- Dec 11, 2015
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I have a recently built system based on a Z97 motherboard.
I have enabled Intel RAID and have an SSD installed, partitioned as a boot device with a 20GB partition set aside as a SRT cache for my RAID 5 storage array (3x 1TB HDD).
Everything is set up and configured in Intel Rapid Storage Technology, and both "drives" appear to Windows as they should. The boot SSD is, as expected, lightning fast. I was expecting similar performance for frequently used files on the raid array, due to the SRT caching. I wasn't getting it.
So I then ran some tests using CrystalDiskMark. It's actually slower with caching turned on.
Am I missing something? I guess it could be a peculiarity with CDM, but the drive itself does feel slow when in use, and there is no real-world appreciable difference with caching switched on.
I did do another test, by installing the OS on the RAID array and using the whole (or as much of it as SRT would let me) SSD as a cache. This, too, was unbearably slow.
Here's the stats for my RAID array without SRT
And here they are with SRT switched on
And here's my RST settings
https://dl.dropboxusercontent.com/u/5624452/SRT.jpg
I have enabled Intel RAID and have an SSD installed, partitioned as a boot device with a 20GB partition set aside as a SRT cache for my RAID 5 storage array (3x 1TB HDD).
Everything is set up and configured in Intel Rapid Storage Technology, and both "drives" appear to Windows as they should. The boot SSD is, as expected, lightning fast. I was expecting similar performance for frequently used files on the raid array, due to the SRT caching. I wasn't getting it.
So I then ran some tests using CrystalDiskMark. It's actually slower with caching turned on.
Am I missing something? I guess it could be a peculiarity with CDM, but the drive itself does feel slow when in use, and there is no real-world appreciable difference with caching switched on.
I did do another test, by installing the OS on the RAID array and using the whole (or as much of it as SRT would let me) SSD as a cache. This, too, was unbearably slow.
Here's the stats for my RAID array without SRT
Code:
Sequential Read (Q= 32,T= 1) : 87.792 MB/s
Sequential Write (Q= 32,T= 1) : 52.058 MB/s
Random Read 4KiB (Q= 32,T= 1) : 2.884 MB/s [ 704.1 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 1.602 MB/s [ 391.1 IOPS]
Sequential Read (T= 1) : 115.329 MB/s
Sequential Write (T= 1) : 53.485 MB/s
Random Read 4KiB (Q= 1,T= 1) : 1.098 MB/s [ 268.1 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 1.503 MB/s [ 366.9 IOPS]And here they are with SRT switched on
Code:
Sequential Read (Q= 32,T= 1) : 64.008 MB/s
Sequential Write (Q= 32,T= 1) : 13.028 MB/s
Random Read 4KiB (Q= 32,T= 1) : 2.732 MB/s [ 667.0 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 0.951 MB/s [ 232.2 IOPS]
Sequential Read (T= 1) : 88.092 MB/s
Sequential Write (T= 1) : 11.953 MB/s
Random Read 4KiB (Q= 1,T= 1) : 0.524 MB/s [ 127.9 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 0.394 MB/s [ 96.2 IOPS]And here's my RST settings
https://dl.dropboxusercontent.com/u/5624452/SRT.jpg
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