I am trying to installing a server which will contain my virtual servers.
Initially I installed the ESXi 5.5 U2 with IBM Customization (it is a System x 3250 M4 server)
I have to move some virtual machines from an old Esxi host (ESXi 5.1)
I am using VMX Explorer to do this (Old Esxi -> Storage Server -> New Esxi) But it has been impossible to do, because the transfer rates to the new server are too slow (< 1 MB/s).
Then I installed an older version of Esxi (4.1 U2 with IBM Customization), where transfer rates were acceptable according to my network environment (5 ~ 10 MB/s), but the restored VM was unusable because it was created with a newer version. Also, having a very old version of this software is insecure.
So I don't know what is happening, I read around the internet and a possible solution could be upgrading the RAID controller (it has a ServeRaid H1110) because ESXi does not use software cache for I/O operations, but it seems it is a software problem. Perhaps the 4.1 did use software cache, I could not confirm that.