VMware Cloud Community
lief91
Contributor
Contributor

Increase size by adding a disk or extend a disk

Hi,

We have a large amount of RedHat VM in our company and we often have to increase the size of them.

Two menansim are possible : extend the disk  or add a disk. The esasier is to add a disk and add to right logical volume, but then we have lot of disk of a sigle VM (like 10 for example). We are wondering about the implication of this, the fact that a VM have lot of disk can it be problematic ?

Thanksfully,

A.

Tags (2)
Reply
0 Kudos
3 Replies
IT_pilot
Expert
Expert

Distribute disks on different iSCSI controllers.

ESXi supports 4 Virtual SCSI adapters per virtual machine.

http://it-pilot.ru
Reply
0 Kudos
lief91
Contributor
Contributor

The performance will be better if i distribute the disks on multiple iSCI controllers ? Because we have no problem until now we are just a bit worried of the possible consequences...

Reply
0 Kudos
IT_pilot
Expert
Expert

Yes.

"It’s also worth noting that you can configure a total of 4 vSCSI adapters per virtual machine.  To provide the best performance, one should also distribute virtual disk across as many vSCSI adapters as possible.  This configuration provides the capability to process more IO simultaneously and benefit from additional queues if necessary."

https://blogs.vmware.com/vsphere/2014/02/vscsi-controller-choose-performance.html

http://it-pilot.ru
Reply
0 Kudos