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Re: Mixing HDD and SSD in lvm



If you use mdadm for RAID you can mark the slower disk as 'write-mostly' to get more read speed.

On 06.02.24 09:23, Marco Moock wrote:
Am 06.02.2024 um 08:54:18 Uhr schrieb Kamil Jońca:

Marco Moock <mm@dorfdsl.de> writes:

Am 06.02.2024 um 07:17:02 Uhr schrieb Kamil Jońca:
Should I worry about anything (speed differences or sth)?
Speed differences will occur because reading and writing from/to the
SSD will be much faster.
Of course, but can it make any data damage to lvm?

I am asking because some time ago was a (different) story  about SMR
drives whose can make problem when in RAID. And I am wondering if
here I can similar problems.
That was because they have a significant decrease in writing
performance when shingled data needs to be rewritten.
Some RAID controllers treated that as a drive failure.
SSDs normally have a constant write speed, so I don't think this
problem occurs here.



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