On Tue, 30 Oct 2007 09:42:37 +0800 Ow Mun Heng <[EMAIL PROTECTED]> wrote:
> It's not an optimal setup but since I only have 3x500G drives to play > with, I can't build a Raid10, so I'm going for Raid5 to test out > capability before I decide on Raid5 vs Raid1 tradeoff. (Raid1 = No > Fault tolerance since 3 drives) > Uhhh RAID 1 is your best bet. You get fault tolerance (mirrored) plus you get a hot spare (3 drives). RAID 5 on the other hand will be very expensive on writes. Joshua D. Drake > Anyway.. I'm trying to figure out the chunk size for the raid. I'm > using 4k chunks since I'm reading that for DSS type queries, lots of > Large Reads, I should be using small chunks. [1] and I've aligned the > disks per [2] > > and my stride will 3 for ext3 > > mdadm --create --verbose /dev/md1 --level=5 --raid-devices=3 > --chunk=4 /dev/sdd1 /dev/sde1 /dev/sdf1 mkfs.ext3 -E stride=3 -O > dir_index /dev/md1 mount /dev/md1 /pgsql/ -o noatime,data=writeback > > > [1] http://wiki.centos.org/HowTos/Disk_Optimization > [2] http://www.pythian.com/blogs/411/aligning-asm-disks-on-linux > > Just wondering if there's any suggestions/comments on this from the > PG ppl here. > > Thanks for any/all comments. > > > ---------------------------(end of > broadcast)--------------------------- TIP 5: don't forget to increase > your free space map settings > -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 24x7/Emergency: +1.800.492.2240 PostgreSQL solutions since 1997 http://www.commandprompt.com/ UNIQUE NOT NULL Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate PostgreSQL Replication: http://www.commandprompt.com/products/
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