SSD for Squid cache ?



  • Hi,

    I'm in internship and I would know if it's not good to take an SSD for squid cache.
    My company would like to use an SSD samsung EVO 500Gb

    What do you think about that, especially on the life duration ??? cycle count

    Thks



  • Sure - SSDs seem to work pretty well now for SQUID..



  • What do you think about that, especially on the life duration ??? cycle count

    I would have a look to the Samsung840 Pro series, related to the firmware problems
    with the Samsung850 and especially the EVO series.

    And take a bigger one likes 256 GG or 512 GB if you are able to get your hands on.
    Because the wear leveling algorithm is choosing even other free blocks or clusters
    on this SSD disks to use them all and not even some of them to gain the life duration
    so a bigger model will also be coming with a longer lifetime in theoretical.

    And at second the SSD SATA controller on the SSD disk is using even some space from the entire
    SSD disk as a cache, so if the SSD is bigger, it can take more space as cache and the same model
    will be owning more cache;

    • 64 GB = 4 GB as cache
    • 128 GB = 8 GB as cache
    • 256 GB = 16 GB as cache
    • 512 GB = 32 GB as cache


  • Thanks for your COMPLETE reply !

    I'm enable to take a 512Gb :)
    So I will take one

    Best regards



  • @goodspeed_11:

    What do you think about that, especially on the life duration ??? cycle count

    I've had great luck with the 840 pro and an Intel (can't remember the model).

    Don't even think about getting cheap SSD's for high volume hits (i.e. squid cache) - I keep trying and they keep dieing.



  • Yeah - For serious work to death situations, there is simply no substitute for SLC ssd, which costs a fortune BTW.

    But the pro version that was recommended has a good track record.



  • @goodspeed_11

    I was not really reading the entire text or I was misunderstood something of your opening text:

    My company would like to use an SSD samsung EVO 500Gb

    If this is a very small company you can surely go with the Samsung840 Pro 512 GB
    but for a greater Company I would also go with the by @kejianshi recommended SLC SSD
    related to the entire life time and saturation and other benefits of those SLC SSDs.

    I was suggesting the Samsung840 pro series because I am using them it selfs and
    owed to this report. The SSD Endurance Experiment



  • It depends on your budget.

    The Samsung EVO series don't have a TBW spec, but our long term endurance testing has shown that they fail much earlier than the Samsung PRO series.  There's a very clear difference between TLC and MLC - we have a couple of 840 Pro SSDs that have exceeded 1.5 petabytes and still going, and I've seen reports of some with over 2 petabytes.  The difference in cost is a couple of hundred dollars between the 850 EVO and 850 PRO which I think is well worth it.

    However, I would suggest you look at the Intel 750 Series NVMe PCIe SSDs.  NVMe SSD storage is substantially faster than SATA based SSDs, running around 2.4GB/s read speed, 1.2 GB/s write speed, with around 400K+ IOPS on random writes.  The 400GB version is around $500 and the 1200GB version is $1200, as I recall.

    Unlike the Intel P3700 series which is intended for data center use, the 750 series is intended for enthusiast/professional users.  I've been stress testing a couple of 1200GB drives in a lab for a couple of weeks, and based on the early results I think we'll be ordering a lot of them.


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