HPE EVA Storage

EVA controller resync

 
Gordon Bloxham
Advisor

EVA controller resync

Does anyone know how long it takes an EVA controller to resync. I am trying to find out how long an 8100 takes and how long an 8400 takes
13 REPLIES 13
Niels Vejrup Pedersen
Respected Contributor

Re: EVA controller resync

Usually a controller resync takes less than 15 seconds. (when doing upgrades hp calculated with 30 seconds for the resync process after a controller reboot)

I can't find any written info on this, it's just what i've been told from hp.

Regards
Gordon Bloxham
Advisor

Re: EVA controller resync

The reason I ask this is that we have set scsi timeouts to 60 seconds and resyncs sometimes have been taking longer. I am interested to see what everyone else has been told.
Niels Vejrup Pedersen
Respected Contributor

Re: EVA controller resync

60 seconds are also usually sufficient depending on the TB in your EVA.

There will be improvements since newer EVA's with more disks, and larger disks will require more time reading the metadata - but in future XCS version on the x400 series there will be improvements not needing to read the metadata from disk, but having it in policy memory through the reboot of the controllers.

Since 2006 HP has done a really good work in their online upgrades, so i would not be too worried about OS timeouts - IF set to 60 seconds.

But as always please do a performance analysis of the EVA before upgrading - there is a semi automatic tool for this now - the Upgrade Advisor.

Regards
IBaltay
Honored Contributor

Re: EVA controller resync

Hi,
this is an older document
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00795548/c00795548.pdf

newer document for EVA 44xx/64xx/84xx (page 31)
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01680630/c01680630.pdf

Selecting an appropriate time to perform an online upgrade
To ensure the success of an online upgrade, selecting the appropriate time is essential. Because the
online firmware upgrade is performed while host I/Os are being serviced, the I/O load can impact
the upgrade process. Selecting a period of low I/O activity will ensure the upgrade completes as
quickly as possible, and will avoid disruptions to host and applications due to timeouts.
While there are advantages to performing an online upgrade, there are circumstances when it is not
advisable. Therefore, give careful consideration to the circumstances of your configuration and your
application deployment before making an attempt to do an online upgrade.

There is a section for
Managing host I/O timeouts for an online upgrade here

the pain is one part of the reality
Chris Callihan_1
Frequent Advisor

Re: EVA controller resync

HP has a tool called the EVA Upgrade Schedule Advisor

HP StorageWorks EVA Upgrade Scheduling Advisor (EVA Upgrade Scheduling Advisor) software enables you to monitor and analyze the I/O load on the EVA storage system. It suggests the timelines to perform an EVA firmware upgrade through an easy-to-use GUI. EVA Upgrade Scheduling Advisor also allows you to set and restore the recommended SCSI driver timeout values (as described in the EVA online firmware upgrade best practices guide) for Windows hosts.

- check with you local team to see if they can assist you with this tool
Del_3
Trusted Contributor

Re: EVA controller resync

Maybe there is something I dont understand here but seems the OS is only secondary to the application. So if your app - SQL, Oracle or the worst - Exchange, times out before 60 seconds the online update will cause application problems.

Please set me straight.

Niels Vejrup Pedersen
Respected Contributor

Re: EVA controller resync

Hello,

You right - Application timeouts also need to be taken care of.

Regards,
Gordon Bloxham
Advisor

Re: EVA controller resync

The think that is issing is that I no resyncs are taking longer than 60 seconds. I jus wantedto find out everyone elses experience of this.
Vinod Kumar Yadav
Trusted Contributor

Re: EVA controller resync

Hi,

The HP EVA Controller Resync will take max time to sync between 60 second usually.


Other wise just check in the HP Command EVA SMA Server status of the both controller.

If it is showing any yellow alert sign at controller A & B.


Then Check the log of command view EVA
for more information.


Thanks
Vinod Kumar Yadav



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