Hi all!
Recently my IT department bought a new powervault md3800i with 2 controllers 4GB and 12 NL-SAS 8TB HDDs. It's connected to one server (r730xd) with 2x10GB ethernet NICs (one per controller).
I created one array raid 6, with one lun virtual disk 72.72 TB. Cache block size is 32kb (default value) and segment size is 256kb.
when we copy a large amount of data about 200GB (400 files of 0.5Gb each one), powervault write speed is about 600-700MB/sec.
but when we copy the same amount of data (200GB) but with 8 files of 25GB each one, the speed decreased up to 10MB/sec and the average speed is about 80Mb/sec
I recreated the virtual disk using 125kb segment size but i got exactly the same behavior. powervault firmware was upgraded to the latest version.
I would appreciate any suggestions..