On 09/25/2011 10:49 AM, Edward Ned Harvey wrote:
From: [email protected] [mailto:discuss-
[email protected]] On Behalf Of Mark Woodward
Has anyone played with LVM and iSCSI? The ability to create an arbitrary
block device and map it to a shareable LUN is interesting, don't you
think?
Personally, I do the same thing in ZFS using zvol's for improved performance
and reliability and ability to snapshot. (LVM snapshot is a terrible
thing.)
Curious, have you done any serious benchmarking on LVM and snapshots? If
so, I'd like to know about some of your tests. I have been avoiding LVM
for a while for performance concerns, but with quad core systems
practically the baseline, a little extra CPU doesn't seem expensive any
more. The features it gives you are pretty good.
I have to inspect the code to see how snapshots are implemented, it
shouldn't be too costly after you modify a particular block for the
first time. I can see a slowdown because of "copy on write" for
snapshots, but it shouldn't be too too bad. Also, I'm not sure how it
manages multiple snapshots there is a right way and a wrong way, I hope
they did it the right way, but after your comment I'm dreading the
actual answer.
Is ZFS prime-time ready for Linux? If so, do you have any insights about
pros and cons for LVM?
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