Mark, I received yesterday a second server having 16 drives bays. Just for a quick trial, I used 2 old 60GB SSD (a Kingston V300 and a ADATA SP900) to build a RAID0. To my surprise, my very pecky RAID controller (HP P410i) recognised them without a fuss (although as SATAII drives at 3Gb/s. A quick fio benchmark gives me 22000 random 4k read IOPS, more than my 5 146GB 10k SAS disks in RAID0). I moved my most frequently used index to this array and will try to do some benchmarks. Knowing that SSDs based on SandForce-2281 controller are recognised by my server, I may buy a pair of bigger/newer ones to put my tables on.
Thanks! Charles On Sat, Jul 15, 2017 at 1:57 AM, Mark Kirkwood < mark.kirkw...@catalyst.net.nz> wrote: > Thinking about this a bit more - if somewhat more blazing performance is > needed, then this could be achieved via losing the RAID card and spinning > disks altogether and buying 1 of the NVME or SATA solid state products: e.g > > - Samsung 960 Pro or Evo 2 TB (approx 1 or 2 GB/s seq scan speeds and 200K > IOPS) > > - Intel S3610 or similar 1.2 TB (500 MB/s seq scan and 30K IOPS) > > > The Samsung needs an M.2 port on the mobo (but most should have 'em - and > if not PCIe X4 adapter cards are quite cheap). The Intel is a bit more > expensive compared to the Samsung, and is slower but has a longer lifetime. > However for your workload the Sammy is probably fine. > > regards > > Mark > > On 15/07/17 11:09, Mark Kirkwood wrote: > >> Ah yes - that seems more sensible (but still slower than I would expect >> for 5 disks RAID 0). >> > > > > -- > Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance > -- Charles Nadeau Ph.D. http://charlesnadeau.blogspot.com/
