus-ssd,5608= .html" = class=3D"">https://www.tomshardware.com/reviews/samsung-970-evo-plus-ssd,5= 608.html</a></div><div class=3D""><br class=3D""></div><div class=3D""><br= class=3D""></div><div class=3D""><br class=3D""></div></body></html>= --Apple-Mail=_BC042E58-8575-4525-A55E-47AA4EF4E371--
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