VMware

VMWare Internals: Understanding how vMotion works

Understanding how vMotion works This is my first article on detailing VMWare Internals and in this article we discuss about how VMWare vMotion works and what happens in the background during the vMotion. About vMotion vMotion is one of the key feature of VMWare technology. vMotion is a live migration/movement of running Virtual Machines (VMs) between physical hosts with ZERO downtime and offering continuous service availability. It is transparent to the VM Guest OS & applications as well as to the end user.  The primary use case is to support manual load balancing of your ESX servers in cases like, […]

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Citrix

Functions of the Local Host Cache (LHC) in Citrix IMA

Information This article contains information on functions, refreshing, and recreating of the Local Host Cache (LHC). Functions of the Local Host Cache Each XenApp server stores a subset of the data store in the LHC. The LHC performs two primary functions: Permits a server to function in the absence of a connection to the data store. Improves performance by caching information used by ICA Clients for enumeration and application resolution. The LHC is an Access database, Imalhc.mdb, stored by default in the <ProgramFiles>\Citrix\Independent Management Architecture folder. The following information is contained in the LHC: All servers in the farm, and […]

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Active Directory, Windows Technologies

FIX: Active Directory Replication errors: The RPC server is unavailable. Or The target principal name is incorrect. Or The Kerberos client received a KRB_AP_ERR_MODIFIED error.

Scenario: One of your Site Domain Controller went Out-of-Sync (unable to communicate) for 10-15 days with your PDC.  When you attempt to make replication from that server to the PDC, you’ll end receiving below error messages: REPADMIN /SHOWREPS, results in error “The target principal name is incorrect.” as shown below: C:\>REPADMIN /SHOWREPSHYD-Network\INDHYD-DC02DSA Options: IS_GCSite Options: IS_GROUP_CACHING_ENABLEDDSA object GUID: 57014cf3-43d0-4f07-8cab-83f0b99o256eDSA invocationID: 1acac066-b749-44fa-b142-9d142e505b55 ==== INBOUND NEIGHBORS ====================================== DC=mylab,DC=lan    US-Network\US-DC01 via RPC        DSA object GUID: f9719614-f32a-4bbd-842a-2fb144f83680        Last attempt @ 2016-06-30 13:15:09 failed, result -2146893022 (0x80090322):           The target principal name is incorrect.        295 consecutive failure(s).        Last success @ 2016-05-27 21:22:30. CN=Configuration,DC=mylab,DC=lan    US-Network\US-DC01 via RPC        […]

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