Company News

Guru-host goes to Centos.org

CentOS Linux
We are thrilled to announce that Guru-host.eu is a sponsor of CentOS project.
A new repository with 100Mbit Internet Connection on Dual Core Xeon CPU will be available to all our customers along with European citizens. This will server data much faster than the US repositories. Guru-host customers will be able to update their CentOS servers without calculating traffic (bandwidth) as the server is running inside our core network. CentOS is 100% compatible with Redhat Enterprise Server.

Enterprise Email Hosting

Guru-host is now offering a wide range of Zimbra hosted packages based on latest Zimbra Collaboration Suite. With Zimbra you will be able to sync in real time your mobile phone no matter it's Operating System, share documents, write online documents and many many other interesting features available only on Zimbra. Squirrelmail, Gmail, Horde and other IMAP clients are a way behind Zimbra. Contact us to setup a demo account for you. Pricing details along with usuful information about how Zimbra works can be found under http://guru-host.eu/en/Zimbra.


Network Storage up to 8TB per customer

We can now deliver iSCSI storage on our enterprise class Storage Area Network (SAN) which is based on the industry leading Lefthand Networks platform from HP. Read more

Contact us for a custom quote
Virtuozzo vs XEN virtualization

Virtuozzo fits into "Operating system-level virtualization" and XEN into "Native Virtualization". Virtuozzo is just a software layer and is almost a glorified "jail" within the system, thereby using a shared kernel and host operating system. XEN, similar to Parallels, VMware and Microsoft Virtual Server, simulate hardware in a guest operating system. This allows for the guest to run exactly like a standalone server would, as far as the end-user is concerned. This type of virtualization tends to be more stable due to its architecture.

Generally Xen is much more versatile, when oversold Xen will typically give much better performance as it's memory resources are dedicated vs shared on VZ (OpenVZ/Virtuozzo). Xen usually has better CPU performance under high load as the bare-metal hypervisor will handle all of the scheduling vs the VZ kernel scheduler.

Pro's and Con's of each:

Xen:
+ Dedicated memory
+ Dedicated swap
+ Better feature set depending on kernel used (VPN/Tunneling/IPv6)
+ Supports Intel VT (Can run Windows guests with appropriate hardware)
+ High CPU performance, virtual SMP supported for guest VMs
+ Supports NetBSD / Solaris in paravirtual (native) guest
+ Guest support for SELinux/MAC frameworks (depending on kernel)
- Requires dedicated RAM for each VM
- More expensive to host
- Requires dedicated hard drive space for each VM
- Lower I/O performance due to paravirtualization
-- Much lower I/O performance in full virtualization (Windows Guests)
- Longer provisioning / setup times due to custom image creation
- More difficult to backup (pretty much requires LVM snapshots for on-demand backup)

VZ:
+ Very low overhead hosting per VM
+ Allows massive overselling due to shared RAM/Disk space, much cheaper to host / lower prices for the end user
+ Near native performance for high I/O loads (Disk/Net)
+ Much easier to setup/backup
- Starts killing processes when out of RAM (no swap)
- Tends not to allow custom things like VPN/Virutal devices without explicit support from your hosting provider

Posted on: 31/08/2010





Back to Home page