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Fragging wonderful: The truth about defragging your SSD

  1. #21

    Which is not what I am talking about. I am addressing storage capacity as still being an issue.

    Defrag stuff apart.

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  2. #22

    Posts : 87
    Windows 7 Pro 64

    Quote Originally Posted by Coram Daes;288892[B
    Because SSD are not mainstream yet.[/B] To me, SSD is still a new technology, emerging in usage as prices for the drives goes down. There is still too much of a price difference for server drives and desktop drives with higher storage volumes in order to start yelling about mainstream.
    They are pretty much mainstream for OS. $100 gives you all you need. For data you use a spinner, and with W7/8 defragmentation is not a noticeable issue anymore.

    About 3 years ago viable and inexpensive SSD were available, which is ages in computer-time.

    And even for someone who doesn't want to afford one, the fact that defragging is not needed is general knowledge, and has been to anyoen just reading about SSD in the past 3 years.
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  3. #23

    I agree that the OS may reside on an SSD and gain performance by it. I also agree that the SSD capacity and price is not really an issue when we are talking about OS allocation. Today.

    I do NOT agree SSD's were cheap even three years ago. I do NOT agree that the knowledge about not having to defrag SSD's was common spread three years ago, and hence I do NOT agree to most of what you write, also in a pretty condescending tone.

    Anyone can claim "hey we all knew that" without being able to present any facts to the matter. I do not.

    I am ALSO saying that optimizing SSD's is a technology that may or may not hit the market, depending on if research may find a way to do so. That is beyond any of us, but we already see a valid tech in use for optimizing SSD storage, the one mentioned earlier, TRIM. I am not saying that is defrag, as we interprete it historically, I am only saying it is some kind of optimization. That is undeniable.

    Also, what you seem to forget is that with any computer that have several drives attached to it, the overall performance of that computer is not deemed by the OS boot time alone, or of the R/W operations on the OS disk, but of the disk access needed for the computer/server in question to perform its role. In that case you may very well have an SSD as OS disk, but SAS or SATA drives as storage/work space and the overall speed of the computer will not be largely enhanced, only because the OS resides on an SSD.
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  4. #24

    Hafnarfjörður IS
    Posts : 4,374
    Linux Centos 7, W8.1, W7, W2K3 Server W10

    Hi there
    I posted some issues on how the I/O actually works on OS'es like windows - if one reads this then the whole concept of "Long File chains" etc are essentially irrelevant to the whole issue -- anyway just to re-iterate.

    Most modern OS'es - especially Apple Ios, Windows 7 / 8 / 8.1 the actual I/O is performed where possible ASYNCHRONOUSLY with your work. The OS'es use a complex algorithm (which is optimized the more you use the OS) known as PRE-FETCHING.

    What this means in plain English is that the OS can make a pretty good guess as to what data you are likely to use next and for example while you might be typing a reply to the Forum the Pre-fetch routine has already retrieved some data and stored it in the Disk Cache so when you need it the I/O doesn't need to be done as the data is already available.

    These algorithms while complex are usually pretty good and this is where the design of the Disk is important -- the size of the CACHE needs to be large enough so the OS can PREFETCH a reasonable amount of data whith a good probability of getting a good hit -- I.e it has made a decent guess.

    Going into complex statistical analysis here is way beyond the scope of this post - but these algorithms are pretty smart these days.

    Particularly in the case of things like OS'es -- where the main data doesn't actually change too much -- the non persistent data like work areas and page data don't need to be saved permanently on Disk at all.

    DEFRAG for an OS -- especially where the OS has been moved to it's own partition isn't really necessary AT ALL - and hasn't been for a long time -- assuming you have decent spinners and the disk has a decent cache. Any 7200 RPM disk is probably OK to ignore defragging.

    5400 RPM disks are usually JUNK anyway so even if you DID defrag them you would still be twiddling your thumbs waiting for I/O most of the time. These disks should you still be unfortunate enough to have any are best left for data that's usually only READ like multi-media files or backup / archive.

    SSD's are different and having no mechanical parts can react a lot quicker -- PREFETCH is still worth while on these but data access is an order of magnitude faster so they can operate with smaller caches - to make them cheaper.

    There's a whole slew in this issue which consists of more than just "Long file chains". - I wonder if the makers of these products actually understand how the OS actually works.

    The best you can do for any system is to PUT THE FASTEST DISKS INTO THEM. Slow I/O will kill any system stone dead - even if you have an I7 processor.

    Anyway my last word on this - I can honestly say I don't think I've EVER noticed a miniscule of improvement after defragging a disk -- replacing a slow one with a faster one with a bigger cache -- that's another story - and an SSD is best of all.

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  5. #25

    Posts : 1,339
    Windows 8.1 Pro x64 bit

    Anyway my last word on this - I can honestly say I don't think I've EVER noticed a miniscule of improvement after defragging a disk -- replacing a slow one with a faster one with a bigger cache -- that's another story - and an SSD is best of all.

    I'll second that.
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  6. #26

    Posts : 87
    Windows 7 Pro 64

    Jimbo45: excellent analysis and explanation!
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  7. #27

    Orbiting the Moon
    Posts : 2,972
    Windows 10 x64

    For speed improvement, Defragging was useful on Win98, on fat32. Since ntfs, defragmenting didn't gave a significant boost anymore.

    I never defragged on 7200rpm spinners for speed and now there's no way I'm defragging on SSD.

    The only time I find defragmenting useful (for spinners only, but might apply for SSD as well) is when you want to shrink down a partition but it's not giving enough space for this because of fragmentation (files chunks are spread up to the end of disk). You most likely need to defrag the disk first. If you use one or two good programs (some like the free Defraggler) that also give the names of the files needed to defrag, you can get there copy/move or delete the files: pagefile.sys cannot be defragged because is unmovable so you might wanna disable it first (even delete it manually afterwards), defrag the disk now, shrink down the partition after defrag, when all is good and then re-enable the pagefile again. There are cases when this steps are required, if you have small and/or full disks. Usually if there's enough space on the disk, you will be able to shrink the partition enough without defragmenting, but again, hopefully there are no pagefile pieces in the way of the shrink operation.

    On a daily usage, no defrag is really required, if the disk has very large files stored then there's a higher chance for those to be fragmeneted (split into smaller pieces) of course.
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  8. #28

    Posts : 1,338
    Windows 7 Ultimate SP1 (64 bit), Linux Mint 17.1 MATE (64 bit)

    I used to find that XP ran better if it was properly defragged.

    I can't say that I notice any real performance improvement in W7 after defragging.
    It might shave a few milliseconds off of operations (thus unnoticeable).
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  9. #29

    I am not even sure we are talking about the same basic tech anymore.

    Granted Jimbos post makes a lot of sense from that perspective, but is not really what I was addressing or responding to.
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  10. #30

    It certainly has been common knowledge that you do not need to defrag an ssd for years. Just because you didn't know that doesn't change the facts.

    Trim is not anything like defrag, neither is GC. Both trim and GC are run at the controller level and require no input from the user.

    There is no need to "optimize" any modern ssd. They are plug and play, just like any spinner drive.
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