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Monday, October 22, 2012

Powershell/Veeam Mixed Post

My retention periods are as follows:
Daily VMs: These VMs are servers that have data that changes often. Examples include File servers, SQL Servers, and Mail Servers. I keep four restore points, and these jobs run on M, T, W, and Th. The jobs are daisy-chained using a Powershell script like this:

Add-PsSnapIn VeeamPSSnapIn
get-vbrjob -name "Daily-Web" | start-vbrjob

Upon completion of the last job, the files that compose the Veeam backup job are copied over a WAN link using robocopy to a NAS that I recently acquired. I'm very happy with the NAS! It's an Iomega StorCenter px6-300d that I bought with no drives for $900. Then I bought 6 3TB SATA disks for another $900 or so and arranged them in RAID5. I have around 14TB in usable space for less than 2 grand!!!

Weekly VMs: These are application servers that very rarely change, like terminal servers and print servers. The weekly job also includes all VMs in my "Daily-VM" jobs, so I can save one copy of them every week. This allows me to have grandfather-father-son retention. I save 4 restore points for all of these VMs, and after the job runs I copy the files offsite to the NAS. The challenging part I ran into was working a way for my script to detect that it was the last Friday of the month, and then start the Backup Exec job to also write the Veeam backup files to tape. My first search turned up this Powershell function created by PoSH Pete  called LastXofMonth. I whittled the script down, because I only need to find the last friday, and came up with this:

#Get the date of the last Friday of this month
$Dayname = "Friday"
$LastDayOfMonth = (Get-Date -Year (Get-Date).Year -Month (Get-Date).Month -Day 1).AddMonths(1).AddDays(-1)
If($LastDayOfMonth.DayOfWeek -eq $DayName)
$Answer = $LastDayOfMonth
} #End If
Else {
While($Answer -eq $Null)
$LastDayOfMonth = $LastDayOfMonth.AddDays(-1)
If($LastDayOfMonth.DayOfWeek -eq $DayName)
$Answer = $LastDayOfMonth
} #End If
  }#End While
}#End Else

#Get Today's date and do some date formatting
$Date = ((get-date).ToShortDateString())
$LastFriday = ($

#If Today's date is past or equal to the date of the last friday, start the BE job that writes monthly Veeam backups to tape
If ($Date -ge $LastFriday){
start-process "C:\Program Files\Symantec\Backup Exec\bemcmd.exe" -ArgumentList '-o1 -jCITYBU01 - Veeam to Tape'
} #End If

Something I have forced myself to do with my scripts is to put comments at the end of any command blocks, like If, Else, While, etc. Anywhere that there's code within a set of curly braces that spans more than one line gets a comment. It make nested conditional statements much better to trace out and troubleshoot.
One nice thing I discovered when working with datetime datatypes in this script is that if you take two dates you can compare them. Well, I didn't discover it; it makes sense. I had never done it before and was pleasantly surprised that it worked like I thought it should.

[datetime]$date1 = "11/1/2012"
$date2 = ((get-date).ToShortDateString())
$date1 -gt $date 2

This evaluates as true, because November 1 is "greater than today, which is 10/22/2012.

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