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

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Message-ID: <yq1v9wxnnfc.fsf@oracle.com>
Date:   Sat, 22 Jun 2019 20:41:11 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Eric Wheeler <bcache@...ts.ewheeler.net>
Cc:     Coly Li <colyli@...e.de>, linux-block@...r.kernel.org,
        Eric Wheeler <git@...ux.ewheeler.net>,
        Eric Wheeler <bcache@...ux.ewheeler.net>,
        Jonathan Corbet <corbet@....net>,
        Kent Overstreet <kent.overstreet@...il.com>,
        linux-doc@...r.kernel.org (open list:DOCUMENTATION),
        linux-kernel@...r.kernel.org (open list),
        linux-bcache@...r.kernel.org (open list:BCACHE (BLOCK LAYER CACHE))
Subject: Re: [PATCH] bcache: make stripe_size configurable and persistent for hardware raid5/6


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