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Changing Physical Drive Write Cache State to improve performance?

Server-Support
Super Advisor

Changing Physical Drive Write Cache State to improve performance?

People,

I'm having a problem with disk performance in my RAID 5 LUNs below when copying large VM backup files:

 SlowCopy.JPGSlow Copy process

Upon investigating further in SSA, I can see the Physical Drive Write Cache State in all of the Smart Array Controller is not enabled:

 

6 REPLIES
Edwin Eppel
Valued Contributor

Re: Changing Physical Drive Write Cache State to improve performance?

What model server (model and generation)?
Which raid controller card? Firmware version number?
Is the cache module installed on the controller? What size memory?

Dennis Handly
Acclaimed Contributor

Re: Changing Physical Drive Write Cache State to improve performance?

Typically if you don't have those disks on a UPS, if the power goes out, the data in each disk cache is gone.

Server-Support
Super Advisor

Re: Changing Physical Drive Write Cache State to improve performance?

Hi Dennis,

Yes, there is a redundant Power for the DAE and the server.

Does it will improve the transfer speed when I enable it ?

Is there any outage if I enable the option during the business hours ?

Server-Support
Super Advisor

Re: Changing Physical Drive Write Cache State to improve performance?

Hi @Edwin Eppel, the Server is HP DL 385 G7, Storage Controller is P411 with battery.

Dennis Handly
Acclaimed Contributor

Re: Changing Physical Drive Write Cache State to improve performance?

> will it improve the transfer speed when I enable it?

>Is there any outage if I enable the option during the business hours?

 

It should improve the speed until you fill up all the caches, then no benefit.

Since you're copying TB of data, it won't speed it up. Enabling it shouldn't have an outages.

 

>Storage Controller is P411 with battery.

 

This battery is only for the cache in the controller, not the disks.

Server-Support
Super Advisor

Re: Changing Physical Drive Write Cache State to improve performance?

@Dennis Handly thanks for the confirmation.

I will enable it now since it is busines hours I can monitor it.