Re: [PATCH] bcache: make stripe_size configurable and persistent for hardware raid5/6

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To: Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH] bcache: make stripe_size configurable and persistent for hardware raid5/6
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Sat, 22 Jun 2019 20:41:11 -0400
Cc: Coly Li <colyli@xxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Eric Wheeler <git@xxxxxxxxxxxxxxxxxx>, Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Kent Overstreet <kent.overstreet@xxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx (open list:DOCUMENTATION), linux-kernel@xxxxxxxxxxxxxxx (open list), linux-bcache@xxxxxxxxxxxxxxx (open list:BCACHE (BLOCK LAYER CACHE))
In-reply-to: <1561245371-10235-1-git-send-email-bcache@lists.ewheeler.net> (Eric Wheeler's message of "Sat, 22 Jun 2019 16:16:09 -0700")
Organization: Oracle Corporation
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux)

Eric,

> While some drivers set queue_limits.io_opt (e.g., md raid5), there are
> currently no SCSI/RAID controller drivers that do.

That's not true. Lots of SCSI RAID devices report a stripe width.

-- 
Martin K. Petersen	Oracle Linux Engineering

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References:
- Re: modify stripe_size while running
  - From: Coly Li
- [PATCH] bcache: make stripe_size configurable and persistent for hardware raid5/6
  - From: Eric Wheeler

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