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Tim McMichael
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Tim McMichael
Exchange 2010: Page Zeroing and VSS Based Backups
Posted
1 day ago
by
TIMMCMIC
1
Comments
In Exchange Server 2010 Service Pack 1, page zeroing is enabled by default and there is no method to disable it. Page zeroing is a process that takes pages that exist in whitespace within the database and marks them with a pattern of zeros making them...
Tim McMichael
Exchange 2010 Database Availability Groups and Disk Sector Sizes
Posted
28 days ago
by
TIMMCMIC
1
Comments
These days, some customers are deploying Exchange databases and log files on advanced format (4K) drives. Although these drives support a physical sector size of 4096, many vendors are emulating 512 byte sectors in order to maintain backwards compatibility...
Tim McMichael
Exchange 2010: StopDagServerMaintenance.ps1 resets server and database suspension states…
Posted
28 days ago
by
TIMMCMIC
0
Comments
In Exchange 2010, when a database availability group (DAG) member needs service, it can be placed into maintenance mode. To do this, Exchange 2010 includes scripts for this process called StartDagServerMaintenance.ps1 and StopDagServerMaintenace.ps1. ...
Tim McMichael
Part 6: Datacenter Activation Coordination – Who has a say?
Posted
3 months ago
by
TIMMCMIC
4
Comments
I recently worked with a customer that had a three-member database availability group (DAG) that was extended to two sites in a site resilience configuration. During scheduled maintenance in the primary datacenter, the customer encountered an interesting...
Tim McMichael
Part 4: Datacenter Activation Coordination and the Prevention of Split Brain
Posted
3 months ago
by
TIMMCMIC
3
Comments
In Part 1 of this blog post series, I discussed the rules for mounting databases when Datacenter Activation Coordination (DAC) mode is enabled on a Database Availability Group (DAG). In this post, I want to look at the specific scenarios that apply...
Tim McMichael
Part 3: Datacenter Activation Coordination and the Single Node Cluster
Posted
3 months ago
by
TIMMCMIC
2
Comments
In part 2 of this series, I provided a high level overview of how the witness server for a database availability group (DAG) is used with Datacenter Activation Coordination (DAC) mode in the scenario when only a single member remains after a datacenter...
Tim McMichael
Part 5: Datacenter Activation Coordination: How do I force automount consensus?
Posted
3 months ago
by
TIMMCMIC
1
Comments
In order for any database availability group (DAG) that has Datacenter Activation Coordination (DAC) mode to be able to mount any databases, the DAG itself much reach automount consensus. In the following blog posts, I discuss and outline situations where...
Tim McMichael
Exchange 2010: Adding database copies to databases with a single copy results in copy status failed after seeding is completed…
Posted
5 months ago
by
TIMMCMIC
5
Comments
In recent weeks, I’ve worked with customers that have experienced database copies that go into a failed state immediately after adding a copy. In all cases the following circumstances were noted: The database previously only had a single...
Tim McMichael
Another good read on vss backups…
Posted
10 months ago
by
TIMMCMIC
1
Comments
http://blogs.technet.com/b/exchange/archive/2012/06/14/everything-you-need-to-know-about-exchange-backups-part-2.aspx TIMMCMIC
Tim McMichael
A good read on VSS backups…
Posted
11 months ago
by
TIMMCMIC
0
Comments
http://blogs.technet.com/b/exchange/archive/2012/06/04/everything-you-need-to-know-about-exchange-backups-part-1.aspx
Tim McMichael
Exchange 2010: The mystery of the 9223372036854775766 copy queue…
Posted
11 months ago
by
TIMMCMIC
3
Comments
Database Copy Self-Protection Mode What would you say if I told you that a copy queue length (CQL) of 9 quintillion log files was not a bad thing? By the way, if you are wondering, that works out to a CQL of 9,223,372,036,854,775,766, a number...
Tim McMichael
Part 2: Datacenter Activation Coordination and the File Share Witness
Posted
11 months ago
by
TIMMCMIC
5
Comments
In Part 1 of this series, I provided a high level overview of how Datacenter Activation Coordination (DAC) mode works and how the database mount process on startup is affected when DAC mode is enabled. ( http://blogs.technet.com/b/timmcmic/archive...
