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Before you proceed ensure that you do not have any snapshots on the VM and the disks are consolidated
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tech53

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There are no snapshots and the option to consolidate disks is greyed out.<br />
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There are 3 vdisks on this VM. &nbsp;208GB, 1.07TB and 150GB. &nbsp;I have been able to add 1GB to disk1 and disk3 but I get the error on disk2 no matter what additional space I add.
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Please check VM Folders, do not reply on checking Snapshot Manager!!!!!<br />
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Have a read of my EE Article<br />
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<a href="https://www.experts-exchange.com/Software/VMWare/A_10300.html" rel="ugc">HOW TO: VMware Snapshots :- Be Patient</a>
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Thanks for the input Andrew. &nbsp;I've checked the vm folder and there are no leftover snapshots files. &nbsp;I've attached a screenshot<a href="https://filedb.experts-exchange.com/incoming/2018/11_w46/1402677/Capture.JPG" target="_blank" title="EXCH1 Folder screenshot (73 KB)"><img alt="EXCH1 Folder screenshot" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2018/11_w46/800_1402677/Capture.JPG" /></a>
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Capture.JPG

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which disk are you trying to extend, and does it state what the maximum size of the disk can be ?
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We run VMware 6.0 on a Cisco UCS host. There are &nbsp;6 X 1.2TB HDD in RAID10 giving 3.4ish TB and we are running low on space on Datastore1. &nbsp;The LSI RAID controller wont let us add disks to the existing RAID so we've created a new RAID1 with 2 x 1.2TB drives. &nbsp;<br />
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Using VCSA, we have moved 3 of our VMs to Datastore2, freeing up 400GB on Datastore1 and now we are trying to extend the size of the virtual disk of our exchange server by 50GB but we get the error<br />
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Insufficient disk space on datastore ''.<br />
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When we look at the error stack we see &quot;The disk extend operation failed: msg.disklib.NOSPACE&quot;<br />
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We cant understand why we are not allow to increase a vdisk when it is reporting that there is more than enough space free. &nbsp;Any help much appreciated.
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We run VMware 6.0 on a Cisco UCS host. There are  6 X 1.2TB HDD in RAID10 giving 3.4ish TB and we are running low on space on Datastore1.  The LSI RAID controller wont let us add disks to the existing RAID so we've created a new RAID1 with 2 x 1.2TB drives.  

Using VCSA, we have moved 3 of our VMs to Datastore2, freeing up 400GB on Datastore1 and now we are trying to extend the size of the virtual disk of our exchange server by 50GB but we get the error

Insufficient disk space on datastore ''.

When we look at the error stack we see "The disk extend operation failed: msg.disklib.NOSPACE"

We cant understand why we are not allow to increase a vdisk when it is reporting that there is more than enough space free.  Any help much appreciated.

Insufficient disk space on datastore

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

Cisco

RAID stands for Redundant Array of Independent Disks.

RAID is data storage technology that allows multiple drives to be used together as a single virtual drive for reasons such as fault tolerance, reliability and performance. 

There are several different levels of RAID that determine how the data is stored and the level of redundancy achieved across the drives.

RAID

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.