On 09/07/19 23:17, Luca Lazzarin wrote: > Hi all, > > actually a server of mine has a 2x1TB Raid 1 array. > The disks are becoming old and to avoid possible problems I would like > to replace them. > > Moving from 1TB of space to 2TB could be enough, but since I have to buy > the new disks I am considering different possibilities, which are: > 1) 2x2TB Raid 1 array; > 2) 3x2TB Raid 1 array; > 3) 3x1TB Raid 5 array; > 4) 3x2TB Raid 5 array (I know, this will give me 4TB of space, which > probably are enough for the next 10 year); > 5) 4x1TB Raid 6 array. > > Which one, in your opinion, would the the best solution? What's the price difference between 1TB and 2TB drives? Significant, or not much? If the price difference isn't that much I'd go for the larger drives every time. > > Thank you for your suggestions. > Do you have spare disks to back up on to? The problem with both raids 1 and 5 is that if you have an error, you don't know which data is correct, unless you run a check-summing file system on top or something like that. At least with raid 6 you can run a repair utility that will try to correct your data. Is speed important? raid 1 is probably best. I wouldn't run raid 1 over three disks - if you're thinking of that you're probably better off with raid 10. If you want more definite answers than this, though, you're going to have to provide more information about how the server is used - is it home or business, is speed or resilience more important, what do you actually want from the array? Each version has pros and cons. Cheers, Wol
