Mark Breen
marklbreen at gmail.com
Mon Oct 3 14:33:30 CDT 2011
Hi John >The algorithms are not particularly compute intensive and in fact there are apparently instructions on newer processors dedicated to encryption. this was what I thought I read, that there was some dedicated hardware that is a tunnel that is used all the time, so it makes no difference whether it is encrypted or not, somehow, it sounded too good to be true. thanks Mark On 3 October 2011 11:32, jwcolby <jwcolby at colbyconsulting.com> wrote: > > I read in the docs that it does not / cannot slow the machine down even > by less than 1%. They actually said it as a 0% performance hit. > > The truth is that the impact depends directly on the horsepower of the > processor. On a low end Celeron it would be largish. On a single core AMD > or Intel it would be barely noticeable and on anything more powerful, > including multi-cores it is negligible. > > > > Do you know how / why that is ? > > The impact is "fixed" in that it has to run each sector read through > decryption. The algorithms are not particularly compute intensive and in > fact there are apparently instructions on newer processors dedicated to > encryption. > > > John W. Colby > Colby Consulting > > On 10/3/2011 5:37 AM, Mark Breen wrote: > >> Hi John, >> >> I used True Crypt last year for an External Disk and it seemed to work >> well. >> >> I read in the docs that it does not / cannot slow the machine down even by >> less than 1%. They actually said it as a 0% performance hit. >> >> Do you know how / why that is ? >> thanks >> Mark >> >> >> On 1 October 2011 21:13, jwcolby<jwcolby@**colbyconsulting.com<jwcolby at colbyconsulting.com>> >> wrote: >> >> The last iteration with my laptop I used Windows Bit locker to perform a >>> whole disk encryption. This time I am using Windows 7 Home Premium which >>> does not include Bit locker. I had just about decided to use True Crypt >>> anyway because with Bil Locker I was unable to mount the old hard disk on >>> another computer to pull the old contents off onto the new disk. >>> >>> So when I installed Windows 7 I broke the disk into three partitions, a 6 >>> gig for the swap file, 100 gig for the OS/programs and 400 gig for data. >>> I >>> then started Truecrypt and told it to go to work encrypting the whole >>> thing >>> and went to bed. In the morning... the computer had decided to sleep >>> during >>> the night (lazy thing!) and so it was only 25% finished. >>> >>> It took most of the day to finish encrypting the entire disk (all >>> partitions) and so here I am. >>> >>> Having done that I decided to hang the truecrypt encrypted disk on >>> another >>> computer, put the old disk back in and push the disk contents out to the >>> other disk. >>> >>> The other disk would not finish loading Windows with the truecrypt >>> encrypted disk on it! It would start to load Windows (2008 server) and >>> then >>> apparently it ran into the true crypt disk and couldn't handle it. It >>> just >>> hung, never finished loading windows. >>> >>> In the end I told the bitlocker software to unencrypt the old disk, then >>> hung that on another machine and put the truecrypt disk back in the >>> laptop, >>> and pulled everything into the new disk. Well not everything but you know >>> what I mean. At least I can do that with the unencrypted disk drive. >>> >>> Things never work the way I envision them working. >>> >>> Truecrypt is not significantly slowing down the new disk. I do have to >>> enter the password at the point where the bios tries to load windows, >>> then >>> off it goes. Not good for auto reboot after software updates... >>> >>> -- >>> John W. Colby >>> Colby Consulting >>> ______________________________****_________________ >>> dba-SQLServer mailing list >>> dba-SQLServer@**databaseadviso**rs.com <http://databaseadvisors.com>< >>> dba-SQLServer@**databaseadvisors.com<dba-SQLServer at databaseadvisors.com> >>> > >>> http://databaseadvisors.com/****mailman/listinfo/dba-sqlserver<http://databaseadvisors.com/**mailman/listinfo/dba-sqlserver> >>> **<http://databaseadvisors.com/**mailman/listinfo/dba-sqlserver<http://databaseadvisors.com/mailman/listinfo/dba-sqlserver> >>> **> >>> http://www.databaseadvisors.****com<http://www.**databaseadvisors.com<http://www.databaseadvisors.com> >>> > >>> >>> >>> ______________________________**_________________ >> dba-SQLServer mailing list >> dba-SQLServer@**databaseadvisors.com <dba-SQLServer at databaseadvisors.com> >> http://databaseadvisors.com/**mailman/listinfo/dba-sqlserver<http://databaseadvisors.com/mailman/listinfo/dba-sqlserver> >> http://www.databaseadvisors.**com <http://www.databaseadvisors.com> >> >> >> ______________________________**_________________ > dba-SQLServer mailing list > dba-SQLServer@**databaseadvisors.com <dba-SQLServer at databaseadvisors.com> > http://databaseadvisors.com/**mailman/listinfo/dba-sqlserver<http://databaseadvisors.com/mailman/listinfo/dba-sqlserver> > http://www.databaseadvisors.**com <http://www.databaseadvisors.com> > >