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From: Pawel Baldysiak <pawel.baldysiak@intel.com>
To: Shaohua Li <shli@kernel.org>
Cc: linux-raid@vger.kernel.org
Subject: Re: [PATCH 0/2] md: Add support for Multiple PPLs
Date: Fri, 25 Aug 2017 22:02:07 +0200	[thread overview]
Message-ID: <c9d77b2c-f1ab-bcce-5441-5b8fa9bede13@intel.com> (raw)
In-Reply-To: <20170821161426.of5z62r45unlh2en@kernel.org>

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.

Thanks
Pawel

  reply	other threads:[~2017-08-25 20:02 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 [this message]
2017-08-25 21:53         ` Shaohua Li
2017-08-28  7:44           ` Artur Paszkiewicz
2017-08-28 14:54             ` Shaohua Li

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