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I am currently running a laptop with 1 HDD and 1SSD.

I currently am using mdadm to put some partitions in a raid 1 configuration with --perfer-write set on the HDD. I have this working correctly however my issue comes with the hard drive spinning down, it never does. I want to be able to run the computer with only the SSD being accessed.

I saw that I can use a write intent bitmap along with deferring writes to allow the HDD to spin down for a while when there is little writing going on however putting this bitmap on the SSD would lead to excess wear along with a performance hit.

I was thinking I could get around this by using an external bitmap and setting it to write to ramfs (arch linux does not have /dev/ram. I am going to test the setup in a VM first but can anyone think of potential implications of this approach?

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  • Potential implications of running the setup in a VM or potential implications of a non-mirrored mirror-raid?
    – Ярослав Рахматуллин
    Commented Jun 25, 2014 at 18:20
  • @ЯрославРахматуллин this was on a laptop. I couldn't end up setting it up for even a test as there was no way to added a write intent bitmap on demand
    – secretformula
    Commented Jun 25, 2014 at 18:33

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