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Re: [linux-lvm] Performance impact of LVM



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Some uses of LVM *could* increase I/O wait time. It's easy to paste new extents onto existing volumes, and the new extent probably won't be contiguous with the old one. So you *could* see longer average seek delays due to additional arm travel distance between extents. It's strongly dependent on access patterns.

However this effect is probably down in the noise for most systems. The only way to know if it's a problem for you is to measure. I would expect that, given contemporary amounts of caching on the drive, the controller, and in the OS, you probably won't see it unless you are driving your storage *really* hard. If you do, dump/recreate contiguously/restore will make it go away.

- -- Mark H. Wood, Lead System Programmer mwood IUPUI Edu
Typically when a software vendor says that a product is "intuitive" he
means the exact opposite.

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