asked on vmware cloning and Synology CPU I/O Wait
Hello Experts,
Let me show you waht I have in LAB.
2 ESXi host, Synology NAS,
Storage:
A DiskGroup with 2x2TB on top of this a single Volume in RAID-0.
2 x iSCSI LUN (file based): LUN-1 and LUN-2
1x1TB on which a single SHR Volume
1 x iSCSI LUN (file based): LUN-3
Host-A is configured with 2 vSwitch:
Switch1(vmnic0): VMNetwork and Mgmt
Switch2(vmnic3): Storage
Host-B is configured with 2 vSwitch:
Switch1(vmnic0): VMNetwork and Mgmt
Switch2(vmnic5): Storage
All datastore are configured with multiple paths
![paths]()
![LUN-3]()
CASE-1
I have a vm template on LUN-3 and when used to deploy vm from it on LUN-2 or LUN-1 it gets slow gradually.
When checked the under resource monitor
![CPU IOWait]()
![R/W IOPS]()
![Transfer Rate per volume]()
CASE-2
If same thing is performed in reverse i.e., template on LUN-1 or LUN-2 deployed on LUN-3 there is better results.
![CPU IOWait 2]()
![IOPS]()
![Transfer rate]()
What can be the reason for this?
Thanks for the time.
Let me show you waht I have in LAB.
2 ESXi host, Synology NAS,
Storage:
A DiskGroup with 2x2TB on top of this a single Volume in RAID-0.
2 x iSCSI LUN (file based): LUN-1 and LUN-2
1x1TB on which a single SHR Volume
1 x iSCSI LUN (file based): LUN-3
Host-A is configured with 2 vSwitch:
Switch1(vmnic0): VMNetwork and Mgmt
Switch2(vmnic3): Storage
Host-B is configured with 2 vSwitch:
Switch1(vmnic0): VMNetwork and Mgmt
Switch2(vmnic5): Storage
All datastore are configured with multiple paths
CASE-1
I have a vm template on LUN-3 and when used to deploy vm from it on LUN-2 or LUN-1 it gets slow gradually.
When checked the under resource monitor
CASE-2
If same thing is performed in reverse i.e., template on LUN-1 or LUN-2 deployed on LUN-3 there is better results.
What can be the reason for this?
Thanks for the time.
VMwareStorage
Last Comment
Wasim Shaikh
ASKER
Jumbo Frames are enabled on both ends. storage as well as on hosts.
Multipath is configured by using 2 different vswitches and not as showed in your article with single switch and 2 vmk PG. is this approach is incorrect?
![Host Networks]()
![Port Bindings]()
Multipath is configured by using 2 different vswitches and not as showed in your article with single switch and 2 vmk PG. is this approach is incorrect?
ASKER
Both the volumes has VAAI enabled.
am using NFS is for storing ISO files.
am using NFS is for storing ISO files.
Best practice and recommend is as per my EE Article for multipath.
NFS can provide less overhead, than iSCSI.
Why Synology NAS is it, and how many disk bays?
NFS can provide less overhead, than iSCSI.
Why Synology NAS is it, and how many disk bays?
ASKER
Lacking on switch ports, so can't go with recommendations.
Yes, I noted your point from previous post about NFS.
I am moving vms right now and will try using block iSCSI.
Don't know why, may be I like how it sounds iSCSI :-))
Truth is, got this new DS1515 so taking it left and right, coz I need to know how fast it can perform.. at present only 3 HDD are in place.
Yes, I noted your point from previous post about NFS.
I am moving vms right now and will try using block iSCSI.
Don't know why, may be I like how it sounds iSCSI :-))
Truth is, got this new DS1515 so taking it left and right, coz I need to know how fast it can perform.. at present only 3 HDD are in place.
You can increase performance, by installing 2 x SSDS for read and write cache.
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ASKER
Correct, Synology does not enables VAAI (adv feature) unless I don't select Thin Provisioning.
ASKER
By changing the LUN type from thin to block level, I was able to reduce the I/O Wait.
HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client
HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0
Have you tried NFS, and are there any VAAI plugins available for the Synology NAS ?