From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ram Ramesh Subject: Re: When do you replace old hard drives in a raid6? Date: Sun, 6 Mar 2016 18:52:57 -0600 Message-ID: <56DCD0E9.8040506@gmail.com> References: <56DB465E.9010703@gmail.com> <56DCCB55.1060906@turmel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <56DCCB55.1060906@turmel.org> Sender: linux-raid-owner@vger.kernel.org To: Phil Turmel , Linux Raid List-Id: linux-raid.ids On 03/06/2016 06:29 PM, Phil Turmel wrote: > On 03/05/2016 03:49 PM, Ram Ramesh wrote: >> I am curious if people actually replace hard drives periodically because >> they are old or out of warranty. My 5 device raid6 has several older >> drives (3/5 are 3+ years old and out of warranty) They seem fine with >> SMART and raid scrubs. However, it makes me wonder when they will die. >> What is the best policy in such situations? More importantly, do people >> wait for disks to die and then replace or have some ad hoc schedule of >> replacing (like every 6mo replace oldest) to keep things safe? > I replace drives when their relocation count hits double digits. In my > limited sample, that's typically after 40,000 hours. > > Phil Thanks for the data point. 40K hours means roughly 4.5 years with 24/7. That is very good. You use enterprise drives? Mine are desktop (and may be one HGST NAS) My SMART is perfect except for power on hours. I am going to take it easy for now as I have a spare (not part of a RAID) just in case something bad happens. Ramesh