Thank you, I will be creating one big pool on the 7320, and with hardware raid four hard drives for the WALL locally.
I have read the documentation, and have used the principles from there, but it is not all applicable to my needs, I will look at the help in the application Simulator as well, as my 7110's FE crashed, and the services went into maintenance, and I am awaiting delivery for my 7320. A very good article that was advised by Hung-Sheng, white paper on the Oracle database for ZFS was a great help so far as well. Thank you for the reply. Gustav On 26 May 2011, at 5:00 PM, Giovanni Tirloni wrote: > On Thu, May 26, 2011 at 8:13 AM, Gustav <g...@phunk.co.za> wrote: > Hi All, > > Can someone please give some advise on the following? > > We are installing a 7320 with 2 18 GB Write Accelerators, 20 x 1 TB disks and > 96 GB of ram. > > Postgres will be running on a Oracle x6270 device with 96GB of ram installed > and two quad core cpus, with a local WALL on 4 hard drives, and 7320 LUN via > 8GB FC. > > I am going configure the 7320 as Mirrored with the following options > available to me (read and write cache enabled): > Double parity RAID > Mirrored > Single partiy RAID, narrow stripes > Striped > Triple mirrored > > Was does the above mean in real terms officially, > and what is optimum for a (Postgresql 9, or any performance tips for Postgres > on a 7320) database high writes, > and are there any comments that can help us improve performance? > > > Hello, > > I would advise against creating many small pools of disks unless you've very > different capacity/performance/reliability requeriments. Even then, try to > limit the number of pools as much as you can. I know newer firmwares allowed > you to create 2 pools but I guess they removed that limitation (but still > advise against it). Check the documentation in the "Help" link within the > appliance, it's usually very detailed. > > Alghouth the 7320 is an appliance and comes with its own documentation, I > think you'd benefit from reading the ZFS Best Practices Guide > (http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide). > > You're probably looking for maximum performance with availability so that > narrows it down to a mirrored pool, unless your Postgresql workload is very > specific that raidz would fit, but beware of the performance hit. > > Regards, > > -- > Giovanni Tirloni
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