A couple of more supporting links regarding TRIM and wear-leveling (from Truecrypt): http://www.truecrypt.org/docs/?s=trim-operation http://www.truecrypt.org/docs/?s=wear-leveling
On Tue, Jan 3, 2012 at 12:21 PM, Chris O'Connell <omegah...@gmail.com>wrote: > That has not been my experience at all. I have personally encrypted two > machines that had SSD drives, both had modern CPUS, one was an I3 and one > an I7. There was a substantially noticeable decrease in performance using > TrueCrypt. In fact, the wait times increased so much after encrypting that > I grew impatient waiting for boot times and Microsoft Office load times. > > This article has some scientific testing regarding performance on SSD > drives that are encrypted: > > http://media-addicted.de/ssd-and-truecrypt-durability-and-performance-issues/744/ > > > > > On Tue, Jan 3, 2012 at 12:07 PM, Edward Ned Harvey <b...@nedharvey.com>wrote: > >> > From: discuss-bounces+blu=nedharvey....@blu.org [mailto:discuss- >> > bounces+blu=nedharvey....@blu.org] On Behalf Of Chris O'Connell >> > >> > ALSO, NO FULL DISK ENCRYPTION should ever be used on an SSD drive. >> > Performance will drop by 30% and the drive's wear-leveling system and >> > TRIM >> > won't function correctly. >> >> First of all, the supposed 30% performance hit takes you down from 200% to >> 170% performance as compared to an HDD (or whatever arbitrary numbers we >> want to make up for comparing HDD vs SSD performance where SSD >> performance > >> HDD performance). >> >> Second of all, some OSes support TRIM on encrypted drives. They just >> reduce >> the size of disk they consume by some percentage, and TRIM the unused >> blocks >> as necessary, so there are always some blocks available for use that have >> been TRIM'd. >> >> Third of all, some SSD's support the virtual size reduction as above, but >> do >> it at the hardware level, so there are always TRIM'd blocks available. >> >> In any of the above scenarios, the end result is no significant >> performance >> degradation on SSD's caused by TRIM vs Encryption. >> >> > > > -- > Chris O'Connell > http://outlookoutbox.blogspot.com > > -- Chris O'Connell http://outlookoutbox.blogspot.com _______________________________________________ Discuss mailing list Discuss@blu.org http://lists.blu.org/mailman/listinfo/discuss