On Fri, 16 May 2014 15:51:40 Rohan McLeod wrote:
We started discussing SSD boot drives and it was suggested that SSD boot drives with both sata 3.0 and PCIe interfaces suffer from a fairly severe slow-down problem after about 6 - 12months use. 1/ Has anyone noticed such a problem ? 2/ If such problem exists any theories ? - all I could think was that somehow boot drives were subject to extreme wear and the reallocated 'cells' were at the end and somehow the replacement 'out-of-sequence' cells; were slowing the drive down in the manner of a fragmented rotating drive ?
There is nothing special about boot drives. Drives just respond to read and write requests, booting is no different from other reads. http://etbe.coker.com.au/2014/04/27/swap-breaking-ssd/ There are rumors that swap breaks SSD, I wrote the above post to refute that. While there are probably some usage patterns where swap would cause problems one could say that same about /home, /var/log, or any other filesystem or subtree. https://en.wikipedia.org/wiki/TRIM The TRIM command can theoretically improve performance in some situations. However it also significantly decreases performance in other situations. So for a typical use with BTRFS it's recommended that you not use it. Note that when the SSD erase list gets fragmented such that TRIM helps will depend on work load. It could happen in a matter of days or not happen in a year. Also it would depend on the quality of the SSD. I've redirected this to luv-main. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/