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SSD for Squid cache ?

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  • G
    goodspeed_11
    last edited by Apr 13, 2015, 7:50 AM

    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

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    • K
      kejianshi
      last edited by Apr 13, 2015, 7:59 AM

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

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      • ?
        Guest
        last edited by Apr 13, 2015, 8:14 AM

        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
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        • G
          goodspeed_11
          last edited by Apr 13, 2015, 8:54 AM

          Thanks for your COMPLETE reply !

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

          Best regards

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          • R
            rjcrowder
            last edited by Apr 13, 2015, 2:16 PM

            @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.

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            • K
              kejianshi
              last edited by Apr 13, 2015, 2:19 PM

              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.

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              • ?
                Guest
                last edited by Apr 13, 2015, 4:11 PM

                @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

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                • C
                  croak
                  last edited by Apr 13, 2015, 9:26 PM Apr 13, 2015, 9:16 PM

                  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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