>One thing to be wary of: to maintain performance and endurance, SSDs should periodically run the TRIM command. Many RAID controllers (especially 6 year old ones) don't know about SSDs so TRIM commands don't get passed to the drives. So, unless the RAID controller explicitly supports SSDs and TRIM, you'll be running any attached SSDs without the benefit of TRIM. This could lead to performance and endurance degradation faster than you might expect for standalone SSDs that get TRIMmed periodically.
>
>http://en.wikipedia.org/wiki/Trim_%28computing%29#RAID_issues
>http://en.wikipedia.org/wiki/Write_amplification#TRIM

Hi Al,

Thanks for the further info. I have found (for those who might be interested) the following:

1) Samsung offer various software to monitor and improve their SSDs. See this link and look for "Magician Software" and "Performance Restoration Software";

http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/support/downloads.html

2) My servers with SSD appear to be running TRIM which I tested using a command window and this command:

http://www.eightforums.com/tutorials/39569-trim-support-ssd-check-enable-disable.html

3) Samsung EVO SSD seem to have a very good long-life prospect. Tests done by AnandTech here:

http://www.anandtech.com/show/7173/samsung-ssd-840-evo-review-120gb-250gb-500gb-750gb-1tb-models-tested/3

.