Re: How to salvage a degraded mdadm RAID1 with as little data loss? as possible?

Robert Heller <[email protected]> Sat, 20 Jun 2026 16:26:59 -0400 (EDT)

Newsgroups	gmane.linux.debian.user
Organization	Deepwoods Software
Message-ID	<[email protected]>

At Sat, 20 Jun 2026 21:01:32 +0100 [email protected] wrote:

> 
> David Christensen <[email protected]> wrote:
> > AIUI neither XFS nor mdadm compute, store, or verify checksums of
> > data or metadata on disk.
> 
> XFS checksums metadata for many years now (12?), but it doesn't checksum
> user data.

I've always thought that the hardware controller checksums raw disk blocks
(sectors) as part of the low-level I/O processing in the controller hardware's
"firmware" and that this is how the controller knows it has a bad block.

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