Date: Wed, 06 Apr 2022 16:36:42 +0200 From: egoitz@ramattack.net To: Rainer Duffner <rainer@ultra-secure.de> Cc: freebsd-fs@freebsd.org, freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org Subject: Re: Re: Desperate with 870 QVO and ZFS Message-ID: <0ef282aee34b441f1991334e2edbcaec@ramattack.net> In-Reply-To: <665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de> References: <4e98275152e23141eae40dbe7ba5571f@ramattack.net> <665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de>
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--=_99711a23deca8e31b3fd04d620ec3dd4 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Hi Rainer! Thank you so much for your help :) :) Well I assume they are in a datacenter and should not be a power outage.... About dataset size... yes... our ones are big... they can be 3-4 TB easily each dataset..... We bought them, because as they are for mailboxes and mailboxes grow and grow.... for having space for hosting them... We knew they had some speed issues, but those speed issues, we thought (as Samsung explains in the QVO site) they started after exceeding the speeding buffer this disks have. We though that meanwhile you didn't exceed it's capacity (the capacity of the speeding buffer) no speed problem arises. Perhaps we were wrong?. Best regards, El 2022-04-06 14:56, Rainer Duffner escribió: >> Am 06.04.2022 um 13:15 schrieb egoitz@ramattack.net: >> 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't 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's „written", 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 --=_99711a23deca8e31b3fd04d620ec3dd4 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'font-size: 10pt; font-family: Verdana,Gen= eva,sans-serif'> <p>Hi Rainer!</p> <p><br /></p> <p>Thank you so much for your help :) :)</p> <p>Well I assume they are in a datacenter and should not be a power outage= =2E...</p> <p>About dataset size... yes... our ones are big... they can be 3-4 TB easi= ly each dataset.....</p> <p>We bought them, because as they are for mailboxes and mailboxes grow and= grow.... for having space for hosting them...</p> <p>We knew they had some speed issues, but those speed issues, we thought (= as Samsung explains in the QVO site) they started after exceeding the speed= ing buffer this disks have. We though that meanwhile you didn't exceed it's= capacity (the capacity of the speeding buffer) no speed problem arises. Pe= rhaps we were wrong?.</p> <p><br /></p> <p>Best regards,</p> <p><br /></p> <p><br /></p> <p>El 2022-04-06 14:56, Rainer Duffner escribió:</p> <blockquote type=3D"cite" style=3D"padding: 0 0.4em; border-left: #1010ff 2= px solid; margin: 0"><!-- html ignored --><br /> <div><br /> <blockquote type=3D"cite" style=3D"padding: 0 0.4em; border-left: #1010ff 2= px solid; margin: 0"> <div>Am 06.04.2022 um 13:15 schrieb <a href=3D"mailto:egoitz@ramattack.net"= >egoitz@ramattack.net</a>:</div> <br class=3D"Apple-interchange-newline" /> <div><span style=3D"caret-color: #000000; font-family: Verdana, Geneva, san= s-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; di= splay: inline !important;">I don't really know if, perhaps the QVO technolo= gy could be the guilty here.... because... they say are desktop computers d= isks... but later.</span></div> </blockquote> </div> <br /> <div> </div> <div>Yeah, they are.</div> <div> </div> <div>Most likely, they don't have some sort of super-cap.</div> <div> </div> <div>A power-failure might totally toast the filesystem.</div> <div> </div> <div>These disks are - IMO - designed to accelerate read-operations= =2E Their sustained write-performance is usually mediocre, at best.</div> <div> </div> <div>They might work well for small data-sets - because that is really writ= ten to some cache and the firmware just claims it's „written", but on= ce the data-set becomes big enough, they are about as fast as a fast SATA-d= isk.</div> <div> </div> <div><a href=3D"https://www.tomshardware.com/reviews/samsung-970-evo-plus-s= sd,5608.html" target=3D"_blank" rel=3D"noopener noreferrer">https://www.tom= shardware.com/reviews/samsung-970-evo-plus-ssd,5608.html</a></div> <div> </div> <div> </div> <div> </div> </blockquote> </body></html> --=_99711a23deca8e31b3fd04d620ec3dd4--
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