| | We consider the following virtualization installation scenarios for Virtual SCSI and Virtual Ethernet: |
| | |
| | h2. Virtual SCSI |
| | - *Scenario #1*: One VIO server providing one virtual disk to clients |
| | - *Scenario #2*: One VIO server providing multiple virtual disks to clients (more secure setup) |
| | - *Scenario #3*: Two VIO servers providing virtual disk(s) to clients (HA-setup) |
| |  | - *Scenario #4*: Two VIO servers providing virtual disk(s) (LUNs in the SAN) to clients (HA-setup) |
| | |
| | The following table shows the details of the three virtual ethernet installation scenarios: |
| | |
| | ||VIO Scenario #1||VIO Scenario #2||VIO Scenario #3||VIO Scenario #4|| |
| | |!VIO-Server-Simple.png|thumbnail!|!VIO-Server-Medium.png|thumbnail!|!VIO-Server-HA.png|thumbnail!|!san-vio-multipath.png|thumbnail!| |
| | |
| | h4. Scenario #1 |
| | * Simplest setup |
| | * Failure of VIO server causes failure of all clients |
| | * Failure of disk which provides the disc space for the client causes also client to fail |
| | |
| | h4. Scenario #2 |
| | * More elaborate setup |
| | * Requires SW-RAID (RAID-1) setup on clients |
| | * Failure of VIO server causes failure of all clients |
| | * Failure of one of the two disks (must be separate physical disks) which provide the disc space for the client does *not* cause client to fail |
| | |
| | h4. Scenario #3 |
| | * Most elaborate setup |
| | * Requires SW-RAID (RAID-1) setup on clients |
| | * Failure of one VIO server causes *no* failure of clients |
| | * Failure of one of the two disks (each VIO server provides one) which provide the disc space for the client does *not* cause client to fail |
| | |
 | | |
| | h4. Scenario #4 |
| | * Very flexible and reliable setup |
| | * Requires SAN attatchment to VIO and mdadm with multipath personality on clients |
| | | * Requires SAN attachment to VIO and mdadm with multipath personality on clients |
| | * Failure of one VIO server causes *no* failure of clients, VIO reboot no additional actions on clients (there is no need to re-add a disk to the RAID device) |
| | * Both VIO servers are providing different paths to the same disk (which is a LUN in the SAN) |
| | * You can easily exchange hardware, just attaching the new VIO server to the SAN and mapping the same LUN for the client |
| | * It is a kind of a SAN boot, but virtualized and without any SAN boot complexity |
| | |
| | h2. Virtual Ethernet Installation Scenarios |
| | - *Scenario #1*: One VIO server with single ethernet device as Layer 2 router |
| | - *Scenario #2*: One VIO server with multiple ethernet devices as Layer 2 routers |
| | - *Scenario #3*: Two VIO servers with single ethernet device as Layer 2 routers |
| | - *Scenario #4*: Two VIO servers with multiple ethernet devices as Layer 2 routers |
| | |
| | The following table shows the details of the four virtual ethernet installation scenarios: |
| | |
| | ||VLAN Scenario #1||VLAN Scenario #2||VLAN Scenario #3||VLAN Scenario #4|| |
| | |!Virtual-Lan.png|thumbnail!|!Bond-Virtual-Lan.png|thumbnail!|!HA-Virtual-Lan.png|thumbnail!|!HA-Bond-Virtual-Lan.png|thumbnail!| |
| | |
| | h4. Scenario #1 |
| | * Simplest setup |
| | * Failure of network adapter in VIO server causes also network failure for all clients with same VLAN ID |
| | |
| | h4. Scenario #2 |
| | * More elaborate setup |
| | * The difference to scenario #1 is that additionally channel bonding (also known as CISCO EtherChannel) is used on the VIO server |
| | |
| | h4. Scenario #3 |
| | * Very elaborate setup |
| | * Requires channel bonding (also known as CISCO EtherChannel) setup on clients |
| | * Failure of one VIO server causes *no* failure of clients |
| | * Failure of network adapter in one VIO server causes also *no* network failure for clients with same VLAN ID |
| | |
| | h4. Scenario #4 |
| | * Most elaborate setup |
| | * The difference to scenario #3 is that additionally channel bonding (also known as CISCO EtherChannel) is used on the VIO server |
