Scott Carey wrote: > Don't ever have WAL and data on the same OS volume as ext3. > > If data=writeback, performance will be fine, data integrity will be ok > for WAL, but data integrity will not be sufficient for the data > partition. If data=ordered, performance will be very bad, but data > integrity will be OK. > > This is because an fsync on ext3 flushes _all dirty pages in the file > system_ to disk, not just those for the file being fsync'd. > > One partition for WAL, one for data. If using ext3 this is essentially > a performance requirement no matter how your array is set up underneath. Do we need to document this? -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
