max-write-alloc-blocks and when to use it?

mdotten — Wed, 04 Jun 2025 21:06:28 GMT

Hi All,

I'm starting with a bit of a greenfield CDOT system, and have been reading up on some performance tweaks to put in ahead of time prior to this going production... things like zero-block dedupe, scheduling reallocates, etc

The one thing I need help with is I see a few documents telling me to change max-write-alloc-blocks to 256.

Is this a no-brainer change? or are there certain scenarios this could be a hindrance?

This is going to be a dominantly MS-SQL cluster over iSCSI.

Thanks!!

Matt

Re: max-write-alloc-blocks and when to use it?

scottgelb — Fri, 06 May 2016 01:01:21 GMT

I haven't seen a SQL recommendation to modify the default. There are some SAP docs recommending setting to 256 and Exchange to 512 for jetstress. Do you have a support case open? I wouldn't modify without a support recommendation since modifying is not listed in best practice documentation for SQL.

topic max-write-alloc-blocks and when to use it? in ONTAP Hardware

max-write-alloc-blocks and when to use it?

Re: max-write-alloc-blocks and when to use it?