Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
Hi Usama yes, currently I am reading a brochure about Continuent uni/cluster for PostgreSQL. Looks quite interesting. Another product sounds promising: Cybercluster from www.postgres.at English Product Description: http://www.postgresql.at/picts/download/dokumentation/documentation_cybe rcluster.pdf Anyone has made experiences with it? thanks Ragnar From: Usama Dar [mailto:[EMAIL PROTECTED] Sent: Freitag, 30. November 2007 10:35 To: Ragnar Heil Cc: pgsql-general@postgresql.org Subject: Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing On 11/29/07, Ragnar Heil <[EMAIL PROTECTED]> wrote: Hi our customer has got the following requirements: Req1) Master master replication supported, not only master / slave replication with only the master being writable. If you do have multiple slave systems they are only useful from a backup and standby perspective. Our Application must have a db-connection it can write to. Req2) Replication of schema should also be possible, not only data Req3) Not only a hot-standby-solution is needed. Load Balancing is wanted for the future. Currently I am looking at EnterpriseDB but it seems that they dont support multiple master-replication best regards Ragnar ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org/ Have you looked at pgCluster or Continuent's uni/Cluster? -- Usama Munir Dar http://linkedin.com/in/usamadar Consultant Architect Cell:+92 321 5020666 Skype: usamadar ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
On 01.12.2007, at 09:35, Ragnar Heil wrote: WHich solution are you using now, Guido? For the one installation we needed multi-master, we have FrontBase running. PostgreSQL multi-master just wasn't "right" for us. Too much hardware needed to get real redundancy, the setup is too complex and didn't provide what we needed: multi-master replication with two machines for real redundancy not really performance (which is good enough with one simple, cheap server), load-balancing is done in the apps (we have instances connecting to one or the other server), automatic failover in case of one server goes down. If we want to bring it back up, it's a matter of some really simple commands and it synchronizes itself with the master, no copying of files, no complex scripting, no complex procedures at all. Performance of one PostgreSQL server would be faster compared to that setup, at least for the load we have, as FrontBase seems to be getting slower with inserting in large tables with complex indexes. PostgreSQL index creation is way faster. There are also other annoying things we have seen, but overall the solution works fine. cug ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
WHich solution are you using now, Guido? Has anyone made experiences with cybercluster? I am thankful to hear comments and especially comparision to other products thanks Ragnar > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Guido Neitzer > Sent: Freitag, 30. November 2007 21:03 > To: Shane Ambler > Cc: Postgresql General > Subject: Re: [GENERAL] Postgres High Availablity Solution > needed for hot-standby and load balancing > > On 30.11.2007, at 12:50, Shane Ambler wrote: > > >> I project where the "latest news" page shows the newest entry from > >> March 2005 and the install talks only about PostgreSQL 8.0 isn't > >> really inspiring confidence ... > > > > Although they aren't the fastest with releases, they really > aren't as > > bad as that. > > Nicely said ... ;-) Yeah, I was looking at the wrong site. > Maybe there should be a redirect to the new page to avoid that. > > I have last looked at pgcluster back in 2005 when I was > trying to find an affordable multi master solution an the > setup sounded so horrific that we spent about 10k EUR to get > a different solution that is actually working fine now. > Setting this up on just two machines was about 10 minutes work ... > > I hope the setup has changed to the better. > > cug > > ---(end of > broadcast)--- > TIP 5: don't forget to increase your free space map settings > ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
On 30.11.2007, at 12:50, Shane Ambler wrote: I project where the "latest news" page shows the newest entry from March 2005 and the install talks only about PostgreSQL 8.0 isn't really inspiring confidence ... Although they aren't the fastest with releases, they really aren't as bad as that. Nicely said ... ;-) Yeah, I was looking at the wrong site. Maybe there should be a redirect to the new page to avoid that. I have last looked at pgcluster back in 2005 when I was trying to find an affordable multi master solution an the setup sounded so horrific that we spent about 10k EUR to get a different solution that is actually working fine now. Setting this up on just two machines was about 10 minutes work ... I hope the setup has changed to the better. cug ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
