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Re: [linux-lvm] Fun and games with mirroring



On 05/23/2012 03:07 PM, Les Mikesell expounded in part:
I thought these days you could raid the whole disk and put partitions on the raid, although I've never done it that way. I have 2 complaints about MD. One is that it doesn't handle errors/retries on members very well - it will kick members that are perfectly fine running standalone or as the last remaining member, and the other is that partitions over 2TB need a new format that the kernel doesn't auto-detect. Much of the reason I liked MD in the first place was its ability to assemble things correctly at boot regardless of the drive's physical attachment or location.
You can raid the whole disk. But having smaller partitions makes it easier to distribute them over odd numbers of disks. Back when I ran AIX, you could add a disk of any size to the VG, and mirrored LVs would allocate LPs from physically separate PPs. You never had to worry about matching disk sizes. With MD, you can also add odd disk sizes and fully use them, but you have to do it manually, and more solutions are available with smaller partitions. (But having too many is too tedious.)


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