Also, when I go into the revodrive raid utility, I set it up to use both disks (2 x 25GB) as one hardware array (50GB) but unRAID only sees both separate disks at 25GB each.  Not sure what is going on there.

No experience one way or the other, but your symptom makes it sound like the controller is a software raid, and relies on the OS driver to actually do the RAID0 function. Are you sure it's a full hardware raid?

Using any SSD right now is not a great idea because with the lack of TRIM support in unraid the performance of that drive will degrade.

I've be reading about TRIM. Many SSDs do not lose performance without TRIM. They have internal garbage collection that operates during idle periods. 30 min of idle time will restore peak performance even without TRIM.  Additionally, even degraded performance is much much better than that of HDD. The degradation is exacerbated by running contrived worst case usage scenarios that typical users will not experience. This means that the internal garbage collection is sufficient for typical use scenarios which include several minutes of idle time per hour and several hours of idle time per day. TRIM is really only required if the SSD has no garbage collection or is accessed constantly. In any case, degraded SSD performance in unRAID will not be noticeable to users. Does the Revodrive perform internal garbage collection?

No experience one way or the other, but your symptom makes it sound like the controller is a software raid, and relies on the OS driver to actually do the RAID0 function. Are you sure it's a full hardware raid?

 

BubbaQ posted this a while back. It's a hardware/software raid combo. The OS sees the two drives. The windows software layer combines them.

 

Using any SSD right now is not a great idea because with the lack of TRIM support in unraid the performance of that drive will degrade.

 

The later higher performance drives like the plextor and corsar, perform garbage collection when the drive is idle for 30 minutes.

One day when we have ext4 support, we'll have trim support. 

Until then choose a drive that has hardware based garbage collection.  Although for the most part, I have drives without garbage collection and machines without trim support and I've not had an SSD fail yet.  Then again, I don't beat up my drive with all sorts of benchmarks too.

 

The one drive that probably felt the most pain was a drive I had VMware images on whereby one of the images was a 24x7 windows xp instance.

Using any SSD right now is not a great idea because with the lack of TRIM support in unraid the performance of that drive will degrade.

 

You can format and mount the drive as ext4 - which I believe has trim support. (may not work as a native cache drive, but easy enough to run your own mover script with rsync).

Has this subject been expanded on anymore with the current rc11 release?

 

My SSD as a cache drive became so slow in 3 days - I am moving the stuff off of it back on to a regular hd - its taking forever.

 

This SSD has garbage collection built into it - but I have found out that it needs to be idle for 30 minutes to do so, that will never happen as a cache drive with plugins running off it.....

 

Myk