Tuesday, November 20, 2012

Correlating vCenter Server and ESXi/ESX host build numbers to update levels

VMware software versions can be found on VMware KB Article 1014508.

Very nice list of VMware ESX server build numbers and versions mappings together with mapping to VMware tools (aka vmtools) versions is at https://packages.vmware.com/tools/versions

Brocade Secure SAN Zoning Best Practices

White Paper

This paper describes and clarifies Zoning, a security feature in Storage
Area Network (SAN) fabrics. By understanding the terminology and
implementing Zoning best practices, a Brocade®
 SAN fabric can be
easily secured and scaled while maintaining maximum uptime.
The following topics are discussed:
• Zoning defined and LUN security in the fabric
• Identifying hosts and storage members of a zone
• How do SAN switches enforce Zoning?
• Avoiding Zoning terminology confusion
• Approaches to Zoning, how to group hosts and storage in zones
• Brocade Zoning recommendations and summary

What is Zoning?
Zoning is a fabric-based service in Storage Area Networks that groups host and storage nodes
that need to communicate. Zoning creates a situation in which nodes can communicate with
each other only if they are members of the same zone. Nodes can be members of multiple
zones--—allowing for a great deal of flexibility when you implement a SAN using Zoning.
Zoning not only prevents a host from unauthorized access of storage assets, but it also stops
undesired host-to-host communication and fabric-wide Registered State Change Notification
(RSCN) disruptions. RSCNs are managed by the fabric Name Server and notify end devices of
events in the fabric, such as a storage node or a switch going offline. Brocade isolates these
notifications to only the zones that require the update, so nodes that are unaffected by the
fabric change do not receive the RSCN. This is important for non-disruptive fabric operations,
because RSCNs have the potential to disrupt storage traffic. When this disruption was more
common, that is, with older Host Bus Adapter (HBA) drivers, RSCNs gained an undeserved
negative reputation. However, since that time most HBA vendors have addressed the issues.
When nodes are zoned into small, granular groupings, the occurrences of disruptive RSCNs
are virtually eliminated. See a discussion of single HBA zoning in the section of this paper
entitled, “Approaches to Zoning.”

ESX and disk issues

ESX 4 & 5: Resolving SCSI reservation conflicts
In this KB article is described the process how to find which ESX host has SCSI reservation on LUN

ESX 5: Vmware vSphere 5 dead LUN and pathing issues and resultant SCSI errors

All ESX versions: After repeated SAN path failovers, operations that involve VMFS changes might fail for all hosts accessing a particular LUN

ESX 4.x: ESX/ESXi hosts in APD may appear Not Responding in vCenter Server

ESX 4.1: Virtual machines stop responding when any LUN on the host is in an all-paths-down (APD) condition

ESX 5.1 has significant improvements with APD a PDL

Saturday, November 17, 2012

ESX Automated Provisioning on CISCO UCS

This is the demo of automation showing how VMware vSphere ESX host can be
 automatically deploy to CISCO UCS Service Profile which is booted from SAN.

If you want to know more don't hesitate to write comment bellow the blog post.