From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Turmel Subject: Re: Advice requested re: hard drive setup for RAID arrays Date: Wed, 4 Nov 2015 15:09:25 -0500 Message-ID: <563A65F5.4090301@turmel.org> References: <563A0462.9000200@turmel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Edward Kuns Cc: Brad Campbell , Linux-RAID List-Id: linux-raid.ids Hi Edward, On 11/04/2015 02:36 PM, Edward Kuns wrote: > Is there a reasonable way of finding out if a shorter setting is > appropriate for any specific drive? When I first learned all this (the hard way) with Seagate drives, 120 seconds was enough. You'll find that in old archives, 2011-ish. I don't remember who, but someone had a drive that took longer and suggested 180 seconds. > Or would you say in general it's not worth the effort of trying to > find out? Not worth the effort. It's a work-around for unsuitable devices until such time as you can retire them. > Would you expect this behavior to be any different for an SSD? I'd expect an SSD's worst case error recovery to be much shorter -- there's no positioning to wait for, nor any mechanical effects that'll make retrys meaningful. Phil