Search found 2 matches
- Thu Apr 30, 2015 2:47 pm
- Forum: Storage
- Topic: Samsung SM951 AHCI SSD Performing Poorly At Sub-4k File Size
- Replies: 6
- Views: 16645
Re: Samsung SM951 AHCI SSD Performing Poorly At Sub-4k File
The reason the microsoft driver is issuing FUA IO commands to the SM951 is quite simple. The SM951 does not have a battery backed cache, so it cannot guarantee writes in a power loss situation. This is not the case with the Intel 750 as they have full power loss protection and hence FUA IO commands ...
- Mon Apr 27, 2015 2:28 pm
- Forum: Storage
- Topic: Samsung SM951 NVMe M.2 PCIe Drive - Low Performance on SSD
- Replies: 7
- Views: 17046
Re: Samsung SM951 NVMe M.2 PCIe Drive - Low Performance on S
Apparently Microsofts drivers is issuing a Forced IO command that causes the drive to bypass the DRAM cache and write directly. This of course kills performance. Similar to write through cache policy's on raid controllers. http://www.sqlskills.com/blogs/glenn/beware-of-the-native-microsoft-nvme-driv...