On Tuesday March 24, john.robinson@xxxxxxxxxxxxxxxx wrote: > On 24/03/2009 22:15, Dylan Distasio wrote: > > Hi all- > > > > I would like to put together a RAID10 array utilizing 2x1TB drives and > > 2x500 gig drives I have in my home Linux server. Is the best way to do > > this to create 2 separate RAID1 arrays, one for each set of drives, and > > then a RAID0 array made up of the RAID1 ones? I just wanted to verify > > that I am going about this correctly, and also get input on whether > > there are any disadvantages to this setup. I would prefer not to split > > these up into two separate RAID10 arrays because I want the combined > > space available under one. Thanks for any comments. > > I think you can mix drive sizes under md RAID-10 - much as you're > proposing to above with your RAID-0 of different-sized RAID-1s - and md > will just do the Right Thing. Incorrect. RAID-10, as with all levels that provide redundancy and hot-spares etc, used the same amount of space on all devices. Only RAID0 and Linear make use of all available space. > I'd go for testing that and play with > layouts (near, far, offset) to suit your requirements before worrying > about setting up RAID 1+0. > > Actually with your hardware I'd probably set up a 1TB RAID-0 with the > 500G drives then make a RAID-5 from the 3 1TB devices (2 raw drives plus > one md RAID-0). If you can be bothered try benchmarking that too; as > well as giving you more storage I think it'll probably match the RAID-10 > or RAID 1+0 for performance. I think that is a very reasonable option, as is the original suggestion. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
