Backups and CSV : Cluster Hot Fix

If you are like me and have a large number of VM’s on 2008 R2 and Cluster Shared Volumes requiring parrelle backups you should have a look at this hot fix

http://support.microsoft.com/kb/2277439

The Cluster service stops responding if you run backup applications in parallel in Windows Server 2008 R2

hand you have

  • You install the Failover Clustering feature on a computer that is running Windows Server 2008 R2.
  • On this computer, you run some backup applications that use Volume Shadow Copy Service (VSS) in parallel.

The hot fix addresses

This issue occurs because of a race condition between the calls of the VSS writer on the cluster. If an OnBackupShutdown method call occurs between an OnFreeze method call and an OnThaw method call, the lock on the cluster hive is not released. Therefore, a deadlock occurs, and the Cluster service stops responding.

take a look and see if it will help your environment.

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Cluster Shared Volumes and Check Disk

I found this information today and though I should pass it on.

 

For the chkdsk not to run we can run the following commands.

Run the below command on one of the cluster nodes that owns the CSV shared drive:

  • cluster res “CSV_disk_name” /priv
    By default, the value for the DiskRunChkDsk will be 0
  • set the value for DiskRunChkDsk to 4 using the below command:
  • cluster res “CSV_disk_name” /priv DiskRunChkDsk=4
New Chkdsk Functionality

ChkDsk options have been consolidated and expanded from previous versions of clustering to provide greater flexibility. There are now six options for the ChkDsk policy. This policy is enforced when a clustered disk resource is brought online.

The functionality of each policy is described below.

  • DiskRunChkDsk <0x0>: This is the default policy for all Failover Clusters. This policy will check the volume to see if the dirty bit is set and it will perform a Normal check of the file system. The Normal check is similar to running the dir command at the root. If the dirty bit is set or if the Normal check returns a status of FILE_CORRUPT, DISK_CORRUPT, then ChkDsk with be started in Verbose mode (Chkdsk /x /f).
  • DiskRunChkDsk <0x1>: This policy will check the volume to see if the dirty bit is set and it will perform a Verbose check of the file system. The Verbose check is similar to running the dir /s command at the root. If the dirty bit is set or if the Verbose check returns a status of FILE_CORRUPT, DISK_CORRUPT, then ChkDsk with be started in normal mode (Chkdsk /x /f).
  • DiskRunChkDsk <0x2>: This policy will run ChkDsk in Verbose mode (Chkdsk /x /f) on the volume every time it is mounted.
  • DiskRunChkDsk <0x3>: This policy will check the volume to see if the dirty bit is set and it will perform a Normal check of the file system. The Normal check is similar to running the dir command at the root. If the dirty bit is set or if the Normal check returns a status of FILE_CORRUPT, DISK_CORRUPT, then ChkDsk will be started in Verbose mode (Chkdsk /x /f), otherwise ChkDsk will be started in read only mode (Chkdsk without any switches).
  • DiskRunChkDsk <0x4>: This policy doesn’t perform any checks at all.
  • DiskRunChkDsk <0x5>: This policy will check the volume to see if the dirty bit is set and it will perform a Verbose check of the file system. The Verbose check is similar to running the dir /s command at the root. If a problem is found, ChkDsk will not be started and the volume will not be brought online. Modifications to the ChkDsk policy will only be possible from the Cluster.exe command line tools.
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IBM DS3300 or DS3000 Live

I had cluster issue with an iSCSI box today and for everyone else out there, ….the DS3300 is nice but not as full full featured as the 4700….anyways to clea the persistence reservations here is the command

 

right click on the storage sub system and select execute script

 

clear logicalDrive [logicalDriveName] reservations

 

or

 

clear allLogicalDrives reservations

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Earth Quake in Toronto, Prefect Timing as I am performign a mock DR test.

So my Client says at our first DR meeting 3 years ago, but why we never get earth quakes here in Whitby just East of Toronto.

 

But OK lets to DR 3 years later in one of our scheduled DR tests a 5.5 Earthquakes hits…nice timing

 

Thanks Hyper-V you make Easy to do DR.

 

 

 

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BPOS Migration Experience

Well yesterday I performed our internal communication systems which were a mix of hosted exchange and on prem office communicator to Microsoft Online Services with BPOS.

