Failover problem if raid controller hardware failure

[DIESOFTWARE-RS]

Hello !

We recently experienced the following in our DSSV6/ESX environment:

Primary/active had a raid controller failure,
the controller didn't die completely,
but couldn't write to his volumes anymore.
So logically the iscsi connections were still up,
but all our VMs on our ESX hosts were frozen.

If a volume becomes physically unwritable on primary/active,
we suggested the system to failover to secondary.
Are we wrong ?

Regards
Ralph

[To-M]

This is correct with the new IO Error detection that we have in DSS V6 from release 5626. But unless there was something else that prevented the failover action then we would need to see the log file from both systems to determine why it did not fail over.

[Gr-R]

What version of DSS V6 are you using, and what are your advanced settings in the failover configuration?

[DIESOFTWARE-RS]

Thanks for fast reply !
We are DSSV6 up55 (5087).
So I suppose we should upgrade soon.

Since I'm not allowed to post attachments here, should we open a ticket to send logs ?
But if this is fixed from 5626 we just upgrade to 5845 and we'll be fine next time ?

regards
Ralph

[Gr-R]

update to the latest version, and enable failover on IO errors, and your all set.

[DIESOFTWARE-RS]

Thanks again !

Is it save to upgrade from 5087 directly to 5845 ?

Regards,
Ralph

[Gr-R]

Is it save to upgrade from 5087 directly to 5845 ?

Yes, its safe.
Simply download the latest ISO in your user portal, and upload to the server, and reboot.

[DIESOFTWARE-RS]

Thank You !

Got that update already, we have multiple systems running here,
but they were all updated some time before to up80,
before we went to up90.

I'll give it a try.

Looking to our systems already running on up90,
the failover on I/O errors is already enabled by default
so we don't have to configure this.
Good idea, because we could not configure this anyway,
since for configuration changes we would have to stop failover...

Regards,
Ralph

[Al-S]

The update from build up55.5087 to up90.5845 should be done with no issues.
Just in case if you face any issue with updateing old system to a newer one, you may ask for a small update ( upd_0756 ) from the support team.

[ccrichard]

What raid controller are you using and what firmware version is it at?
I've had lots of issues with previous firmware versions (3.66 and 2.00) for HP Smart Array P410 when using SATA disks.