functions/Test-DbaDiskSpeed.ps1
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function Test-DbaDiskSpeed { <# .SYNOPSIS Tests how disks are performing. .DESCRIPTION Tests how disks are performing. This command uses a query from Rich Benner which was adapted from David Pless's article: https://blogs.msdn.microsoft.com/dpless/2010/12/01/leveraging-sys-dm_io_virtual_file_stats/ https://github.com/RichBenner/PersonalCode/blob/master/Disk_Speed_Check.sql .PARAMETER SqlInstance Allows you to specify a comma separated list of servers to query. .PARAMETER SqlCredential Allows you to login to the SQL Server using alternative credentials. .PARAMETER Database The database(s) to process - this list is auto-populated from the server. If unspecified, all databases will be processed. .PARAMETER ExcludeDatabase The database(s) to exclude - this list is auto-populated from the server .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 Author: Chrissy LeMaire Tags: Performance Website: https://dbatools.io Copyright: (C) Chrissy LeMaire, clemaire@gmail.com License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Test-DbaDiskSpeed .EXAMPLE Test-DbaDiskSpeed -SqlInstance sql2008, sqlserver2012 Tests how disks are performing on sql2008 and sqlserver2012. .EXAMPLE Test-DbaDiskSpeed -SqlInstance sql2008 -Database tempdb Tests how disks storing tempdb files on sql2008 are performing. #> [CmdletBinding()] Param ( [parameter(Position = 0, Mandatory, ValueFromPipeline)] [Alias("ServerInstance", "SqlServer", "SqlServers")] [DbaInstance[]]$SqlInstance, [PSCredential]$SqlCredential, [Alias("Databases")] [object[]]$Database, [object[]]$ExcludeDatabase, [switch]$EnableException ) begin { $sql = "SELECT SERVERPROPERTY('MachineName') AS ComputerName, ISNULL(SERVERPROPERTY('InstanceName'), 'MSSQLSERVER') AS InstanceName, SERVERPROPERTY('ServerName') AS SqlInstance, db_name(a.database_id) AS [Database] , CAST(((a.size_on_disk_bytes/1024)/1024.0)/1024 AS DECIMAL(10,2)) AS [SizeGB] , RIGHT(b.physical_name, CHARINDEX('\', REVERSE(b.physical_name)) -1) AS [FileName] , a.file_id AS [FileID] , CASE WHEN a.file_id = 2 THEN 'Log' ELSE 'Data' END AS [FileType] , UPPER(SUBSTRING(b.physical_name, 1, 2)) AS [DiskLocation] , a.num_of_reads AS [Reads] , CASE WHEN a.num_of_reads < 1 THEN NULL ELSE CAST(a.io_stall_read_ms/(a.num_of_reads) AS INT) END AS [AverageReadStall] , CASE WHEN CASE WHEN a.num_of_reads < 1 THEN NULL ELSE CAST(a.io_stall_read_ms/(a.num_of_reads) AS INT) END < 10 THEN 'Very Good' WHEN CASE WHEN a.num_of_reads < 1 THEN NULL ELSE CAST(a.io_stall_read_ms/(a.num_of_reads) AS INT) END < 20 THEN 'OK' WHEN CASE WHEN a.num_of_reads < 1 THEN NULL ELSE CAST(a.io_stall_read_ms/(a.num_of_reads) AS INT) END < 50 THEN 'Slow, Needs Attention' WHEN CASE WHEN a.num_of_reads < 1 THEN NULL ELSE CAST(a.io_stall_read_ms/(a.num_of_reads) AS INT) END >= 50 THEN 'Serious I/O Bottleneck' END AS [ReadPerformance] , a.num_of_writes AS [Writes] , CASE WHEN a.num_of_writes < 1 THEN NULL ELSE CAST(a.io_stall_write_ms/a.num_of_writes AS INT) END AS [AverageWriteStall] , CASE WHEN CASE WHEN a.num_of_writes < 1 THEN NULL ELSE CAST(a.io_stall_write_ms/(a.num_of_writes) AS INT) END < 10 THEN 'Very Good' WHEN CASE WHEN a.num_of_writes < 1 THEN NULL ELSE CAST(a.io_stall_write_ms/(a.num_of_writes) AS INT) END < 20 THEN 'OK' WHEN CASE WHEN a.num_of_writes < 1 THEN NULL ELSE CAST(a.io_stall_write_ms/(a.num_of_writes) AS INT) END < 50 THEN 'Slow, Needs Attention' WHEN CASE WHEN a.num_of_writes < 1 THEN NULL ELSE CAST(a.io_stall_write_ms/(a.num_of_writes) AS INT) END >= 50 THEN 'Serious I/O Bottleneck' END AS [WritePerformance] FROM sys.dm_io_virtual_file_stats (NULL, NULL) a JOIN sys.master_files b ON a.file_id = b.file_id AND a.database_id = b.database_id" if ($Database -or $ExcludeDatabase) { if ($database) { $where = " where db_name(a.database_id) in ('$($Database -join "'")') " } if ($ExcludeDatabase) { $where = " where db_name(a.database_id) not in ('$($ExcludeDatabase -join "'")') " } $sql += $where } $sql += " ORDER BY (a.num_of_reads + a.num_of_writes) DESC" } process { foreach ($instance in $SqlInstance) { Write-Message -Level Verbose -Message "Connecting to $instance" try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9 } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } Write-Message -Level Debug -Message "Executing $sql" $server.Query("$sql") } } } |