On Sb, 02 ian 21, 10:05:11, deloptes wrote: > Andrei POPESCU wrote: > > > > The speed gain of SSD vs. spinning discs for the OS is hard to describe. > > Think jet aircraft vs. car. > > > > I've done this for a laptop (partially out of necessity, after I dropped > > it) and it was like buying a new system, even if the processor was > > already significantly outdated at the time (one of the first non-Itanium > > Intel 64 bit processors). > > Yes, but as mentioned the LSI I use in the server are SATA2 so it will stick > to bandwidth throughput of 300MB/s - does it make sense to replace the good > WD RED spinning disks with SSD? Yes. As far as I recall the laptop I mentioned above had SATA I only (definitely at least one SATA generation below the capability of the SSD) and the usability increase was huge. When discussing "OS speed" the important difference between SSDs and HDDs is the random read speed, which is orders of magnitude higher. Just compare for yourself the random read speed of your drives with the theoretical speed of SATA II. Now look at the random read speeds of some consumer SATA drives. Even if the RAID1 helps with random read speeds, a single SSD will run circles around it. Over SATA II. Sequential read / write speed matters only when copying large[1] files around. With smaller file sizes spinning drives waste a lot of time seeking. Add file fragmentation on top. [1] for the purposes of this discussion let's consider "large" files to be files bigger than what your drives can transfer per second in real life, including the seek times. I'm hoping other readers will correct me if my assumption is way of. Kind regards, Andrei -- http://wiki.debian.org/FAQsFromDebianUser
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