Tim McMichael
Exchange 2010: Using seedingPostponed results in a seeded database…
Posted
over 1 year ago
by
TIMMCMIC
0
Comments
In Exchange 2010 the add-mailboxdatabasecopy command is utilized to add mailbox database copies to database availability group members. When a copy is first added to a member the database is automatically seeded along with the content index. ...
Tim McMichael
Exchange 2010: Mapping DAG network states to cluster network states…
Posted
over 1 year ago
by
TIMMCMIC
1
Comments
In Exchange 2010 after a Database Availability Group (DAG) is created a series of DAG networks is also created. These DAG networks serve to define how Exchange 2010 servers within the DAG will replicate and seed databases. The initial network...
Tim McMichael
Part 1: My databases do not automatically mount after I enabled Datacenter Activation Coordination
Posted
over 1 year ago
by
TIMMCMIC
8
Comments
Datacenter Activation Coordination (DAC) mode is a property of a Database Availability Group (DAG) that, when enabled, forces starting DAG members to acquire permission in order to mount databases. Administrators can enable DAC mode at any time after...
Tim McMichael
Verifying log file truncation…
Posted
over 1 year ago
by
TIMMCMIC
3
Comments
In support we see cases from customers regarding log file truncation. One question that commonly comes up is how do you verify log file truncation actually occurs? The most common method that administrators use when verifying log file truncation...
Tim McMichael
Backup dates and times are incorrect even though data has been committed to backup media successfully….
Posted
over 1 year ago
by
TIMMCMIC
0
Comments
This week I had a chance to speak with a customer who raised concerns that their backups were completed according to their backup application but Exchange was not showing that a successful full backup had occurred. In this instance, the customer...
Tim McMichael
Backups fail due to consistency check failure…
Posted
over 1 year ago
by
TIMMCMIC
1
Comments
Last week I had the opportunity to work with a customer who was experiencing issues backing up their Exchange 2010 databases. The issue they experienced though is relevant to both Exchange 2007 and Exchange 2003 installations (that leverage VSS...
Tim McMichael
Exchange 2010: Log Truncation and Checkpoint At Log Creation in a Database Availability Group
Posted
over 1 year ago
by
TIMMCMIC
3
Comments
In previous versions of Exchange, when a backup was completed, almost all log files prior to the current log file were truncated from the system. Administrators monitoring the directory would originally see many logs, and post backup note that only...
Tim McMichael
Verifying the file share witness server / directory in use for Exchange 2010
Posted
over 1 year ago
by
TIMMCMIC
1
Comments
If you’ve read my blog post on file share witness oddities you might be asking yourself “how can I actually verify what file share witness is in use in my environment?” There are three different ways to verify the witness in use for Exchange...
Tim McMichael
Exchange and VSS -- My Exchange writer is in a failed retryable state…
Posted
over 1 year ago
by
TIMMCMIC
9
Comments
In Exchange 2007 and Exchange 2010 many customers are leveraging VSS based backups to retain and protect their Exchange data. By default Exchange provides two different VSS writers that share the same VSS writer ID but are loaded by two different...
Tim McMichael
Extra Extra: Recommended hotfix for your dag…
Posted
over 2 years ago
by
TIMMCMIC
1
Comments
http://blogs.technet.com/b/exchange/archive/2011/11/20/recommended-windows-hotfix-for-database-availability-groups-running-windows-server-2008-r2.aspx
Tim McMichael
Exchange 2010: Implementing a dedicated backup network for a Database Availability Group…
Posted
over 2 years ago
by
TIMMCMIC
18
Comments
Occasionally, customers that deploy highly available Mailbox servers use a dedicated or secondary network for backup operations. The way in which you do this in Exchange 2010 has changes, and it’s important that when you implement such a configuration...
Tim McMichael
Exchange 2010: Get-DatabaseAvailabilityGroup does not return all attributes of a DAG
Posted
over 2 years ago
by
TIMMCMIC
3
Comments
When administrators run Get-DatabaseAvailabilityGroup they notice that certain fields within the output are not populated. In some scenarios this leads administrators to attempt to change settings of the DAG or believe that there is an operational...
Tim McMichael
Error–567 ( JET_errDbTimeTooNew )
Posted
over 2 years ago
by
TIMMCMIC
5
Comments
I recently worked with a customer who presented an interesting issue. The customer had installed an Exchange 2007 Cluster Continuous Replication solution where nodes leveraged independent direct attached storage. On the active node of the...
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