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Thread: We need an SSD maintenance utility

  1. #21
    Join Date
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    Ubuntu 10.10 Maverick Meerkat

    Re: We need an SSD maintenance utility

    I posted something about SSD endurance here. I am not intending to contradict anything in this thread, in fact I will be bookmarking it because it has collected info on a number of things I was intending to look up and use. I just wish to add a little perspective to the idea that an SSD might wear out through normal use.

    http://openubuntu.com/index.php/topi....html#msg87847
    Michael

  2. #22
    Join Date
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    Ubuntu 13.04 Raring Ringtail

    Re: We need an SSD maintenance utility

    Quote Originally Posted by sudodus View Post
    What about discard=TRIM on an installed portable system on a USB pendrive? Will it make the system significantly slower?
    That won't do anything. TRIM is an ATA command sent from the OS to the drive's on-board electronics. The drive itself does a fair bit of self-management (such as cleanup and wear-levelling), they're quite clever beasties these days.

    USB flash drives lack all these sorts of things. Issuing a TRIM command to them won't do anything.

    By way of analogy a proper SSD is a bit like a high-tech storehouse with it's own fleet of forklifts and in-house inventory system, that you only interact with through a hatch in the wall. The OS requests boxes to come in and out of storage, but doesn't play any part in where or how they're actually stored. Using TRIM would be like stapling a note to every box saying "clean up after moving this box", which the gnomes in the warehouse obey.

    A USB stick is more like a simple set of shelves that you can put boxes on yourself. You can stick as many notes saying "clean up" as you like to the boxes, but there's no one there to do it for you.

  3. #23
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    Ubuntu Development Release

    Re: We need an SSD maintenance utility

    Quote Originally Posted by Paqman View Post
    By way of analogy a proper SSD is a bit like a high-tech storehouse with it's own fleet of forklifts and in-house inventory system, that you only interact with through a hatch in the wall. The OS requests boxes to come in and out of storage, but doesn't play any part in where or how they're actually stored. Using TRIM would be like stapling a note to every box saying "clean up after moving this box", which the gnomes in the warehouse obey.

    A USB stick is more like a simple set of shelves that you can put boxes on yourself. You can stick as many notes saying "clean up" as you like to the boxes, but there's no one there to do it for you.
    Brilliant analogy
    Cheesemill

  4. #24
    Join Date
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    Hidden!

    Re: We need an SSD maintenance utility

    Quote Originally Posted by Paqman View Post
    That won't do anything. TRIM is an ATA command sent from the OS to the drive's on-board electronics. The drive itself does a fair bit of self-management (such as cleanup and wear-levelling), they're quite clever beasties these days.

    USB flash drives lack all these sorts of things. Issuing a TRIM command to them won't do anything.

    By way of analogy a proper SSD is a bit like a high-tech storehouse with it's own fleet of forklifts and in-house inventory system, that you only interact with through a hatch in the wall. The OS requests boxes to come in and out of storage, but doesn't play any part in where or how they're actually stored. Using TRIM would be like stapling a note to every box saying "clean up after moving this box", which the gnomes in the warehouse obey.

    A USB stick is more like a simple set of shelves that you can put boxes on yourself. You can stick as many notes saying "clean up" as you like to the boxes, but there's no one there to do it for you.
    Thank you for the good description

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