From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Evans Subject: Re: raid10 How do I tell what side of the mirror a disk is on? Date: Fri, 29 Jan 2010 23:22:33 -0800 Message-ID: <4877c76c1001292322u2f01d47auaa6041cd701e4176@mail.gmail.com> References: <1264777247.29409.64.camel@thor> <87k4v0wjx1.fsf@frosties.localdomain> <1264810392.1880.5.camel@michal-laptop.sawicz.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1264810392.1880.5.camel@michal-laptop.sawicz.net> Sender: linux-raid-owner@vger.kernel.org To: =?UTF-8?Q?Micha=C5=82_Sawicz?= Cc: Goswin von Brederlow , linux-raid@vger.kernel.org List-Id: linux-raid.ids 2010/1/29 Micha=B3 Sawicz : > Dnia 2010-01-30, sob o godzinie 00:50 +0100, Goswin von Brederlow pis= ze: >> Does it matter? If one disk fails you know the next disk failure has= a >> 33+% chance of data loss and knowing which disk will be critical >> doesn't >> change that. > > For me it was important when I needed to have the array running (root > fs) with only 2 disks out of 4 (not enough controllers). It would be > nice to be able to tell which are mirrors, which are striped. > > -- > Cheers > Micha=B3 (Saviq) Sawicz > As was noted in another reply recently; write down drive serial numbers. Drive serial numbers can be obtained online via tools like smartctl or hdparm (read their manuals, they're useful tools). In your case you have a 50% chance of finding a working combination the first time, and swapping only one cable from a disk that is connected to one that's not would resolve the issue. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html