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scottpsy
Contributor
Contributor

Does 'disable ATS' affect storage performance?

I recently had a problem with ESXi, forcing the server to reboot.

I received an answer after VMware SR.

They said storage was under load and that the storage was lock , and so HA is not operated

They said answer is disable ATS.

However, I know that ATS Disable affects storage performance from blog

What is the difference between disable ATS and disable ATS Heartbeat?

What happens when only Disable ATS Heartbeat ?

Storage is EQ6210 (iSCSI).

I don't know if this storage supports ATS or not

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Marmotte94
Enthusiast
Enthusiast

Hi,

You can show more information about your LUNs with this command line from an ESXi. if ATS is supported or not

# esxcli storage vmfs lockmode list

Please, look at this documentation as well : VMFS Locking Mechanisms

Thank you,

Please, visit my blog http://www.purplescreen.eu/
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IRIX201110141
Champion
Champion

The EqualLogic support ATS Locking..

[root@esx-node-97:~] esxcli storage vmfs lockmode list

Volume Name  UUID                                 Type    Locking Mode  ATS Compatible  ATS Upgrade Modes  ATS Incompatibility Reason

-----------  -----------------------------------  ------  ------------  --------------  -----------------  --------------------------

grp-01-001   50018f37-09ffc5fc-dd29-d4ae528ea003  VMFS-5  ATS                     true  No upgrade needed

grp-01-002   500fe112-41f63236-46aa-d4ae528e8772  VMFS-5  ATS                     true  No upgrade needed

grp-01-007   52cbe217-a0892105-f3b4-e0db5515edee  VMFS-5  ATS                     true  No upgrade needed

Its also on the HCL VMware Compatibility Guide - Storage/SAN Search  if you expand your FW level and take a look to VAAI.

Regards

Joerg

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Marmotte94
Enthusiast
Enthusiast

Hi,

ATS is better than ATS+iscsi

You can verify VAAI support with this command :

# esxcli storage core device vaai status get

And which plugin is used with this one

# esxcli storage nmp device list

Be careful if you are in production environment and you would like to change nmp or SATP plugin

Thank you,

Regards,

Please, visit my blog http://www.purplescreen.eu/
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