functions/Get-DbaIoLatency.ps1

function Get-DbaIoLatency {
    <#
    .SYNOPSIS
        Displays IO subsystem latency statistics from sys.dm_io_virtual_file_stats. Works on SQL Server 2005 and above.
 
    .DESCRIPTION
        This command is based off of Paul Randal's post "Advanced SQL Server performance tuning"
 
        Returns both raw and aggregate information
 
        Reference: https://www.sqlskills.com/blogs/paul/how-to-examine-io-subsystem-latencies-from-within-sql-server/
                    https://www.sqlskills.com/blogs/paul/capturing-io-latencies-period-time/
 
    .PARAMETER SqlInstance
        The SQL Server instance. Server version must be SQL Server version 2008 or higher.
 
    .PARAMETER SqlCredential
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).
 
        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.
 
        For MFA support, please use Connect-DbaInstance.
 
    .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
    .NOTES
        Tags: Diagnostic, IOLatency
        Author: Patrick Flynn (@sqllensman)
 
        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
 
    .LINK
        https://dbatools.io/Get-DbaIoLatency
 
    .EXAMPLE
        PS C:\> Get-DbaIoLatency -SqlInstance sql2008, sqlserver2012
 
        Get IO subsystem latency statistics for servers sql2008 and sqlserver2012.
 
    .EXAMPLE
        PS C:\> $output = Get-DbaIoLatency -SqlInstance sql2008 | Select-Object * | ConvertTo-DbaDataTable
 
        Collects all IO subsystem latency statistics on server sql2008 into a Data Table.
 
    .EXAMPLE
        PS C:\> 'sql2008','sqlserver2012' | Get-DbaIoLatency
 
        Get IO subsystem latency statistics for servers sql2008 and sqlserver2012 via pipline
 
    .EXAMPLE
        PS C:\> $cred = Get-Credential sqladmin
        PS C:\> Get-DbaIoLatency -SqlInstance sql2008 -SqlCredential $cred
 
        Connects using sqladmin credential and returns IO subsystem latency statistics from sql2008
    #>

    [CmdletBinding()]
    Param (
        [parameter(Mandatory, ValueFromPipeline)]
        [DbaInstance[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [switch]$EnableException
    )

    BEGIN {
        $sql = "SELECT
            [vfs].[database_id],
            DB_NAME ([vfs].[database_id]) AS [DatabaseName],
            [vfs].[file_id],
            [mf].[physical_name],
            [num_of_reads],
            [io_stall_read_ms],
            [num_of_writes],
            [io_stall_write_ms],
            [io_stall],
            [num_of_bytes_read],
            [num_of_bytes_written],
            [sample_ms],
            [size_on_disk_bytes],
            [file_handle],
            [ReadLatency] =
            CASE WHEN [num_of_reads] = 0
                THEN 0
                ELSE ([io_stall_read_ms] / [num_of_reads])
            END,
            [WriteLatency] =
                CASE WHEN [num_of_writes] = 0
                    THEN 0
                    ELSE ([io_stall_write_ms] / [num_of_writes])
                END,
            [Latency] =
                CASE WHEN ([num_of_reads] = 0 AND [num_of_writes] = 0)
                    THEN 0
                    ELSE ([io_stall] / ([num_of_reads] + [num_of_writes]))
                END,
            [AvgBPerRead] =
                CASE WHEN [num_of_reads] = 0
                    THEN 0
                    ELSE ([num_of_bytes_read] / [num_of_reads])
                END,
            [AvgBPerWrite] =
                CASE WHEN [num_of_writes] = 0
                    THEN 0
                    ELSE ([num_of_bytes_written] / [num_of_writes])
                END,
            [AvgBPerTransfer] =
                CASE WHEN ([num_of_reads] = 0 AND [num_of_writes] = 0)
                    THEN 0
                    ELSE
                        (([num_of_bytes_read] + [num_of_bytes_written]) /
                        ([num_of_reads] + [num_of_writes]))
                    END
        FROM sys.dm_io_virtual_file_stats (NULL,NULL) AS [vfs]
        INNER JOIN sys.master_files AS [mf]
            ON [vfs].[database_id] = [mf].[database_id]
            AND [vfs].[file_id] = [mf].[file_id];"


        Write-Message -Level Debug -Message $sql

        $excludeColumns = 'FileHandle', 'ReadLatency', 'WriteLatency', 'Latency', 'AvgBPerRead', 'AvgBPerWrite', 'AvgBPerTransfer'
    }
    process {
        if (Test-FunctionInterrupt) { return }
        foreach ($instance in $SqlInstance) {
            try {
                $server = Connect-DbaInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9
            } catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }

            foreach ($row in $server.Query($sql)) {
                [PSCustomObject]@{
                    ComputerName         = $server.ComputerName
                    InstanceName         = $server.ServiceName
                    SqlInstance          = $server.DomainInstanceName
                    DatabaseId           = $row.database_id
                    DatabaseName         = $row.DatabaseName
                    FileId               = $row.file_id
                    PhysicalName         = $row.physical_name
                    NumberOfReads        = $row.num_of_reads
                    IoStallRead          = $row.io_stall_read_ms
                    NumberOfwrites       = $row.num_of_writes
                    IoStallWrite         = $row.io_stall_write_ms
                    IoStall              = $row.io_stall
                    NumberOfBytesRead    = $row.num_of_bytes_read
                    NumberOfBytesWritten = $row.num_of_bytes_written
                    SampleMilliseconds   = $row.sample_ms
                    SizeOnDiskBytes      = $row.size_on_disk_bytes
                    FileHandle           = $row.file_handle
                    ReadLatency          = $row.ReadLatency
                    WriteLatency         = $row.WriteLatency
                    Latency              = $row.Latency
                    AvgBPerRead          = $row.AvgBPerRead
                    AvgBPerWrite         = $row.AvgBPerWrite
                    AvgBPerTransfer      = $row.AvgBPerTransfer
                } | Select-DefaultView -ExcludeProperty $excludeColumns
            }
        }
    }
}
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