Again, the advice of someone who doesn’t know what he talks about. With that command, you activate the write cache ON THE DISKS, which isn’t protected by anything. It’s stupid to do so. What you want is active the write cache on the CONTROLLER, then configure the cache ratio if necessary. The HP Offline Array Configuration Utility provides an ISO image that can be mounted, burned to a CD/DVD, or flashed to a USB memory key or SD card by using the HP USB Key Utility for Windows. HP utility ISOs such as the HP ProLiant Offline Array Configuration Utility are non-standard format. HP provide a special HP format tool to convert them for use with a single-boot USB drive. The HP Offline Array Configuration Utility provides an ISO image that can be mounted, burned to a CD/DVD, or flashed to a USB memory key or SD card by using the HP USB Key Utility for Windows. It’s sickening how many people give this bad and dangerous advice. The command you need is hpacucli ctrl slot=0 modify nbwc=enable to enable the write cache even if the battery is faulty or not present. It’s dangerous so don’t do it in a production environment unless absolutely necessary. Get a new battery ASAP. And stay away from the drive write cache (dwc). If you have ever looked for a solution to a specific problem or the download page for a certain tool on then you probably know: Searching (and finding) something is a pain on these pages, and the more desperate you need it the longer it will take you. So maybe I will even make a series of 'Hard to find HP tools' posts. Anyway I will start with the Offline ACU tool today. So, what do you need this tool for? I had this challenge before and I reminded that when I came across: Imagine you have an HP based ESXi host with VMs running on local disks attached to a Smart Array RAID Controller. You have run out of disk space and decide to add an additional hard disk to the server. Instead of creating a new (unprotected) RAID volume on this single disk you prefer to expand an existing RAID volume with it. This will give you more disk space and keep the current RAID protection level. How do you do that? Download The Hp Proliant Offline Array Configuration Utility Iso Image From The Hp WebsiteNo problem, if you had Windows (or Linux) running directly on the box, because HP made available the Array Configuration Utility (ACU) for these operating systems. It will allow you to do the RAID expansion online while the OS is running. However, for ESXi this tool is not available as an online version. Update (2013-06-04): Please note that HP also made available hpacucli for ESXi meanwhile. It is included in the HP Offline Bundles and their customized installation images. See and my page. You can still This is why you need to use the Offline ACU tool. This is just a bootable CD with Linux and the Linux ACU tool on it. So, you need to schedule a downtime for the host (and the VMs running on it) and reboot with that CD to make the required changes to your RAID volumes. Not online, but better than nothing. You can find the download link to the current version of the HP ProLiant Offline Array Configuration Utility on my page (in the General section). Once you have successfully expanded your RAID volume (and booted into ESXi again) you just need to do the same with the VMFS datastore that resides on it. Hp Proliant Offline Array Configuration Utility Iso ImagePlease note that since vSphere 4.0 you can grow a VMFS datastore online, and you do not need to use VMFS extents. Choose 'Increase.' From the datastore's properties menu.
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November 2018
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