On Wed, 2003-11-12 at 12:23, Rod Taylor wrote: > On Wed, 2003-11-12 at 12:34, Suchandra Thapa wrote: > > I'm moving a webmail service over to use a postgresql database for > > storage and wanted to get any tips for optimizing performance. The > > machine will be a multiprocessor (either 2 or 4 cpu ) system with a raid > > array. What layout should be used? I was thinking using about using a > > raid 1+0 array to hold the database but since I can use different array > > types, would it be better to use 1+0 for the wal logs and a raid 5 for > > the database? > > How much in total storage? If you have (or will have) > ~6 disks, go > for RAID 5 otherwise 10 is probably appropriate.
I'm not sure but I believe there are about 6-8 10K scsi drives on the system. There is quite a bit of storage to spare currently so I think > > The database gets fairly heavy activity (the system handles about 500MB > > of incoming and about 750MB of outgoing emails daily). I have a fairly > > free rein in regards to the system's layout as well as how the > > applications will interact with the database since I'm writing the > > code. > > These are archived permanently -- ~450GB of annual data? Or is the data > removed upon delivery? No, it's more like hotmail. Some users may keep mail for a longer term but a lot of the mail probably gets deleted fairly quickly. The database load will be mixed with a insertions due to deliveries, queries by the webmail system, and deletions from pop and webmail. -- Suchandra Thapa <[EMAIL PROTECTED]>
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