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Re: [linux-lvm] Quick Question RE Snapshots

In my experience yes - if you are doing long sequential writes, snapshot turns them into random IO. If you were doing short random writes to begin with, then snapshot should not have such a huge relative effect, because the non-snapshot performance is already slow.
Larry Dickson
Cutting Edge Networked Storage

On 10/27/09, Ryan Anderson <ryan worldspice net> wrote:
I'm sure this has been covered before, but I didn't see it in the
archive: Is a near 90% drop in write performance "normal" snapshot
behavior? If so, :(

If not, are there any good resources I should be looking at? Every
search I perform comes up with one of two types of articles on the matter:

1) Snapshots are  awesome! They let you...(list of really nifty things)

2) Snapshots suck! My system is completely useless while they're active!

Ryan Anderson
(901) 843 9300
Systems Engineer
WorldSpice Technologies

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