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However, how you define a “high number” in this context requires that you have a deep understanding for how the underlying volume is created on the SAN. A high number can indicate that there are not enough disk spindles to service the needs of the application or that the existing storage is too slow to keep up with requests. The queue length metric displays the number of outstanding requests (read and write) at any given time. How much disk space is available on the volume? If your users are seeing performance issues, and you’re seeing 100% active times, you might need faster or more disks. If a disk is constantly running at very, very high levels (say, more than 80%), it may point to a storage-related bottleneck. This shows the percentage of time that the disk is not idle and is actively serving requests. Which physical disk is being monitored on this line?
Figure A shows that my Exchange server is seeing 5 and 6 ms response times, so the storage is doing fine as per this metric. At 50 ms and greater, the problem is serious. If you occasionally go beyond 10 ms, you should be okay, but if the system is consistently waiting more than 20 ms for response from the storage, then you may have a problem that needs attention, and it’s likely that users will notice performance degradation. For this metric, a lower number is definitely better in general, anything less than 10 ms is considered good performance.
#Raid monitor task manager full
You’ll notice that you’re pointed to the full path so it’s easy to find the file. The name of the file that is being used by the active process. The green box shows you the current disk I/O (i.e., the amount of data that is being transferred right now), and the blue box lists the highest amount of active time for the disks in the system. To the right side of this section label, you’ll see two quick-glance information boxes.
In particular, the response time metric is probably the most useful metric of the bunch, as it’s directly observable without having to really understand the underlying storage configuration. This section of the Resource Monitor window provides you with more useful troubleshooting information. In Figure A, you can see that the process named DPMRA.exe is doing a ton of reads from the disk. The information you’re provided in this section isn’t particularly useful when troubleshooting except to show you which processes are consuming the most disk performance resources. The average number of bytes accessed per second in the past minute. The average number of bytes written per second by the process in the past minute. The average number of bytes read per second by the process in the past minute. This is useful if you want to use other utilities to manage processes, or if you want to easily match up processes with Task Manager. The ID number associated with the process. This is the name of the process that is actively using the disk. You are shown the name of the executable and a number of performance statistics.
This section of the Resource Monitor window shows you a list of all of the running processes that are using disk resources. I won’t repeat metrics if one type of metric appears in multiple areas, I only list it once. In the sections below, I will provide details for each metric. On the right side of the window are a number of graphs, each depicting a key storage-based performance metric. Occupying most of the window is the statistics area, which I’ll be explaining in depth. Let’s start with an overall look at the console.
#Raid monitor task manager windows
( Note: Like all of our other servers, this server is running as a virtual machine under VMware vSphere 4.1.)įigure A One look at Resource Monitor in Windows Server 2008 R2 (Click the image to enlarge.) This figure shows a Resource Monitor view from a production server running Windows Server 2008 R2 and Exchange Server 2010 with all Exchange roles installed as such, this server has significant need for storage resources that operate within acceptable boundaries. In this installment, I discuss the various disk-related metrics that you can view with Resource Monitor, explain the graphs you see, and provide some context around each metric.įor the purposes of this article, we’ll use the screenshot in Figure A.
#Raid monitor task manager series
In my four-part series about the Resource Monitor, I will focus on each resource monitoring aspect of the tool: CPU, Memory, Disk, and Network. When Microsoft added the comprehensive Resource Monitor tool to Windows, it added an outstanding at-a-glance tool that allows administrators to glean deep intelligence regarding the operating condition of mission critical Windows servers. Scott Lowe gives an overview of the tool's graphics and metrics. The Windows Resource Monitor tool provides very good at-a-glance information about some important disk-based performance metrics. Use Resource Monitor to monitor storage performance
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