On Wed, 2011-08-24 at 13:42 +0200, Federico Fissore wrote: > I add a question. Toke you said that "the current state of wear can be > queried". How?
With a S.M.A.R.T.-tool, preferably up-to-date to get it to display the vendor-specific properties in an easy to understand manner. On my Ubuntu-box with a 160GB Intel X25-M G2, sudo smartctl -A /dev/sdb1 gives me (abbreviated by me) Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 9 Power_On_Hours [...] 9372 12 Power_Cycle_Count [...] 50 225 Host_Writes_Count [...] 176888 233 Media_Wearout_Indicator [...] 0 and http://forums.storagereview.com/index.php/topic/28649-intel-x25-interpreting-smart-values/ tells me that I'll have to divide the raw value from #225 with 29,8, resulting in 5,8TB written in total (about 15GB/day). Some vendors provide specific software that makes it much easier. Intel makes the Intels SSD Toolbox that unfortunately is Windows only. > AFAIK, cells target for a write are chosen just randomly between the > free ones, ignoring other factors That would be a very bad wear-leveling strategy. Keeping a counter for each cell and selecting the free cell with the lowest count is trivial. However, given the bumpy road to great SSDs, I am sure that some vendors has done it this way. Regards, Toke Eskildsen --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
