From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roman Mamedov Subject: Re: 3TB drives failure rate Date: Mon, 29 Oct 2012 10:29:19 +0600 Message-ID: <20121029102919.1134a797@natsu> References: <11510711257.20121028131527@oudeis.org> <508D61A1.7020106@wildgooses.com> <508D65CF.1080904@gmail.com> <508DADC3.4080104@shiftmail.org> <508DB08D.20002@meetinghouse.net> <508DC6E9.8070001@shiftmail.org> <508DC922.7040400@meetinghouse.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/SO0VcOtt1EsXe002DgJpNH7"; protocol="application/pgp-signature" Return-path: In-Reply-To: <508DC922.7040400@meetinghouse.net> Sender: linux-raid-owner@vger.kernel.org To: Miles Fidelman Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/SO0VcOtt1EsXe002DgJpNH7 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Sun, 28 Oct 2012 20:09:06 -0400 Miles Fidelman wrote: > Two separate issues. > The comments about "dropping out of raid" had to do with drives that are= =20 > slow to come out of sleep mode - causing hiccups when the RAID=20 > hardware/software simply doesn't see the drive, and drops it. There are no drives in good working order that would come out of sleep mode= SO slowly, that the Linux kernel ATA subsystem would even give up trying and return an I/O error from it (and it's only after that point, when this begi= ns to become mdraid's concern). I have yet to see even any first sign of "SATA frozen" due to drive sleep mode, let alone to imagine this last through all the port resets and speed step-downs the SATA driver will attempt. So the "sleep" issue is not relevant with Linux software RAID, and if you're still concerned that it might be, you can just reconfigure your drives so t= hey don't enter that sleep mode.=20 --=20 With respect, Roman ~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Stallman had a printer, with code he could not see. So he began to tinker, and set the software free." --Sig_/SO0VcOtt1EsXe002DgJpNH7 Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlCOBh8ACgkQTLKSvz+PZwgKDgCfVyH1hohyjvwTDi+LRX+wJhcB U7EAoIdgUQiBfZPeEVqxh9uLXcxe0kiF =eR1E -----END PGP SIGNATURE----- --Sig_/SO0VcOtt1EsXe002DgJpNH7--