On Thu, Feb 25, 2010 at 1:19 AM, Mike McCarty <Mike.McCarty at sbcglobal.net>wrote: > Eero Volotinen wrote: > > 2010/2/24 Mike McCarty <Mike.McCarty at sbcglobal.net>: > >> Agnello George wrote: > >>> Hi > >>> > >>> We have an issue with one of our clients , they have a mail server > with > >>> the /var/spool/imap partition as 150 GB . They need to take > differential > >>> backup on to /backup partition ( a different HDD of total 250 GB space > ) . > >> You've stated things in terms of solutions. You may possibly get better > >> answers if you state your goal. There is some capability you are > >> trying to achieve. Tell us what that is, and you may make more progress. > >> > >> IOW, what is the purpose of the backup? As one mentioned, RAID may > >> handle your needs. > > > > Err.. raid is NOT backup solution. > > Of course not. RAID is a means to achieve availability, > which may be his goal. Karanbir already stated a means to do > what he seemed to want, but it seemed not to satisfy his needs. > > Unless the query is placed in terms of requirements and goals, > instead of solutions, it'll be difficult to achieve satisfactory > results. > > The purpose of backup is some degree of disaster recovery, and > perhaps also migration. If that's truly his goal, then ISTM > that Karanbir suggested a viable solution to achieving avialability > while also performing backup, by doing on-the-fly duplication > of the data onto another file system which can then be backed up > at liesure. > > Doing so in a manner which ensures a true snapshot may be more > difficult to achieve, while still ensuring availability. I normally > do my backups in single user mode with all file systems mounted read > only, except the one to receive the backup. That of course precludes > availability during the backup procedure. > > That's why I would like to see what he actually wants to achieve, > instead of how he has chosen to go about it. > > Mike > -- > The requirement fro backup is not primarily for HDD failure , but human error failure . In case one of our user ( eg: the COO with huge mailbox size has delete all his certain very important mails, and he want to recover them , the contacts us as we are supposed to maintain his mail backup for a week, and we should restore his backup immediately ) this the main requirement for the backup and that too on the same server different partition . -- Regards Agnello D'souza -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100225/7908af31/attachment-0005.html>