Date: Mon, 15 Jan 2024 08:26:57 +0100 From: Gerrit =?UTF-8?B?S8O8aG4=?= <gerrit.kuehn@aei.mpg.de> To: "Patrick M. Hausen" <pmh@hausen.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: noatime on ufs2 Message-ID: <20240115082657.5ca6da26@arc.aei.uni-hannover.de> In-Reply-To: <14AED5F5-CC24-4A04-89A6-F43628CE563F@hausen.com> References: <ZZqmmM-6f606bLJx@int21h> <a5e38bfbabd37084@orthanc.ca> <CAM5tNy4HuHb=GpQXvE4h2NC8_azOwDS3H7wY3UK%2BcE07owPr3A@mail.gmail.com> <4014880.cjyAsbXg9l@ravel> <a5e3a25e0d57d1a9@orthanc.ca> <CANCZdfosFb1xQdRL9rW1icbVAYbspqnKwWR4CO2guVd5LAv4HA@mail.gmail.com> <14AED5F5-CC24-4A04-89A6-F43628CE563F@hausen.com>
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[-- Attachment #1 --]
Am Sun, 14 Jan 2024 19:14:16 +0100
schrieb "Patrick M. Hausen" <pmh@hausen.com>:
> That number at first looks like a serious load on the write endurance
> of your SSD. Then, doing the math it turns out it's absolutely
> ridiculous.
>
> 100 kB/s sums up to 8,640 GB/day (in decimal units). Even the small
> SSDs typically used for embedded devices like firewalls (32 or 64 G
> capacity) have a write endurance in the order of 100 or 200 TBW.
>
> That's more than 10.000 days or roughly 30 years ...
This highly depends on how your written data are distributed on the disk. I
have seen cases of write amplification by orders of magnitude, e.g., when
adding few bytes on many (several 10k) different files.
cu
Gerrit
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