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Disk throughput: Understanding DM writespeed vs SDA

au flag

I am trying to troubleshoot some performance issues.

When i look at my nodeexporter graph, I see numbers i dont understand:

Disk throughput

As I understand, DM-1 is my logical volume, sda is my disk(array).

The write speeds of sda seems within reason for a raid5 of spinny disks, but dm-1 seems like its not possible for that array.

Since the two graphs correlate, is it just an issue of misrepresentation? Netdata monitoring shows same numbers.

Can anyone help explain this behavior?

If relevant, the load shown is git merge conflict check operations, running in a docker container on bare metal.

I sit in a Tesla and translated this thread with Ai:

mangohost

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