On 01/09/14 17:10, Alexandre DERUMIER wrote: >>> Allegedly this model ssd (128G m550) can do 75K 4k random write IOPS >>> (running fio on the filesystem I've seen 70K IOPS so is reasonably >>> believable). So anyway we are not getting anywhere near the max IOPS >> >from our devices. > > Hi, > Just check this: > > http://www.anandtech.com/show/7864/crucial-m550-review-128gb-256gb-512gb-and-1tb-models-tested/3 > > > If the ssd is full of datas, the performance is far from 75K, more around 7K. > > I think only high-end DC ssd, slc, can provide consistent results around 40K-50K > Exactly - I'm not (meaning to anyway) recommend the M550 in a serious datacenter situation - performance is not consistent enough as you mention, and also their wearout lifetime is a bit short for a serious continued workload (we use the Intel DC S3700 for production). However on the plus side the M550 *does* have power loss protection via caps - which is awesome in a budget product, so *may* be suitable for lightly loaded server scenario if you understand its limitations. Also they are very useful for fact finding and debugging in a workstation environment (which is how I'm using them)! Regards Mark
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