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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--Sig_/go6ra6EDg2tnbB0iQ8sfauY Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable 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. >=20 > 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. >=20 > 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 --Sig_/go6ra6EDg2tnbB0iQ8sfauY Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7s MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgIFADCABgkqhkiG9w0B BwEAAKCCF/QwggQyMIIDGqADAgECAgEBMA0GCSqGSIb3DQEBBQUAMHsxCzAJBgNV BAYTAkdCMRswGQYDVQQIDBJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcMB1Nh bGZvcmQxGjAYBgNVBAoMEUNvbW9kbyBDQSBMaW1pdGVkMSEwHwYDVQQDDBhBQUEg Q2VydGlmaWNhdGUgU2VydmljZXMwHhcNMDQwMTAxMDAwMDAwWhcNMjgxMjMxMjM1 OTU5WjB7MQswCQYDVQQGEwJHQjEbMBkGA1UECAwSR3JlYXRlciBNYW5jaGVzdGVy MRAwDgYDVQQHDAdTYWxmb3JkMRowGAYDVQQKDBFDb21vZG8gQ0EgTGltaXRlZDEh MB8GA1UEAwwYQUFBIENlcnRpZmljYXRlIFNlcnZpY2VzMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAvkCd9G7h6naHHE1FRI6+RsiDBp3BKv4YH47kAvrz q11QihYxC5oG0MVwIs1JLVRjzLZuaEYLU+rLTCTAvHJO6vEVrvRUmhIKw3qyM2Di 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