From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dominic Raferd Subject: Re: SSD + Rust as raid1 Date: Fri, 31 May 2013 08:47:00 +0100 Message-ID: <51A85574.8080709@timedicer.co.uk> References: <51A7C36F.4030605@timedicer.co.uk> <20130531133018.77cd9285@natsu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130531133018.77cd9285@natsu> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 31/05/2013 08:30, Roman Mamedov wrote: > On Thu, 30 May 2013 22:23:59 +0100 > Dominic Raferd wrote: > >> I am wanting to (re)set up my raid1 array with 1 SSD partition >> (/dev/sda2) and 1 'rust' drive partition (/dev/sdb1) , both 240GB. SSD > Sorry but what is "Rust drive partition"? At first I thought it's some > software layer like 'bcache' or some other non-regular block device. Then I > think I got it, but can you please leave at home your own petty cutesy > terminology when asking a serious question on a serious mailing list? Sorry no offence intended! I just mean a conventional spinning platter hard disk drive. > And yes I use a HDD+SSD RAID1 for a very long time, to get some improvement > (though debatable how much) you can also mark the HDD as "write-mostly" > (see man md). This is my idea too (see my OP), but I am concerned about optimisation (--write-behind, --bitmap and --bitmap-chunk settings) especially for writes.