Guido Neitzer wrote: On 30.11.2007, at 02:34, Usama Dar wrote: Have you looked at pgCluster I project where the "latest news" page shows the newest entry from March 2005 and the install talks only about PostgreSQL 8.0 isn't really inspiring confidence ... Although they aren't the fastest with releases, they really aren't as bad as that. You would be looking at http://pgcluster.projects.postgresql.org/ which has been neglected for some time. You can find the most current source downloads at pgfoundry http://pgfoundry.org/projects/pgcluster/ which has the last release at May 2007. The project home is now at http://www.pgcluster.org (but they seem to use pgfoundry to store the release tarballs) Also Cybertec appears to have branched off from pgcluster http://www.postgresql.at/english/pr_cybercluster_e.html -- Shane Ambler [EMAIL PROTECTED] Get Sheeky @ http://Sheeky.Biz ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
On 30.11.2007, at 02:34, Usama Dar wrote: Have you looked at pgCluster I project where the "latest news" page shows the newest entry from March 2005 and the install talks only about PostgreSQL 8.0 isn't really inspiring confidence ... Continuent is very active, but it limits the servers to Linux, it seems it doesn't work on BSD or Mac OS X. At least, these are not listed on the product page for uni/cluster. The lack of an integrated multi master clustering solution in PostgreSQL is the only real downside I can see. For me it is better to have something that is well integrated, functional and supported but only fits the needs for about 80% of the people in need for a multi master than having nothing and always pointing to very old or poor or commercial commercial solutions. But that is just my personal view on that. I know that a multi master cluster is a very complex feature, but you can't always throw more (the existing solutions need AFAIK at least four servers to be redundant) or bigger hardware or expensive solutions if you only need load balancing but your app needs to be able to write to whatever server it is connected. In that respect, I really like the solution in FrontBase, where you can do multi master with two servers, schema synchronization is included, you can connect or disconnect servers from the cluster at any time, it is fully transparent for the application, you just add more addresses to the JDBC connection string. This might not fit the needs for a couple of users, but it fits for the vast majority. Personally I can live without a multi master solution for PG at the moment as I just use a different product if I need it and live with the downsides of said product (cost for Oracle and similar, less configuration options and lower performance with FrontBase, other problems with other DMBS). cug ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org/
Re: [GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
On 11/29/07, Ragnar Heil <[EMAIL PROTECTED]> wrote: > > Hi > > our customer has got the following requirements: > > Req1) Master master replication supported, not only master / slave > replication with only the master being writable. If you do have multiple > slave systems they are only useful from a backup and standby > perspective. Our Application must have a db-connection it can write to. > > Req2) Replication of schema should also be possible, not only data > > Req3) Not only a hot-standby-solution is needed. Load Balancing is > wanted for the future. > > > Currently I am looking at EnterpriseDB but it seems that they dont > support multiple master-replication > > best regards > Ragnar > > > > ---(end of broadcast)--- > TIP 4: Have you searched our list archives? > > http://archives.postgresql.org/ > Have you looked at pgCluster or Continuent's uni/Cluster? -- Usama Munir Dar http://linkedin.com/in/usamadar Consultant Architect Cell:+92 321 5020666 Skype: usamadar
[GENERAL] Postgres High Availablity Solution needed for hot-standby and load balancing
Hi our customer has got the following requirements: Req1) Master master replication supported, not only master / slave replication with only the master being writable. If you do have multiple slave systems they are only useful from a backup and standby perspective. Our Application must have a db-connection it can write to. Req2) Replication of schema should also be possible, not only data Req3) Not only a hot-standby-solution is needed. Load Balancing is wanted for the future. Currently I am looking at EnterpriseDB but it seems that they dont support multiple master-replication best regards Ragnar ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org/
