On Wed, Jul 1, 2015 at 4:56 PM, Andreas Joseph Krogh <andr...@visena.com> wrote:
> På torsdag 02. juli 2015 kl. 01:06:57, skrev Craig James < > cja...@emolecules.com>: > > We're buying a new server in the near future to replace an aging system. > I'd appreciate advice on the best SSD devices and RAID controller cards > available today. > > The database is about 750 GB. This is a "warehouse" server. We load > supplier catalogs throughout a typical work week, then on the weekend > (after Q/A), integrate the new supplier catalogs into our customer-visible > "store", which is then copied to a production server where customers see > it. So the load is mostly data loading, and essentially no OLTP. Typically > there are fewer than a dozen connections to Postgres. > > Linux 2.6.32 > Postgres 9.3 > Hardware: > 2 x INTEL WESTMERE 4C XEON 2.40GHZ > 12GB DDR3 ECC 1333MHz > 3WARE 9650SE-12ML with BBU > 12 x 1TB Hitachi 7200RPM SATA disks > RAID 1 (2 disks) > Linux partition > Swap partition > pg_xlog partition > RAID 10 (8 disks) > Postgres database partition > > We get 5000-7000 TPS from pgbench on this system. > > The new system will have at least as many CPUs, and probably a lot more > memory (196 GB). The database hasn't reached 1TB yet, but we'd like room to > grow, so we'd like a 2TB file system for Postgres. We'll start with the > latest versions of Linux and Postgres. > > Intel's products have always received good reports in this forum. Is that > still the best recommendation? Or are there good alternatives that are > price competitive? > > What about a RAID controller? Are RAID controllers even available for > PCI-Express SSD drives, or do we have to stick with SATA if we need a > battery-backed RAID controller? Or is software RAID sufficient for SSD > drives? > > Are spinning disks still a good choice for the pg_xlog partition and OS? > Is there any reason to get spinning disks at all, or is it better/simpler > to just put everything on SSD drives? > > Thanks in advance for your advice! > > > > Depends on you SSD-drives, but today's enterprise-grade SSD disks can > handle pg_xlog just fine. So I'd go full SSD, unless you have many BLOBs in > pg_largeobject, then move that to a separate tablespace with > "archive-grade"-disks (spinning disks). > No blobs in our database, so that sounds like good advice. It simplifies the hardware a lot if we can go with just SSDs. Craig > > -- > *Andreas Joseph Krogh* > CTO / Partner - Visena AS > Mobile: +47 909 56 963 > andr...@visena.com > www.visena.com > <https://www.visena.com> > > -- --------------------------------- Craig A. James Chief Technology Officer eMolecules, Inc. ---------------------------------
