AIO ESXi 5.5 with FreeNAS slow read on 4x mirrored S3500?

[nk215]

Hi Guys,

I am testing out FreeNAS served back to ESXi via NFS in a AIO setup.

My freeNAS (11) setup has a LSI 9300-8i card connecting to 4xS3500 600GB Intel SSD mirrored. Total usable space is 1.2gb

when I served my NFS back to my ESXi and created a Win7 HDD with that data store. My CrystalDisk Mark

Read:
Seq/Q32 : 1274
4K: 255
Seq: 788
4K: 21

My Write speed is very slow
Seq/Q32: 237
4K/Q32: 12
Seq: 198
4K: 6

What's going on?

Thanks

 

[Rand__]

Have you set the datastore to async? NFS is sync per default and thats slow unless you got a good slog which the s3500's natively are not.

Gea has a very nice comparison here: ZFS performance vs RAM, AiO vs barebone, HD vs SSD/NVMe, ZeusRAM Slog vs NVMe/Optane
Lucky for you he has some S3510's in there