Displaying 2 results from an estimated 2 matches for "15k5".
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2008 Oct 02
1
Terrible performance when setting zfs_arc_max snv_98
Hi there.
I just got a new Adaptec RAID 51645 controller in because the old (other type) was malfunctioning. It is paired with 16 Seagate 15k5 disks, of which two are used with hardware RAID 1 for OpenSolaris snv_98, and the rest is configured as striped mirrors as a zpool. I created a zfs filesystem on this pool with a blocksize of 8K.
This server has 64GB of memory and will be running postgreSQL, so we need to cut down ARC memory usage...
2008 Jun 30
20
Some basic questions about getting the best performance for database usage
...row, it should be possible to add more disks to be able to handle the extra IO.
And that is exactly where ZFS comes in, at least as far as I read.
The question is: how can we maximize IO by using the best possible combination of hardware and ZFS RAID?
I''ll probably be having 16 Seagate 15K5 SAS disks, 150 GB each. Two in HW raid1 for the OS, two in HW raid 1 or 10 for the transaction log. The OS does not need to be on ZFS, but could be.
So that leaves 10 or 12 disks to configure for the database. The question is how to divide them to get the best IO performance by mixing the best o...