Hello, ok i am building new 64bit system with Gentoo and will have 650gb partition for storing my digital images. file will range in size from 3mb to 200mb with average about 20mb.
The partition is on a raid 1 array, the hardware for array is areca sata pciE raid card with 256mb ram, 500mhz processor, drives are 2x750gb Hitachi 7k1000. The 650gb array is set 128k stripe size.
Now i have read and used the IBM article for setting up XFS but never for array this size.
The guide talks about allocation groups
The second option lets you enhance the performance of your new filesystem by telling mkfs.xfs to minimize the number of allocation groups that are created. Normally, mkfs.xfs chooses the number of allocation groups automatically, but from my experience it usually picks a number that is a bit too high for most general-purpose Linux workstations and servers. As you'll recall from my previous article, allocation groups let XFS perform multiple metadata operations in parallel. This comes in handy on high-end servers, but too many allocation groups do add a bit of overhead. So rather than let mkfs.xfs choose the number of allocation groups for your filesystem, specify a number by using the -d agcount=x option. Set x to a small number, something like 4, 6, or 8. You'll need at least one allocation group for every 4 GB of capacity in your target block device.
but following that a 650gb xfs partition will have very high number for allocations groups, is there max or should go with 1 for every 4gb?
If do then allocation group number would be in the thousands!!
Any tips for setting up xfs for this partition?