Humm sorry, I did a mistake 2011/11/15 Jean-Armel Luce <jaluc...@gmail.com>
> Sorry to be so long to answer :-( > - How large is the db? By which I mean how much disk space does the > data directory occupy? > 100 GB > > > > 2011/11/14 Scott Ribe <scott_r...@elevated-dev.com> > > - How large is the db? By which I mean how much disk space does the > data directory occupy? > 20 GB > > > - What's the bandwidth of the network connection to the distant slave? > during rsync, I see narly 125Mbits/sec > > > - What's the CPU & disk on each end? > disk : 6 * 146GB 15Krpm RAID10 > CPU : 16 cores Xeon(R) CPU L5630 @ 2.13GHz cache size : 12288 KB > > Only Postgres is running on my servers (no HTTP server, nothing else, > ...). CPU usage is very low. > > This afternoon, I have again sent some updates requests, which were > replicated to the sslaves. > : > - I am looking modification of modification dates and checksums of 2 > tables among my 6000 tables : > For each file, the checksum is the same on all the slaves, but different > from the checksum of the master. > For each file, the modification time is different on each node. (see below) > > So if I want to promote one slave as the master, it will not need to copy > data from the new master to the previous slaves with rsync, but it will > copy all the files from the new master to the old master (which is now a > slave). > > I shall try tomorrow topromote again a slave, and I shall rsync withh > --checksum. > I don't think that it is -a is very useful withh --checksum (no need to > preserve modification times). Do you agree ? > > > > On the master : > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867807 > -rw------- 1 postgres postgres 5914624 Nov 15 14:31 107867807 > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867807 > 23c28c6432c073d370e7e9624fd04e3b 107867807 > > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867867 > -rw------- 1 postgres postgres 5996544 Nov 15 14:31 107867867 > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867867 > 1f3398e18e22bfeb31ca2db82d8517f2 107867867 > postgres@master-db01 > :/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > > > On slave 1 : > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867807 > -rw------- 1 postgres postgres 5914624 Nov 15 14:16 107867807 > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867807 > f79d93ca00ac400f709a028c597ca4ab 107867807 > postgres@master-db01 > :/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867867 > -rw------- 1 postgres postgres 5996544 Nov 15 14:18 107867867 > postgres@master-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867867 > 3d5534f855168378f5cb2e30d622c0aa 107867867 > > > On slave 2 : > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867807 > -rw------- 1 postgres postgres 5914624 Nov 15 14:24 107867807 > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867807 > f79d93ca00ac400f709a028c597ca4ab 107867807 > postgres@slave-db01 > :/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867867 > -rw------- 1 postgres postgres 5996544 Nov 15 14:25 107867867 > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867867 > 3d5534f855168378f5cb2e30d622c0aa 107867867 > > > > On slave 3 : > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867807 > -rw------- 1 postgres postgres 5914624 Nov 15 14:16 107867807 > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867807 > f79d93ca00ac400f709a028c597ca4ab 107867807 > postgres@slave-db01 > :/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > ls -l 107867867 > -rw------- 1 postgres postgres 5996544 Nov 15 14:18 107867867 > postgres@slave-db01:/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > md5sum 107867867 > 3d5534f855168378f5cb2e30d622c0aa 107867867 > postgres@slave-db01 > :/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > postgres@slave-db01 > :/var/opt/hosting/db/profiles/bench/PG_9.0_201008051/29797$ > > Jal > > > >> >> -- >> Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org) >> To make changes to your subscription: >> http://www.postgresql.org/mailpref/pgsql-admin >> > > >
