Date: Thu, 07 Apr 2022 15:57:33 +0200
From: egoitz@ramattack.net
To: Stefan Esser <se@freebsd.org>
Cc: freebsd-fs@freebsd.org, freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org, Rainer Duffner <rainer@ultra-secure.de>
Subject: Re: {* 05.00 *}Re: Re: Desperate with 870 QVO and ZFS
Message-ID: <da6d546fd9294c37cf46a5f3e71896f5@ramattack.net>
In-Reply-To: <4ef109e8-bd7b-1398-2bc9-191e261d5c06@FreeBSD.org>
References: <4e98275152e23141eae40dbe7ba5571f@ramattack.net> <665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de> <0ef282aee34b441f1991334e2edbcaec@ramattack.net> <dd9a55ac-053d-7802-169d-04c95c045ed2@FreeBSD.org> <ce51660b5f83f92aa9772d764ae12dff@ramattack.net> <e4b7252d-525e-1c0f-c22b-e34b96c1ce83@FreeBSD.org> <4ef109e8-bd7b-1398-2bc9-191e261d5c06@FreeBSD.org>
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[-- Attachment #1 --] Hi!! Thanks ;) really man :) Answering below in bold blue... El 2022-04-07 12:05, Stefan Esser escribió: > 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. > > YEP THAT'S IT... > > 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 ... > (or rather: strictly avoid them in a non-consumer setting). > > It's slightly late for over-provisioning... you know... we have done the zpool create with the whole disk..not just a slice.... > > WE CAN TRY TO BE SLIGHTLY FAR FROM THE 80% CAPACITY LIMIT BUT.... NOT POSSIBLE NOW... AT LEAST FOR THIS GROUP OF SERVERS... > > CHEERS! [-- Attachment #2 --] <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'> <p>Hi!!</p> <p><br /></p> <p>Thanks ;) really man :)</p> <p><br /></p> <p>Answering below in bold blue...</p> <div> </div> <p><br /></p> <p>El 2022-04-07 12:05, Stefan Esser escribió:</p> <blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0"><!-- html ignored --><!-- head ignored --><!-- meta ignored --> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"><br /><br /> I just noticed that this is not the extreme total size of a ZFS pool<br /> (should have noticed this while answering late at night ...)<br /> <br /> And no, a specified life-time of 2880 TB written is not much, it is<br /> at the absolute lower end of currently available SSDs at 360 TB per<br /> 1 TB of capacity.</div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"> </div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"><strong><span style="color: #0000ff;">Yep that's it...</span></strong><br /> <br /> This is equivalent to 360 total capacity writes, but given the high<br /> amount of write amplification that can be assumed to occur in your<br /> use case, I'd heavily over-provision a system with such SSDs ...<br /> (or rather: strictly avoid them in a non-consumer setting).</div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"> </div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace">It's slightly late for over-provisioning... you know... we have done the zpool create with the whole disk..not just a slice....</div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"> </div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"><strong><span style="color: #0000ff;">We can try to be slightly far from the 80% capacity limit but.... not possible now... at least for this group of servers...</span></strong></div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"> </div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"><strong><span style="color: #0000ff;">Cheers!</span></strong></div> </blockquote> </body></html>
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