[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [Xen-users] iSCSI and LVM

  • To: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Tue, 15 Jun 2010 20:33:39 +1000
  • Cc:
  • Delivery-date: Tue, 15 Jun 2010 03:34:47 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcsMZTrJHk6P5l0GTHOjxbPCaXqzfwADUt2QAACuLlYAABZuMA==
  • Thread-topic: [Xen-users] iSCSI and LVM

> In the case of iSCSI you would just create an iSCSI device for each LV
> of running lvm on top of your iSCSI volume.
> James
> ---
> Does that not mean that I would have to export nearly 600 LUNs?

If you have 600 lv's then yes, and that may well be a better option.
With 600 lv's all running on the same vg, clvm performance if
snapshotting was ever implemented would suck terribly - every time the
lv was written to and the snapshot received a copy of the original
block, all other nodes would need to know about the new metadata change
or they would read bad data from the snapshot.

I don't know what the per-iSCSI-LUN overhead is vs the clvm overhead
though... I guess it depends on how many nodes you have.


Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.