From: Shaohua Li <shli@kernel.org>
To: Pawel Baldysiak <pawel.baldysiak@intel.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: [PATCH 0/2] md: Add support for Multiple PPLs
Date: Fri, 25 Aug 2017 14:53:00 -0700 [thread overview]
Message-ID: <20170825215300.xgkdklgi4lxvhxrx@kernel.org> (raw)
In-Reply-To: <c9d77b2c-f1ab-bcce-5441-5b8fa9bede13@intel.com>
On Fri, Aug 25, 2017 at 10:02:07PM +0200, Pawel Baldysiak wrote:
> On 08/21/2017 06:14 PM, Shaohua Li wrote> Can you elaborate more?
> >
> Storage presented to the host may have a RAID on the back-end. For NVMe
> SSDs, the 1.3 specification provided a field to advertise chunk
> boundaries: Identify Namespace NOIOB. We need to span the entire stripe
> to utilize the total available capacity, otherwise we'll repeatedly
> write to only a subset, increasing write amplification factor. The new
> PPL approach is designed to access the full capacity.
Ok, this makes sense. The 1MB area looks arbitrary though. What if the
chunk is 2MB? Could we make it configurable?
Thanks,
Shaohua
next prev parent reply other threads:[~2017-08-25 21:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-16 15:13 [PATCH 0/2] md: Add support for Multiple PPLs Pawel Baldysiak
2017-08-16 15:13 ` [PATCH 1/2] md: Runtime support for multiple ppls Pawel Baldysiak
2017-08-16 15:13 ` [PATCH 2/2] raid5-ppl: Recovery support for multiple partial parity logs Pawel Baldysiak
2017-08-17 18:03 ` [PATCH 0/2] md: Add support for Multiple PPLs Shaohua Li
2017-08-21 14:54 ` Pawel Baldysiak
2017-08-21 16:14 ` Shaohua Li
2017-08-25 20:02 ` Pawel Baldysiak
2017-08-25 21:53 ` Shaohua Li [this message]
2017-08-28 7:44 ` Artur Paszkiewicz
2017-08-28 14:54 ` Shaohua Li
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