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VMware ESX 3.5

VCP Test preparation

  • MSCS only works with boot from local storage and not with boot from SAN
  • VMkernel is used for NFS, iSCSI, FC and VMotion
  • for a iSCSI software initiator it's recommended to use a separate VSwitch
  • balloon driver ⇒ vmmemctl
  • the service console and VMkernel must have different IP addresses
  • Maximum number of extents for VMFS3 ⇒ 32
  • max. 256 VMFS3 volumes per ESX server
  • for using VMotion the following two CPU chracteristics must be identical:
    • Vendor (Intel, AMD)
    • SSE3 support
  • “Red DRS Cluster” means that VM's are using more resources than fixed reservation allows
  • Web access: always installed on ESX and optional on VC
  • MEM.SamplePeriod: time period (seconds) of VM execution time the mem activity is monitored to estimate working set size (default 60s)
  • On NFS volumes you can't create VMFS datastore
  • Basic VI3 power states
    • Power off
    • Power on
    • Suspend
    • Reset
  • A Raw Device Mapping (RDM) is a special file that acts as proxy for a raw device
  • Advantages with VMware Consolidated Backup (VCB):
    • removes load on ESX ⇒ moves backup tasks to proxy machine
    • LAN free backups
    • hot, snapshot based backups
    • no backup agent on VM required
    • backup of off powered VM's
  • Round Robin will only use 1 path to send I/O
  • VM's communicate with Hardware using the Hardware Interface components
  • ESX traffic shaping uses the following parameters which can be configured:
    • Average Bandwidth
    • Burst Size
    • Peak Bandwidth
  • Maximum number of service console ports which can be created is 16
  • Only one CHAP credential supported per software initiator (unidirectional)
  • 802.1Q is the VLAN standard
  • minimal recommended ESX swap space: 544 MB, root partition: 5 GB on ESX 3.5 / 2560 MB < 3.5
  • there are 3 different policies for network load balancing:
    • route based on source and destination IP hash
    • route based on the originating virtual port ID (default)
    • route based on explicit failover order
  • VMotion works only between host that belong to the same datacenter
  • Virtual Storage:
    • up to 4 HBA's per VM
    • up to 15 targets per HBA
    • up to 60 per VM and max. 256 per ESX host
  • a VMFS datastore can span over 32 extents (disk partitions)
  • In which situations does VMware restart a VM on a other host?
    1. An ESXServer in the cluster becomes isolated from the network
    2. An ESXServer in the cluster is manually powered off
  • During the initial installation process, ESX 3.0 Server supports access to 128 LUNs
  • VMware Coverter enterprise supports two types of cloning: local and remote
  • min. capacity of a VMFS3 LUN: 1200 MB
  • the settings Mem.ShareScanTime and Mem.ShareScanGHz control how often the system will check for Memory sharing opportunities
  • Cold migration requires the VM to be powered off or suspended
  • Mem.BalancePeriod specifies the time interval in seconds for memory reallocation (default 15s)
  • Resource Pool attributes:
    1. CPU Shares
    2. Memory Shares
    3. Reservation / Expandable reservation
    4. Limit
  • VM's can run in two different modes:
    1. Direct execution mode
    2. Virtualization mode
  • Requirements for VCB: a physical machine running Win2k3
  • Minimal ports that must be open to connect with a VI Client to a ESX host: 443 (https), 902 (remote control and viewing of virtual machines, vmware-authd)
  • vSwitch policies constist of…
    • Layer 2 Security policy
    • Traffic Shaping policy
    • Load Balancing & Failover policy
  • For an active/active iSCSI target the recommended failover policy is fixed mode
  • ESX server provides you with a multipathing driver which is compatible with any supported storage array
  • for MSCS quorum disks FC SAN storage should be used
  • when configuring multiple service consoles, they must use different networks
  • iSCSI SendTargets are :?:
  • vmhba2:0:0 ⇒ adapter:target_id:LUN:partition
  • The server manages network and disk resources on per host basis.
  • VMKernel manges most of the physical resources on the harware, including
    • Memory
    • Physical processors
    • Storage controllers
    • Networking
    • Keyboard, video and mouse
  • Requirements when booting from SAN
    • SAN connections must be attached to a switch fabric topology
    • HBA BIOS for the Fibre Channel card must be enabled and correctly configured
  • The maximum number of systems guided consolidation which can simultaneously be analyzed is 100
  • A red X on the topology map next to a DRS/HA Cluster means that host is not compatible for VMotion
  • Available types of SCSI Bus Sharing are
    • None
    • Virtual
    • Physical
/srv/ · Last modified: 2009/08/15 12:14 (external edit)