Number of parity disks

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To: linux-raid@xxxxxxxxxxxxxxx
Subject: Number of parity disks
From: "Kengo.M" <kengo@xxxxxxxxxxxxxxx>
Date: Sat, 5 Mar 2022 15:09:55 +0900
In-reply-to: <20220305051929.GA24696@lst.de>
References: <20220304175556.407719-1-hch@lst.de> <20220304175556.407719-2-hch@lst.de> <20220304221255.GL3927073@dread.disaster.area> <20220305051929.GA24696@lst.de>

Hi Folks

I use mdadm conveniently.

Let me ask a very very basic question.

One parity disk can be used in RAID 5 and 2 parity disks can be used in RAID 6.
ZFS RAIDZ-3 (raidz3) can use 3 parity disks.

Is it difficult to increase the number of parity disks to 4, 5 or more.

If so, is the reason for this because of the time it takes togenerate the parity bits?


Kengo Miyahara

Follow-Ups:
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References:
- [PATCH 1/2] nvme: remove support or stream based temperature hint
  - From: Christoph Hellwig
- [PATCH 2/2] block: remove the per-bio/request write hint
  - From: Christoph Hellwig
- Re: [PATCH 2/2] block: remove the per-bio/request write hint
  - From: Dave Chinner
- Re: [PATCH 2/2] block: remove the per-bio/request write hint
  - From: Christoph Hellwig

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