linux-kernel - Re: [dm-devel] RAID4 with no striping mode request

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Message-ID: <0f5aafed-7b1a-99ac-57fc-c5de9a269b92@youngman.org.uk>
Date:   Wed, 15 Feb 2023 14:53:04 +0000
From:   Wols Lists <antlists@...ngman.org.uk>
To:     Roger Heflin <rogerheflin@...il.com>,
        Heinz Mauelshagen <heinzm@...hat.com>
Cc:     Kyle Sanderson <kyle.leet@...il.com>, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>,
        device-mapper development <dm-devel@...hat.com>,
        John Stoffel <john@...ffel.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [dm-devel] RAID4 with no striping mode request

On 15/02/2023 11:44, Roger Heflin wrote:
> WOL: current SSD's are rated for around 1000-2000 writes.  So a 1Tb
> disk can sustain 1000-2000TB of total writes.  And writes to
> filesystem blocks would get re-written more often than data blocks.
>   How well it would work would depend on how often the data is deleted
> and re-written.

When did that guy do that study of SSDs? Basically hammered them to 
death 24/7? I think it took about three years of continuous write/erase 
cycles to destroy them.

Given that most drives are obsolete long before they've had three years 
of writes ... the conclusion was that - for the same write load - 
"modern" (as they were several years ago) SSDs would probably outlast 
mechanical drives for the same workload.

(Cheap SD cards, on the other hand ...)

Cheers,
Wol