From mboxrd@z Thu Jan 1 00:00:00 1970 From: joystick Subject: Re: 3TB drives failure rate Date: Mon, 29 Oct 2012 00:59:37 +0100 Message-ID: <508DC6E9.8070001@shiftmail.org> References: <11510711257.20121028131527@oudeis.org> <508D61A1.7020106@wildgooses.com> <508D65CF.1080904@gmail.com> <508DADC3.4080104@shiftmail.org> <508DB08D.20002@meetinghouse.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <508DB08D.20002@meetinghouse.net> Sender: linux-raid-owner@vger.kernel.org To: Miles Fidelman Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 10/28/12 23:24, Miles Fidelman wrote: > joystick wrote: >> >> This thing of "drives falling out of RAID" I have heard many times, >> but really don't know what people are talking about. >> How could a drive fall out of a RAID? A RAID is nothing special, it's >> just read/write commands given to a drive by a process called MD. >> If the drive drops out of RAID it means it would have dropped out of >> a normal computer doing normal I/O >> Please explain > > The RAID erroneously thinks that a drive has failed, and drops it from > the array. Due to missing ERC/TLER and a bad sector, or another reason I am not aware of? And if it is "another reason", would you please explain how is that different from what happens in a desktop? How come they are acceptable for use in a desktop but they drop out of RAID? Why is RAID so special?