 

I used all of the very cool and well oiled tools……

  • csv files to import all users into the system that wend very smooth
  • migration tool set to migrate form Hosted Exchange & IMAP to BPOS exchange
  • powershell to set mailbox permissions

I have a few disappointments in BPOS but I can;t really complain for the cost of it……..

  • Communicator mobile does not work presently but is rumored to in the future
  • Templates are limited in sharepoint, but you can add in anything to your sites which do note require server side changes.
  • No custom branding on the login screens or sharepoint names

Very cool things……

  • BES is kind of supported……no interface for it but you can get BES support for individual users
  • Signing tool configures everything correctly and works nicely
  • All support has been quick and corrected in a very timely manner
  • and best of all i have a 25G cloud based full exchange mail box now…..nice…..

Now planning for next migration.

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Live Migration – Hyper-V How Many NICs do I need.

I get asked this question a lot by customers and IT Pros alike  I usually answer with well it depends.

And it does depend on what you are doing with your Hyper-V VMs and there storage.

I found a nice link on Microsoft today which give some supported examples for NIC configuration.

 

Host configuration

Virtual machine access

Management

Cluster and Cluster Shared Volumes

Live migration

Comments

4 network adapters with 1 Gbps

Virtual network adapter 1

Network adapter 2

Network adapter 3

Network adapter 4

Recommended

3 network adapters with 1 Gbps; 2 adapters are teamed for link aggregation (private)

Virtual network adapter 1

Virtual network adapter 1 with bandwidth capped at 10%

Network adapter 2 (teamed)

Network adapter 2 with bandwidth capped at 40% (teamed)

Supported

3 network adapters with 1 Gbps

Virtual network adapter 1

Virtual network adapter 1 with bandwidth capped at 10%

Network adapter 2

Network adapter 3

Supported

2 network adapters with 10 Gbps

Virtual network adapter 1

Virtual network adapter 1 with bandwidth capped at 1%

Network adapter 2

Network adapter 2 with bandwidth capped at 50%

Supported*

2 network adapters with 10 Gbps; 1 network adapter with 1 Gbps

Virtual network adapter 1 (10 Gbps)

Network adapter 2 (1 Gbps)

Network adapter 3 (10 Gbps)

Network adapter 2 with bandwidth capped at 50%

Supported

2 network adapters with 10 Gbps; 2 network adapters with 1 Gbps

Virtual network adapter 1 (10 Gbps)

Network adapter 2 (1 Gbps)

Network adapter 3 (1 Gbps)

Network adapter 4 (10 Gbps)

Supported

3 network adapters with 1 Gbps; 2 adapters are teamed for link aggregation (public)

Virtual network adapter 1

Virtual network adapter 1 with bandwidth capped at 5%

Network adapter 2 (teamed)

Network adapter 2 with bandwidth capped at 90% (teamed)

Not recommended

2 network adapters with 1 Gbps

Virtual network adapter 1

Virtual network adapter 1 with bandwidth capped at 10%

Network adapter 2

Network adapter 2 with bandwidth capped at 90%

Not recommended

1 network adapter with 10 Gbps; 1 network adapter with 1 Gbps

Virtual network adapter 1 (10 Gbps)

Virtual network adapter 1 with bandwidth capped at 10%

Network adapter 2 (1 Gbps)

Network adapter 2 with bandwidth capped at 90%

Not recommended

 

http://technet.microsoft.com/en-us/library/ff428137(WS.10).aspx

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EBS – The end of an era…… EBS.Gone

Well Microsoft’s Mid Market Infrastructure solution has been laid to rest.

 

http://blogs.technet.com/essentialbusinessserver/archive/2010/03/05/new-it-trends-bring-change-to-mid-market-product-line.aspx

 

No one saw this coming even the customers and partners involved with the TAP program on EBS.Next well I guess it is will be known as EBS.Gone

 

This is in a move I think to a large picture that will be show to us in the coming moth sand years.

 

I would have thought that SBS would have been dropped and SBS been pushed  to the cloud with BPOS, as move less than 75 user offices could function very well in the cloud with BPOS and not know the difference in fact I would bet that they would see greater uptime and less costs.

 

Here is the official link….. http://www.microsoft.com/ebs/en/us/default.aspx

 

 

 

 

 

 

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