Thank you all for your advice. Very helpful and informative. I have one final followup. As this RAID 5 array will be comprised of 4 nearly 80Gig serial ata disks, should I be using a larger chunk-size than 32 ? The software raid how-to hints that it should be larger but doesn't go into detail on what size should be used. By my calculation this will be a 225G (4 disk) raid 5 array. ((4-1)* 75G) = 225G My google for it turned up all sorts of conflicting advice on chunk-size. Regards, John Lange On Fri, 2004-05-07 at 09:29, Maarten van den Berg wrote: > On Friday 07 May 2004 07:52, John Lange wrote: > > Thank you Martin. You have some really great insights there. > > > > A couple of things about the raid sets confused me: > > > Each disk partitioned alike: > > > 1 30MB > > > 2 1/2 size_of_swap_ > > > 5 rest_of_disk > > > > > > Now you can create mds on the disk: > > > md0 raid1 sda1 sda2 sda3 sda4 > > > md1 raid1 sda1 sdb1 > > > md2 raid1 sdc1 sdd1 > > > md3 raid5 sda5 sdb5 sdc5 sdd5 > > > > First, why do we skip sdx3 and sdx4 on each disk and go directly to sdx5 > > for partition numbers? > > That is the first number a logical partition gets, as opposed to primary. > > > Second, I'm very confused by the way you divided up the raid sets.... > > I'm thinking you erred? I'm such a newb its possible I really don't > > understand whats going on so hopefully you can verify. > > I concur, there are errors. This is probably what he meant > > > md0: did you mean sda1 sdb1 sdc1 sdd1 ? > > Yes. It was obviously a typo. > > > md1: did you mean sda2 sdb2 ? > > md2: did you mean sdc2 sdd2 ? > > If it were me, why not do entire swap (not 1/2 size_of_swap) on a four-way > raid 1, just as with /boot ? Is way simpler. > > > md3: did you mean sda5 sdb5 sdc5 sdd5 ? > > > > And last, is it possible to build the system from the beginning on RAID? > > I'm using slackware. I see there is a section in the how-to for > > converting a red hat system after the fact but obviously it would be > > easier if I didn't have to do that. > > What proved the easiest for me is installing the OS on a temporary scrap > harddisk, build your raid sets from there on the real target disks and copy. > There is a more complicated way too, it involves setting failed-disk status on > the drive holding your original data. > > Maarten > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- John Lange BigHostBox.com (204) 885 0872 - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
