- I have a server with a RAID1 D: drive that includes dual 8TB HDDs. On this array I have put the server's VMs.
- The server has a RAID1 C: drive for the OS with two 256GB SSDs.
- The server also has a 120GB spare SSD.
Intel RST says it can use this spare SSD as a caching disk, with maximum size of 64GB.
Does it help the Hyper-V files, which are 100+ GB?
I was under the impression that the SSD/RST caching performance is only for files that would actually "fit" into the SSD cache, so files <64GB.
Can anyone comment on my assumption?
And is there any way Hyper-V VM files can get their speed increased?
In SmartResponse tech brief noted, that driver operates with data blocks, not files. So it may be not always the file should be in size of caching SSD. Although the Hyper-V works with storage via own storage driver filter, so unlikely SR/RST are capable to look into Hyper-V I/O operations.
If SSD fails, the Intel® Rapid Storage Technology software will show a pop-up letting know the customer that there is an issue with the SSD. All the information is always kept in the Hard Disk Drives.
I recommend you the article: Intel® Smart Response Technology User Guide
http://www.intel.com/content/www/us/en/support/boards-and-kits/000005501.html Intel® Smart Response Technology User Guide
Thanks for reply. I have read the guide but not very informative particularly as this is a production server, not much information about how this works and we are very concerned about data loss.
With regard to the question about HyperV if the virtual machine is using a physical disc rather than VHD would this be cached ? In order to use a physical disc that this must be off-line in windows disk management so would the IRT cache still apply ?
Also can we use IRT Raid 1 with offline disks ie would they be selectable in the IRT gui as available for acceleration?
To Confirm as follows.
1. Intel Raid cannot be used with SSD raid 1 as trim not supported see other thread.
2. Intel RST does not support cache on SSD for Hyper V vhd
3. Intel Raid cannot be used with Offline disks therefore direct disk attach for Hyper V not supported.
In the new server I have just built now regret the choice of hardware as cant use SSD and raid 1.
TRIM is supported in AHCI and RAID mode for drives not part of a RAID volume.
More details in the link below:
http://www.intel.com/content/www/us/en/support/boards-and-kits/000005807.html RAID Features by Chipset or Controller Hub