What do you mean, "pull certain backup when needed" - this is a subject for a discussion about backups (which has happened before) and is completely separate from RAID - they solve two different problems. Backing up != redundancy.
You can still clone your whole hard drive to an external drive, and that's fine, but what does it honestly achieve? RAID will continue to operate when one drive crashes - that's right, continue. No shutdown, swap drive, reboot, wait. It continues. With a mobo failure, just plug both drives in a new computer, and boot. If your drives are hot-swappable, after a drive failure you replace the faulty drive, and run a raid sync, which is no different from copying to a new drive in the 'hot drive backup' solution presented. If you want to argue that you can just get up and running with the hot backup method, well - you can with RAID, too, as a "degraded" boot -- you just lose redundancy (as with the hot-backup). Basically, there is *no* drawback to the RAID solution, but there is the benefit of continued operation if one of the two drives fails (not possible with the 'hot-backup' solution). Your backups should be a separate process from redundancy, anyway. On Mon, Jan 11, 2010 at 09:08:33AM -0800, cmcanulty wrote: > Could you post the code to drive and > pull just certain backup when needed. > Also that I can move the drive in any server(regardless of disk > controller type) and have instant duplicate running in minutes.Thank > you > > On Jan 10, 12:38 pm, Daniel Eggleston <[email protected]> wrote: > > Forget the controller - use software raid. No hardware costs, works just as > > well (there's a performance hit at the extreme high end, but even that can > > be taken out with raid 10 if you need to). Keeping old files that have been > > deleted may cause issue (say you deleted a program, because it happens to > > have a security repercussion, and you're waiting on a patch). There is no > > substitute for taking periodic backups, which will keep old versions of all > > files in the case of accidental change/deletion in a much more reliable > > manner. > > > > > > > > On Sun, Jan 10, 2010 at 11:34 AM, u4david <[email protected]> wrote: > > > agree, > > > what I like about rsync is that I can go in the mirrored drive and > > > pull just certain backup when needed. > > > Also that I can move the drive in any server(regardless of disk > > > controller type) and have instant duplicate running in minutes. > > > > > my cron job mounts the dive first then mirrors the data,then unmount the > > > drive. > > > Also rsync further with out the --delete option to keeps old files > > > that may have been deleted on master drive. > > > > > On Sat, Jan 9, 2010 at 10:33 PM, Jeremiah Bess <[email protected]> > > > wrote: > > > > Not true. RAID 1 is instantaneous mirroring. rsync runs only when you > > > > set > > > it > > > > to. RAID 1 is really easy to set up and reliable. > > > > > > Jeremiah E. Bess > > > > Network Ninja, Penguin Geek, Father of four > > > > > > On Sat, Jan 9, 2010 at 20:10, u4david <[email protected]> wrote: > > > > > >> I would set up firts harddrive: > > > > > >> and then second hard drive set up us a mirror of the first drive . > > > >> use rsync,cronjob. > > > > > >> This way no need for raid. > > > >> But have backups at your finger tips. > > > >> and if the first disc fails just reconfigure the mirror as "master" > > > >> and adjust boot grub options and caboom back to original(last backup > > > >> version of mirrored rsynced copy) > > > > > >> On Sat, Jan 9, 2010 at 8:12 PM, Kari Matthews <[email protected]> > > > wrote: > > > >> > Hello, > > > >> > I have a customer who wants a new server. I convinced him to go with > > > >> > Linux > > > >> > instead of Windows. He then asked at the end that I put 2-1TB drives > > > in > > > >> > the > > > >> > server. I assume the second is for storage b/c they deal with pretty > > > >> > large > > > >> > files. > > > >> > In your opinion, what should I do with the second drive? Should I > > > >> > put > > > >> > Linux > > > >> > on both drives? I was going to do a data partition on the first > > > >> > drive > > > >> > ... > > > >> > if I did that for both, that would be 4 partitions. What is the best > > > >> > way to > > > >> > handle this? > > > >> > I know this is a rather silly question, but I am unsure how to best > > > >> > utilize > > > >> > the space on the 2nd drive. It's tempting to put it in an external > > > >> > casing > > > >> > and just use it as a backup drive. I don't know. > > > >> > Opinions welcome, since you're all brilliant. TIA. > > > >> > ~kari > > > > > >> > -- > > > >> > You received this message because you are subscribed to the Linux > > > Users > > > >> > Group. > > > >> > To post a message, send email to [email protected] > > > >> > To unsubscribe, send email to > > > >> > [email protected] > > > >> > For more options, visit our group at > > > >> >http://groups.google.com/group/linuxusersgroup > > > > > >> -- > > > >> You received this message because you are subscribed to the Linux Users > > > >> Group. > > > >> To post a message, send email to [email protected] > > > >> To unsubscribe, send email to > > > [email protected] > > > >> For more options, visit our group at > > > >>http://groups.google.com/group/linuxusersgroup > > > > > > -- > > > > You received this message because you are subscribed to the Linux Users > > > > Group. > > > > To post a message, send email to [email protected] > > > > To unsubscribe, send email to > > > [email protected] > > > > For more options, visit our group at > > > >http://groups.google.com/group/linuxusersgroup > > > > > -- > > > You received this message because you are subscribed to the Linux Users > > > Group. > > > To post a message, send email to [email protected] > > > To unsubscribe, send email to [email protected] > > > For more options, visit our group at > > >http://groups.google.com/group/linuxusersgroup > > > > -- > > > > Daniel > -- > You received this message because you are subscribed to the Linux Users Group. > To post a message, send email to [email protected] > To unsubscribe, send email to [email protected] > For more options, visit our group at > http://groups.google.com/group/linuxusersgroup
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