Is dedicating 2 drives for WAL too much ? Since my whole raid is comprised of SSD drives, should I just put it in the main pool ?
Sébastien On Wed, Sep 12, 2012 at 8:28 PM, Sébastien Lorion <s...@thestrangefactory.com>wrote: > Ok, make sense .. I will update that as well and report back. Thank you > for your advice. > > Sébastien > > > On Wed, Sep 12, 2012 at 8:04 PM, John R Pierce <pie...@hogranch.com>wrote: > >> On 09/12/12 4:49 PM, Sébastien Lorion wrote: >> >>> You set shared_buffers way below what is suggested in Greg Smith book >>> (25% or more of RAM) .. what is the rationale behind that rule of thumb ? >>> Other values are more or less what I set, though I could lower the >>> effective_cache_size and vfs.zfs.arc_max and see how it goes. >>> >> >> I think those 25% rules were typically created when ram was no more than >> 4-8GB. >> >> for our highly transactional workload, at least, too large of a >> shared_buffers seems to slow us down, perhaps due to higher overhead of >> managing that many 8k buffers. I've heard other read-mostly workloads, >> such as data warehousing, can take advantage of larger buffer counts. >> >> >> >> >> -- >> john r pierce N 37, W 122 >> santa cruz ca mid-left coast >> >> >> >> >> -- >> Sent via pgsql-general mailing list (pgsql-general@postgresql.org) >> To make changes to your subscription: >> http://www.postgresql.org/**mailpref/pgsql-general<http://www.postgresql.org/mailpref/pgsql-general> >> > >
