| |
|
 |
|
 |
|
|
|
| |
|
|
xen-users
Re: [Xen-users] File System Doubt
On Sat, Sep 22, 2007 at 11:41:18AM -0600, Scott Serr wrote:
>
> Here is a question... whats the preferred fastest backend to store a
> disk image on? Or...
I made experiments putting the file belonging to a domU in a ramdisk,
doing file-benchmarks in the domU obviously also only happen in the
dom0-ram, guess not much could beat that.
> maybe the fastest Xen virtual drive is actually a raw partition or RAID
> or logical volume management?
You should layer this a bit.
First: raid or not raid is a question of money/speed/how reliadble your
want your data to be stored.
Second and indepently: lvm vs. file-backend.
If its worth the hassle benchmark with your usecases yourself, from my
benchmarking ive seen filebased domU on internal disks have been faster
for i/o than ones on lvm.
On iscsi lvm did a bit better than filebased. Filesystem was xfs, and
the test was only raw writing in the domU. And just using the ancient
file: syntax for file-domU since SuSE just recently fixed the tap:aio
support.
> filesystem on /dev/md0 and that is where my image files are. I expected
> that this would be quite fast, but my drives seem to sketch around
> ALOT. I can't imagine that LVM would buy you any more performance.
> Would ext3?
>From what i recall from filesystem-benchmarks with reiser you get a bit
better performance, especially when using many small files (which isnt
the case here) and at the cost of higher cpu-usage in dom0 here.
Christian
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
|
|
|
| |
|
Home