[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Xen + SAN
On Fri, Jun 24, 2011 at 2:03 PM, Simon Hobson <linux@xxxxxxxxxxxxxxxx> wrote: > Fajar A. Nugraha wrote: > >> If you need SAN for other purposes (e.g. live migration), then others >> have already provided some good example. However, personally I'd check >> again with the requirement. It's possible that the "best" setup for >> you might be: >> - a zfs-based storage appliance (e.g. napp-it, nexentastor) with lots >> of disks (mirror), lots of memory, and SSD for L2ARC/SLOG to provide >> high I/O throughput >> - nfs and image-based disks to provide easy management >> - tap:aio or tap:vhd on Xen side > > Do you have any feeling for how such a setup might compare, performance > wise, with a local disk setup with the same disks and LVM and a partition > per client block device ? Local disk with block devices should definitely be faster. But here's the catch: notice I specifically suggest zfs, lots of memory, and SSD? zfs/zvol by itself has lower performance compared to plain block device. However it's also the only filesystem that I know of that can use SSD to speed up both read and write. It's something that LVM/ext4 can't do. So it just might be able to offset performance penalty of zfs + nfs + file-based-image. ... or if you have the money, simply buy EMC/Netapp-base/Oracle storage with cache SSDs :D -- Fajar _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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