From nobody Thu Apr 07 10:05:42 2022 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 6937A1A9104B; Thu, 7 Apr 2022 10:05:46 +0000 (UTC) (envelope-from se@FreeBSD.org) Received: from smtp.freebsd.org (smtp.freebsd.org [96.47.72.83]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4KYxpf1mgPz4VgL; Thu, 7 Apr 2022 10:05:46 +0000 (UTC) (envelope-from se@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1649325946; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; 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Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: {* 05.00 *}Re: Desperate with 870 QVO and ZFS Content-Language: en-US From: Stefan Esser To: egoitz@ramattack.net Cc: freebsd-fs@freebsd.org, freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org, Rainer Duffner References: <4e98275152e23141eae40dbe7ba5571f@ramattack.net> <665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de> <0ef282aee34b441f1991334e2edbcaec@ramattack.net> In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------R8ub0be6TPBsoV0UvSwjPqsv" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1649325946; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=5VyYb2yVup9mr10ClzHwP1P7qCT1D6ac9qjMWMQpYPk=; b=RWVkDqf8CQrXjJevQVFL0cShsK6iSZaO1jgE2Bi17Mnlp9ugcTH7ulNWb7xwGAtQUp37P7 w3iX6N9imCTlq1qr1VW74CVMGcRRhHJMty/o6myH3BBue0yalPYyhPeo8tZPooYkkYXV92 TMnvXkls2R8OOcsMCvywiIn1ZKIihEhBaZn1db4MLOUe05VMrCvPXgyBsgE6hrtxLVcJzL jK0v5ylRXmKuP9f2iFcfPVYjbyReNcRsCRifFXziero9bJLodjprmIBgBGhRe0KrQqckia cJgbD/ILyDZGJFRbK9NP8Je+Yy5abeS1DhYGSR8qPgD361vy44hLJEqC8qSOWQ== ARC-Seal: i=1; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable Am 06.04.22 um 23:49 schrieb Stefan Esser: > Am 06.04.22 um 18:34 schrieb egoitz@ramattack.net: >=20 >>> The 870 QVO is specified for 370 full capacity >>> writes, i.e. 370 TB for the 1 TB model. That's still a few hundred >>> GB a day - but only if the write amplification stays in a reasonable >>> range ... >>> =C2=A0 >>> *Well yes... 2880TB in our case....not bad.. isn't it?* >=20 > I assume that 2880 TB is your total storage capacity? That's not too ba= d, in > fact. ;-) I just noticed that this is not the extreme total size of a ZFS pool (should have noticed this while answering late at night ...) And no, a specified life-time of 2880 TB written is not much, it is at the absolute lower end of currently available SSDs at 360 TB per 1 TB of capacity. This is equivalent to 360 total capacity writes, but given the high amount of write amplification that can be assumed to occur in your use case, I'd heavily over-provision a system with such SSDs ... 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