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Cake day: March 23rd, 2025

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  • Could work. I don’t know how your specific SSD handles partitions. Some SSDs don’t care about partitions on the physical level at all. In that case using a partition or unpartitioned space to reserve space to stay empty would work.

    Some SSDs might actually physically reserve space for a partition, in that case leaving something unpartitioned or as an empty partition wouldn’t help.

    I think most SSDs should ignore the partitions on the physical level, so it should work, but no guarantees.


  • The big issue (as the article says) is that TLC/QLC drives have a faster dynamic SLC cache.

    Skip this if you know what the terms mean:

    • SLC (Single Level Cell) means per cell there’s one bit stored
    • MLC (Multi Level Cell): one cell stores 2 bit
    • TLC (Triple Level Cell): 3 bit
    • QLC (Quad Level Cell): 4 bit

    So the more bit per cell, the more storage the drive has, but the slower it is.

    Because of that SSD controllers use part of the free space on a TLC/QLC drive in SLC mode as a fast cache, trading unused storage space for more speed.

    The fuller the drive gets the smaller the cache will be, and on an almost completely full drive there is no cache.


  • It affects them just as much, since LVMs still run on the hardware, so anything on hardware layer will affect the LVM too.

    First, this is mostly only for write speeds. Read speeds aren’t really affected by this.

    So if your 2x512GB are close to full, these will be much slower. If you add a third, that one will be fast. So you’ll still be able to write at about the speed of one drive.

    If you balance the load (which, afaik LVM doesn’t proactively do when you add a new drive), you can get your total speed up by a lot.