On Mon, Feb 7, 2011 at 14:56, David Brown <david@xxxxxxxxxxxxxxx> wrote: > On 07/02/2011 12:41, Henrik Olsson wrote: >> >> Hi, >> >> One of the drives in my raid1 recently crashed and it looks like all >> the replacement disks (2TB) i can find use 4K sectors, but the old >> ones were 512 bytes. >> Are there any issues with having a raid1 array with different sector >> sizes for the drives? >> >> Regards, >> Henrik > > I can't answer for sure, but I would think there would be no problem as long > as you make sure your partitions are 4 KB aligned. AFAIUI, Linux always > writes in 4K blocks to the disks anyway, so alignment is the only issue - > and that's a performance issue, not a correctness one. > > Yes, that's the impression i've gotten after reading about it too. As long as i create a 4KB aligned partition on the new drive that is at least as large as the old one and replace the old one with it in the array, it should just work? I run dmcrypt and then lvm on top of the raid array though, trying to figure out what needs to be done with alignment with those... Worst case i should be able to create a new properly aligned array/dmcrypt/lvm on the new drive, copy the old data over and add the old working drive to the new array since if it's 4K aligned it should also be 512B aligned? /Henrik -- 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
