On Wed, May 21, 2008 at 4:06 PM, Ehud Karni <[EMAIL PROTECTED]> wrote:
> On Wed, 21 May 2008 15:15:51 +0300, Erez D <[EMAIL PROTECTED]> wrote: > > > > > > If you have enough disk space you can create "pseudo" snapshots by > > > using hardlinks between the snapshots so only changed file takes space. > > > It really depends on the file size distribution - few large files that > > > change constantly will defeat this concept, while many small files is > > > ideal for this scenario. > > > > using hard links as snapshot is works only if you ensure people do not > open > > new files with append mode. > > if they do, they will modify your file as well as it's snapshot ... > > This is not the case with my suggestion. The hard link is between > "snapshots", there is no hard link to the original files. you mean you utilize something like rsnapshot ? this is a great solution. however it is not a real snapshot solution like LVM (version whatever) this is neither 'create snapshot in zero time' nor 'in zero space', contrary to LVM. total disk space is at least twice the size of your data in LVM is only once + size of changes. > > I forgot to add (it seems trivial) that the pseudo "snapshots" are > mounted read-only. > > Ehud. > > > -- > Ehud Karni Tel: +972-3-7966-561 /"\ > Mivtach - Simon Fax: +972-3-7966-667 \ / ASCII Ribbon Campaign > Insurance agencies (USA) voice mail and X Against HTML Mail > http://www.mvs.co.il FAX: 1-815-5509341 / \ > GnuPG: 98EA398D <http://www.keyserver.net/> Better Safe Than Sorry >
