SSD cache for Win8 Storage Spaces
Posted: Sun Feb 03, 2013 10:38 am
Hi,
First, I want to say that this app is exactly what I was searching for. Thanks!
But there are some problems with my system and I am hoping someone can help...
My System:
*) Super Talent SSD 260GB (C: for System and D: for Cache)
*) about 10 HDD from 500GB to 3TB used as Win8 Storage Spaces Parity Storage (short: kind of flexible RAID5)
The problem with Storage Spaces is that I can't reach a higher write speed than about 25MB/sec. That's slow.
The plan was to speed up the writing with a SSD cache. So I configured 60GB from D: as L2 cache.
So from my understanding I need the "Defer Write" feature to build up my write cache. For "Latency" I configured 1800seconds (an half hour). I want to be able to copy 60GB data with filling up the cache and no speed drop. The files can be stored to the storage space when ever the pc has time for it.
Now to the Results:
I'm seeing that FancyCache is doing something and in the first seconds it is definately fast (200MB/s).
But after some GBytes the speed drops and varies at 5MB/s to 25MB/s and I don't know why. The cache usage is not higher than 20% and the copy process hasn't took longer than a few seconds. I expected that the speed drops soonest after 30 minutes copying or the L2 cache is full but bothe is definately not the case.
Can somebody explain this?
Second, the copy process of large files stucks after some time and blocks the partition. Thats fatal. I can't stop the caching. I can't stop the copy process. I can't delete the currently copyed files, I even can't use the disk any more in any way. When I open a new explorer window I can select the disk and then it's just searching for files endlessly and no file or folder is shown.
When I try to restart the machine it is "Shutting down" endlessly. The only solution was a hard reset.
Sounds like a bug to me? btw again: Win8 and the disk to speed up is a virtual sorage spaces partition.
At last I have a question:
As I said I am trying to configure a L2 SSD Write cache. It seems that L2 caching is only enabled for Read and Write config. Why is this? Is it because the Defer Write feature is a kind of Read cache? It would be cool if I could configure that the whole SSD cache is used for write only and not for read cache..
I hope someone can help...
First, I want to say that this app is exactly what I was searching for. Thanks!
But there are some problems with my system and I am hoping someone can help...
My System:
*) Super Talent SSD 260GB (C: for System and D: for Cache)
*) about 10 HDD from 500GB to 3TB used as Win8 Storage Spaces Parity Storage (short: kind of flexible RAID5)
The problem with Storage Spaces is that I can't reach a higher write speed than about 25MB/sec. That's slow.
The plan was to speed up the writing with a SSD cache. So I configured 60GB from D: as L2 cache.
So from my understanding I need the "Defer Write" feature to build up my write cache. For "Latency" I configured 1800seconds (an half hour). I want to be able to copy 60GB data with filling up the cache and no speed drop. The files can be stored to the storage space when ever the pc has time for it.
Now to the Results:
I'm seeing that FancyCache is doing something and in the first seconds it is definately fast (200MB/s).
But after some GBytes the speed drops and varies at 5MB/s to 25MB/s and I don't know why. The cache usage is not higher than 20% and the copy process hasn't took longer than a few seconds. I expected that the speed drops soonest after 30 minutes copying or the L2 cache is full but bothe is definately not the case.
Can somebody explain this?
Second, the copy process of large files stucks after some time and blocks the partition. Thats fatal. I can't stop the caching. I can't stop the copy process. I can't delete the currently copyed files, I even can't use the disk any more in any way. When I open a new explorer window I can select the disk and then it's just searching for files endlessly and no file or folder is shown.
When I try to restart the machine it is "Shutting down" endlessly. The only solution was a hard reset.
Sounds like a bug to me? btw again: Win8 and the disk to speed up is a virtual sorage spaces partition.
At last I have a question:
As I said I am trying to configure a L2 SSD Write cache. It seems that L2 caching is only enabled for Read and Write config. Why is this? Is it because the Defer Write feature is a kind of Read cache? It would be cool if I could configure that the whole SSD cache is used for write only and not for read cache..
I hope someone can help...