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Datastores-VMFSRSS

VMware VMFS Datastore resources

Using esxcli in vSphere 5.5 to reclaim VMFS deleted blocks on thin-provisioned LUNs (2057513)

vSphere 5.5 introduces a new command in the esxcli namespace that allows deleted blocks to be reclaimed on thin provisioned LUNs that support the VAAI UNMAP primitive.The command can be run without any maintenance window, and the reclaim mechanism has bee ...
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partedUtil and vmkfstools in 5.1

The following examples show how to use partedUtil and vmkfstools to perform vmfs related operations in 5x.  I started with two disks (each 8gbs) and followed the lab shown in the Install Configure Manage class that Vmware offers. The goal was never t ...
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Finding the Datastore to a Given LUN Canonical Name

During the VMware vSphere Optimize & Scale class you often get confronted with the situation that you see some high latencies on certain LUNs. But how can we find the datastore to that LUN’s canonical name? Unfortunately, from resxtop you only get th ...
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PowerCLI Datastore Migration Script

The following script will accept a vCenter and two datastores as input, and move VMs from the source to the destination one at a time. The requirement for this script was to perform the migration without babysitting, but to not overwhelm the sto ...
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Growing a local datastore from the command line in vSphere ESXi 4.x and 5.x (2002461)

VMFS Datastores in vSphere 4.x and 5.x can be increased in size by adding a new extent on a different storage device (spanning), or by increasing the size of the existing storage device and then growing the existing datastore extent to fill that available ...
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8 weeks of #VCAP – LUN Masking (mwpreston dot net)

Alright – here we go – the push is on.  8 weeks to cover some random, sparingly used topics off of the VCAP5-DCA blueprint.  Today, let's tackle an item out of the very first objective on the blueprint; LUN masking. LUN masking is essentially a ...
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Getting Started with vSphere PowerCLI: PSDrives

We're back with our multi-part series on VMware's vSphere PowerCLI, a free snapin you can use to manage your VMware infrastructure. In part one, we took a look at downloading and installing PowerCLI. In part two, we went through the steps of setting up an ...
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vSphere Sizing Formula – Storage & Datastores

This blog post continues on from my previous blog post on vSphere Sizing Formula – CPU & RAM, this is again for me to share with you my methodology when it comes to sizing the requirements for a storage design. I’m not going to go into specific stora ...
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Using the partedUtil command line utility on ESXi and ESX (1036609)

If you specify an incorrect GUID size using the partedUtil command, you may see errors similar to: error: "Invalid guid (0xfb). Contains non-hexadecimal digits Invalid guid (fb). Length should be 32 Invalid guid (251). Length should be 32

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Thin Provisioned LUNs with TPSTUN and TPST

Thin provisioned LUNs have been a problem for a long time with vSphere. Allowing overcommitment of storage capacity on the storage array, you have to keep in mind that the LUN will grow creating a new VM but not shrink deleting one. As a result, the LUN w ...
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vSphere Basics: Correctly decommissioning a vSphere Datastore (Simon Eady)

You’d be surprised how many times I see datastore that’s just been un-presented from hosts rather than decommissioned correctly – in one notable case I saw a distributed switch crippled for a whole cluster because the datastore in question was being used ...
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Keeping VMFS datastores thin on 3PAR StoreServ

Earlier this year, I moved a large part of my infrastructure onto HP’s 3PAR StoreServ 7400.  As promised, our initial migration netted us over 50% savings through the thin technologies baked into the 3PAR StoreServ platform.  But one my biggest ...
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Why is uploading files to VMFS so slow?

This is something which can come up numerous times, and behavior which many of you have observed. There seems to be some issue with uploading files to a VMFS datastore. In fact, in one example, we had someone report that it took 10 minutes to upload a Win ...
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Using vmkfstools to reclaim VMFS deleted blocks on thin-provisioned LUNs (2014849)

vSphere 5.0 introduced the VAAI Thin Provisioning Block Space Reclamation (UNMAP) Primitive. This feature was designed to efficiently reclaim deleted space to meet continuing storage needs. ESXi 5.0 issues UNMAP commands for space reclamation during sever ...
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Quick Tip - Correlating VMFS Datastore to Storage Device Using ESXCLI

There was a question on Twitter this morning from AJ Kuftic on whether it is possible to display the mapping of a VMFS Datastore to its respective storage device using ESXCLI. Josh Coen beat me to the answer this morning, but yes it is possible using ESXC ...
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Using vSphere On-disk Metadata Analyzer (VOMA) to check VMFS metadata consistency (2036767)

This article provides instructions to perform a file system metadata check.Some examples of when a file system metadata check is necessary include: SAN outage Rebuilt RAID Disk replacement Reports of metadata errors in the vmkernel.logfile Unable t ...
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Frequently Asked Questions on VMware vSphere 5.x for VMFS-5 (2003813)

This article provides information on the new VMFS-5 filesystem in vSphere 5.x, as well as details regarding troubleshooting the upgrade between VMFS-3 and VMFS-5.

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Heads Up! Cannot Enable SIOC on NFS Datastores

This is an interesting one for those of you considering using Storage I/O Control (SIOC) on NFS datastores. We’ve come across an issue a couple of times whereby SIOC fails to enable on an NFS datastore due to a permissions issue. The following messages ar ...
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