Re: Xen Dom0 vs. DomU disk I/O

["Niels Dettenbach (Syndicat IT&Internet)" <nd%syndicat.com@localhost>]

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Stephan <stephanwib%googlemail.com@localhost> schrieb:

>Well, when I set up a vnd device backed by a sparse file on ffs and
>create
>another ffs filesystem on it, I barely see any speed loss on it (80 -
>90MB/s).

sparse by principe / usually should be slower then plain files as virtual disk 
backends as there is additional overhead to handle.

 There are also many other hypervisors operating on plain
>files.
Yes, but using file backed disks is usually significantly slower then "real" 
partitions / disks - independently from the type of Hypervisor. This is OK as 
long as performance efficiency is not a goal for a VM.

>Either way, I have to reinstall my box with another slice for my
>testing.
>
>It would be nice if anyone could provide some data from a NetBSD dom0
>instead of a Linux one.
Sorry, did not have any NetBSD Dom0 yet anymore (as i need further hardware 
access to the metal not offered by NetBSD) - but the principes with file based 
disks should be the same.

good luck,


Niels.
- --
Niels Dettenbach
Syndicat IT&Internet
http://www.syndicat.com
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