Re: [Xen-users] ssd cache

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

So, a couple of things:
1) IMHO, installing Xen on an SSD is a waste of an SSD.  In workstation 
environments, you put the O/S on an SSD because it significantly speeds up boot 
time on systems where you are repetitively and frequently booting the system.  
In server environments, you use SSDs to speed up systems where disk I/O is at a 
premium.  So, in a server environment, putting the host hypervisor on an SSD 
doesn't make a whole lot of sense - you're going to boot the system and keep it 
running, so why not put the Xen hypervisor on a USB flash drive, or SD card, or 
something similar?
2) For using the SSDs as cache, this is really outside the scope of Xen itself 
and more how you architect dom0 and your domain storage.  There are filesystems 
that support using SSDs as cache devices - ZFS and, I believe, Btrfs, for 
example - and you can use those filesystems for domU disk storage if you like.  
Other than that, most of the products I know of that use SSD for 
caching/offload, are commercial and not open source, but maybe someone else has 
some ideas?  If nothing else you could probably make the SSD into an LVM volume 
group, and you could create LVs for each Xen domU that you could then use for 
pagefiles or the like, in addition to the traditional disks.

-Nick

>>> On 2013/06/27 at 11:36, jacek burghardt <jaceksburghardt@xxxxxxxxx> wrote: 
> Is anyone using ssd as cache for xen? I found great deal on co locating my
> server and I am planing on installing  xen on 128 gb ssd card and 2 tb for
> lvm. IS there a way to use ssd.




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