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Thread: 4 X 120GB EVO Vs 3 EVO's with a WD Green 120GB

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    4 X 120GB EVO Vs 3 EVO's with a WD Green 120GB

    RAID 0...
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    BradC is offline Super Moderator
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    I can't do anything other than a read benchmark on these as they are all in service. Write is a bit slower, but not much.

    3 of these drives have been in use for a few years :
    Code:
    /dev/sds -    INTEL SSDSC2KW256G8    - 0 years 124 days 5 hours
    /dev/sdd -    INTEL SSDSC2CT240A3    - 5 years 278 days 8 hours
    /dev/sdt -    INTEL SSDSC2CT240A3    - 5 years 279 days 18 hours
    /dev/sdc -    INTEL SSDSC2CT240A3    - 5 years 294 days 13 hours
    Oddly enough all 3 of the 330s (240A3) have been in service and switched on for exactly the same period of time, they just have varying levels of clock drift.

    The 4th is a year or so old but it has a firmware bug where the hour counter increments at 1/4 of the real time.

    Code:
    srv:/home/brad# grep ^md5 /proc/mdstat 
    md5 : active raid0 sdc[0] sds[3] sdt[2] sdd[1]
    srv:/home/brad# for i in /dev/sd[cdst] ; do smartctl -i $i | grep "Device Model" ; done 
    Device Model:     INTEL SSDSC2CT240A3
    Device Model:     INTEL SSDSC2CT240A3
    Device Model:     INTEL SSDSC2KW256G8
    Device Model:     INTEL SSDSC2CT240A3
    Code:
    srv:~# dd if=/dev/md5 bs=1M of=/dev/null
    930495+1 records in
    930495+1 records out
    975695249408 bytes (976 GB) copied, 525.909 s, 1.9 GB/s
    For reference, here's a RAID 6 of 8 6TB WD Red drives in the same machine. That's about the equivalent of a RAID 0 of 6 drives. They're not as fast as the 14 x 2TB drives they replaced, but they still saturate the 4 bonded GB network links. Need to upgrade to 10G nics.

    Code:
    srv:/home/brad# dd if=/dev/md0 bs=1G count=128 of=/dev/null
    128+0 records in
    128+0 records out
    137438953472 bytes (137 GB) copied, 270.585 s, 508 MB/s

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