Date: Thu, 7 Apr 2022 12:05:42 +0200
From: Stefan Esser <se@FreeBSD.org>
To: egoitz@ramattack.net
Cc: freebsd-fs@freebsd.org, freebsd-hackers@freebsd.org, freebsd-performance@freebsd.org, Rainer Duffner <rainer@ultra-secure.de>
Subject: Re: {* 05.00 *}Re: Desperate with 870 QVO and ZFS
Message-ID: <4ef109e8-bd7b-1398-2bc9-191e261d5c06@FreeBSD.org>
In-Reply-To: <e4b7252d-525e-1c0f-c22b-e34b96c1ce83@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>
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From: Stefan Esser <se@FreeBSD.org>
To: egoitz@ramattack.net
Cc: freebsd-fs@freebsd.org, freebsd-hackers@freebsd.org,
freebsd-performance@freebsd.org, Rainer Duffner <rainer@ultra-secure.de>
Message-ID: <4ef109e8-bd7b-1398-2bc9-191e261d5c06@FreeBSD.org>
Subject: Re: {* 05.00 *}Re: Desperate with 870 QVO and ZFS
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>
In-Reply-To: <e4b7252d-525e-1c0f-c22b-e34b96c1ce83@FreeBSD.org>
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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 ...
(or rather: strictly avoid them in a non-consumer setting).
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