We just built a DL380E G8 with an integrated B320i controller. Added 8x3TB SATA Seagate 7200RPM 6Gbps in one RAID-10 array, and made 8 logical drives with 1.7TB each one.
We have installed ESXi 5.5 and we have presented all the datastores to the host.
Created a CentOS machine to test and we are having low write performance while we should have a much better one as we are using a RAID that gives us lots of performance. Please look,
[root@localhost ~]# dd bs=1M count=256 if=/dev/zero of=test conv=fdatasync
256+0 records in
256+0 records out
268435456 bytes (268 MB) copied, 4.22077 s, 63.6 MB/s
I can see that virtual machines clones, very small ones (around 20GB) are taking around 2 hours to complete.
Am I missing something ?