Date: Wed, 27 Apr 2016 01:50:17 -0400 From: "Michael B. Eichorn" <ike@michaeleichorn.com> To: DH <dhutch9999@yahoo.com>, Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-fs@freebsd.org Subject: Re: How to speed up slow zpool scrub? Message-ID: <1461736217.1121.17.camel@michaeleichorn.com> In-Reply-To: <381846248.2672053.1461695277122.JavaMail.yahoo@mail.yahoo.com> References: <381846248.2672053.1461695277122.JavaMail.yahoo.ref@mail.yahoo.com> <381846248.2672053.1461695277122.JavaMail.yahoo@mail.yahoo.com>
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--=-jOW/Jn9dWs3bk6QDmUct Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2016-04-26 at 18:27 +0000, DH via freebsd-fs wrote: > Take a long look at the FreeNAS documentation and discussion threads > - if you're not using a sufficient quantity of ECC ram with ZFS > you're asking for anomalous behavior.=C2=A0=C2=A0I'm not a ZFS expert, bu= t the > documentation leads me to think inadequate system ram is certainly a > consideration.=C2=A0=C2=A0 >=20 > FreeNAS requires a minimum of 8 GB of ECC ram when used with ZFS. <begin friendly infodump> It does not *need* to be ECC ram, ECC is just *highly recommended*. As one of the key features of zfs is bitrot prevention, it makes sense to protect against bitrot everywhere. Zfs (and thus freenas) is just fine with non-ecc ram. Just, like for any filesystem if the bit is flipped in ram it will be recorded as such on disk. And 8 GB is probably a safe minumum without tuning, but there are sufficent tunnables to do ~4 GB easily. This is not saying that you are incorrect about best practice, I am just picking nits since ECC and minium RAM are can be one of the more sensitive topics for ZFS-enthusiasts. --=-jOW/Jn9dWs3bk6QDmUct Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEqAw ggYwMIIFGKADAgECAgMOXcYwDQYJKoZIhvcNAQELBQAwgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQK Ew1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVu dCBDQTAeFw0xNTA2MTMyMDI0NDZaFw0xNjA2MTQwMDM1NTBaMEgxHzAdBgNVBAMMFmlrZUBtaWNo YWVsZWljaG9ybi5jb20xJTAjBgkqhkiG9w0BCQEWFmlrZUBtaWNoYWVsZWljaG9ybi5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDJVdWALPz5h2s5zUQGIJYl6Vp8FPtZNko8q/3s crCsxXJLprMaDdpnqTsmkbmEfKvsqPQE6HVOpGxVRTl/tCm+VvouW9eY9ITMigb1OnHdU13CKO0j 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