Re: Latest advice on SSD?

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On Tue, Apr 10, 2018 at 12:21 AM, Andreas Joseph Krogh <andreas@xxxxxxxxxx> wrote:
På tirsdag 10. april 2018 kl. 04:36:27, skrev Craig James <cjames@xxxxxxxxxxxxxx>:
One of our four "big iron" (spinning disks) servers went belly up today. (Thanks, Postgres and pgbackrest! Easy recovery.) We're planning to move to a cloud service at the end of the year, so bad timing on this. We didn't want to buy any more hardware, but now it looks like we have to.
 
I followed the discussions about SSD drives when they were first becoming mainstream; at that time, the Intel devices were king. Can anyone recommend what's a good SSD configuration these days? I don't think we want to buy a new server with spinning disks.
 
We're replacing:
  8 core (Intel)
  48GB memory
  12-drive 7200 RPM 500GB
     RAID1 (2 disks, OS and WAL log)
     RAID10 (8 disks, postgres data dir)
     2 spares
  Ubuntu 16.04
  Postgres 9.6
 
The current system peaks at about 7000 TPS from pgbench.
 
With what arguments (also initialization)?


pgbench -i -s 100 -U test
pgbench -U test -c ... -t ...

-c  -t     TPS
5   20000  5202
10  10000  7916
20  5000   7924
30  3333   7270
40  2500   5020
50  2000   6417
 
 
--
Andreas Joseph Krogh
 



--
---------------------------------
Craig A. James
Chief Technology Officer
eMolecules, Inc.
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