topic How the workflow after NVRAM battery failure? in ONTAP Discussions

How the workflow after NVRAM battery failure?

Demon-Huang — Wed, 04 Jun 2025 15:29:49 GMT

Normal Workflow:
1、A client sends in a write request.
2、The data is written into NVRAM.

And now,the controllers NVRAM battery was failure.
How the workflow after NVRAM battery failure?
The write request direct writen into disk?

Re: How the workflow after NVRAM battery failure?

WAYNEWATKINS — Fri, 03 Feb 2017 13:24:07 GMT

Data gets written to system memory and the transactions logged in NVRAM. NVRAM provides battery-backed protection against data loss in disaster situations. Having the data in NVRAM allows the system replay data if lost in system memory before it was flushed to disk. Therefore, losing the battery introduces a risk to losing information in the NVRAM though it would not affect workflow for incoming write requests during normal operation.

Re: How the workflow after NVRAM battery failure?

Demon-Huang — Sat, 04 Feb 2017 13:42:16 GMT

Is there a way to write data directly to disk ?

Re: How the workflow after NVRAM battery failure?

NAYABSK — Sat, 04 Feb 2017 16:33:39 GMT

Hi,

Data ontap is engineered to a procedural write which flows through NV-RAM and there is no way data can be written directly to disks.

Thanks,

Nayab