Hey Guys!
So I've recently upgraded from an ancient Areca ARC-1260 controller to a MegaRAID SAS 9361-8i controller with the Cache Cade option.
I am running the controller with:
My Raid5 Volume is configured like this:
The CacheCade Volume is configured as RAID1 with the following parameters:
I have had big troubles when unpacking or creating large files (5-30 GB) on the volume. Write speeds range from 45-65 MB/s WITH cache cade, 300-500 MB/s without.
Also with cacheCade enabled taskmanager shows 100% utilization of the volume even with light loads like extracting a rar archive.
I've extraced a 10GB rar file - taskmanager is showing ~50MB/s of write speed and 100% utilization. During the extraction I've disabled cachecade via the megaraid console and utilization immediately dropped to ~30% and write speeds went up to 350-400MB/s.
Sequentials benchmarks with HDTune with CacheCade enabled seem to be fine, apart from the really bad read performance:
With CachCade Volume set to "Write Through":
(Horrible IOPS, good Sequential Performance)
With CacheCade Volume set to "Write Back":
(Slightly better Read IOPS, but still bad. Good sequential write, bad sequential read performance)
Same test WITHOUT CacheCade:
Notice how the Write IOPS are way higher without cachecade?
For comparison: this is the same benchmark with an older samsung 850 EVO 500GB drive on the motherboards SATA connector:
Quite frankly those would be the IOPS Performance numbers I'd expect from the controller with CacheCade enabled.
Testing with CrystalDiskMark and CacheCade is another story:
Same Scenario without SSD Cache:
Read Access Times/Speeds with cache cade / write through:
Read Access Times/Speeds with cache cade / write back:
Read Access Times/Speeds without cache cade:
As you can see there's hardly any difference between ssd cache and no ssd cache. Infact without the cache the setup outperforms the ssd cache at times.
Again for comparison an older Samsung 850 EVO 500GB drive:
Any Idea what's going on here?
Thanks
So I've recently upgraded from an ancient Areca ARC-1260 controller to a MegaRAID SAS 9361-8i controller with the Cache Cade option.
I am running the controller with:
- 4x HGST Ultrastar HE12 HUH721212ALE600 12 TB drives in a RAID5 Volume
- 2x Samsung 860 Pro 500GB SSD drives in a RAID1 Volume for CacheCade
My Raid5 Volume is configured like this:
The CacheCade Volume is configured as RAID1 with the following parameters:
I have had big troubles when unpacking or creating large files (5-30 GB) on the volume. Write speeds range from 45-65 MB/s WITH cache cade, 300-500 MB/s without.
Also with cacheCade enabled taskmanager shows 100% utilization of the volume even with light loads like extracting a rar archive.
I've extraced a 10GB rar file - taskmanager is showing ~50MB/s of write speed and 100% utilization. During the extraction I've disabled cachecade via the megaraid console and utilization immediately dropped to ~30% and write speeds went up to 350-400MB/s.
Sequentials benchmarks with HDTune with CacheCade enabled seem to be fine, apart from the really bad read performance:
With CachCade Volume set to "Write Through":
(Horrible IOPS, good Sequential Performance)
With CacheCade Volume set to "Write Back":
(Slightly better Read IOPS, but still bad. Good sequential write, bad sequential read performance)
Same test WITHOUT CacheCade:
Notice how the Write IOPS are way higher without cachecade?
For comparison: this is the same benchmark with an older samsung 850 EVO 500GB drive on the motherboards SATA connector:
Quite frankly those would be the IOPS Performance numbers I'd expect from the controller with CacheCade enabled.
Testing with CrystalDiskMark and CacheCade is another story:
Same Scenario without SSD Cache:
Read Access Times/Speeds with cache cade / write through:
Read Access Times/Speeds with cache cade / write back:
Read Access Times/Speeds without cache cade:
As you can see there's hardly any difference between ssd cache and no ssd cache. Infact without the cache the setup outperforms the ssd cache at times.
Again for comparison an older Samsung 850 EVO 500GB drive:
Any Idea what's going on here?
Thanks