Hi I have a HP DL380 G9 server with a P440ar Raid Controller. Im using five Samsung Pro 850 as RAID 5. The benchmark of the disks by Crystal Disk or other benchmark softwares, show that speed of read/write on the raid volume is very very low(400/300/1/10 MB) ! but when i use RAID on standard HB SAS Disk the speed is normal (1800/1600/21/200) Seems that Samsung Pro 850 have raid problem on HP P440ar. or maybe HP P440ar have problem with Samsung Pro 850! I have 2 questions: 1.What is the best config for setuping five Samsung Pro 850 as a RAID volume on HP Server!? by which raid controller? 2.Why HP P440ar array utility configuration can't enable write caching when i use Samsung Pro 850, but can enable it with standard HP hard disks!?
The ACU message is "not present or not completely charged " , but my raid controller and battery of it already exists and already charged. The message never appear when i replace the Samsung SSD 850 Pro disks with HP SAS Disks.
I have the same issue. i have 4 SSD's in RAID 5. the read performance is fine but the write is absolute pants to say the least. i get a about 10MB/s on crystal mark.
