Just some sunday thinking from some reading i've been doing.
I've currently got my freenas box setup with the following:
24 2tb WD Black Drives
12 Mirrored Vdevs
1 Intel 400gb 750 PCI SSD for SLOG
another for L2Arc
64GB Ram
Dual 10gb Nic
Running iscsi.
we're hitting 35% on our l2 hits and 85 on arc hits.
I thought about trying two options:
Change to 2 12 drive stripes mirrors (aka 0+1)
Or try 3 Raidz's with a 3 way mirror.
Has anyone played with this?
The primary purpose for this machine is VM's and particularly file servers.
My thought about the raidz was that I would gain more storage and help keep fragmentation down. but that all depends on the performance hit of course.
My other thought has to do with the performance of the Arc and l2arc.
Would NFS not performance better being that it would be at file lever vs iscsi at the block level? Would this not be an advantage of NFS?
Also when thinking about fragmentation being that nfs is file level when removing snapshots etc and shinking the space you use wouldn't think help with fragmentation issues as well?
I've currently got my freenas box setup with the following:
24 2tb WD Black Drives
12 Mirrored Vdevs
1 Intel 400gb 750 PCI SSD for SLOG
another for L2Arc
64GB Ram
Dual 10gb Nic
Running iscsi.
we're hitting 35% on our l2 hits and 85 on arc hits.
I thought about trying two options:
Change to 2 12 drive stripes mirrors (aka 0+1)
Or try 3 Raidz's with a 3 way mirror.
Has anyone played with this?
The primary purpose for this machine is VM's and particularly file servers.
My thought about the raidz was that I would gain more storage and help keep fragmentation down. but that all depends on the performance hit of course.
My other thought has to do with the performance of the Arc and l2arc.
Would NFS not performance better being that it would be at file lever vs iscsi at the block level? Would this not be an advantage of NFS?
Also when thinking about fragmentation being that nfs is file level when removing snapshots etc and shinking the space you use wouldn't think help with fragmentation issues as well?