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xen-devel
Re: [Xen-devel] experience with gnbd
Ian Pratt wrote:
In the last couple of days we've been playing around with gnbd as
an alternative to iSCSI, as we found that the performance of the
current cisco linux iSCSI implementation was fairly awful talking
to our NetApp hardware target.
Cool, need to try this as an alternative to the 'iscsitarget' from
sourceforge, even though that also works fairly well, serving disks from
dom0.
What kind of performance improvement did you experience? This is not
just due to the NetApp filer being on a separate network with a router
or firewall in between (if I recall correctly)?
I haven't tried it, but the csnap writeable snapshot driver looks
worth investigation too -- its design is rather more reassuring
than lvm2 snap.
Perhaps it is better to have the writable/client-specific parts of your
root filesystem (/tmp, /var/tmp, perhaps /etc) mounted via NFS (or
something else, or just as symlinks to a separate device) on top of a
read-only generalized rootfs (like the debian diskless packages used to
do), rather than trying to handle this at the block-level. It seems to
me all sorts of bad stuff can happen with a writable block-level
overlay, for instance if you try to upgrade the filesystem underneath.
Jacob
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