Antonio da Silva Martins Junior wrote: > > ----- "James Olin Oden" <[EMAIL PROTECTED]> escreveu: > > For quite some time I've used raid 1 as a means of providing a > > rollback mechanism for an upgrade (which I learned from others long > > ago). So essentially, before an upgrade you split the mirrors and > > upgrade one side or the other. If your upgrade goes well you sync > > one way, if your upgrade does not you sync the other (much > hand waving > > and chanting going on, as its more complicated than that, > but that is the > > essence of the solution). > > Nice, I didn't think on this before... Will make a try :) > > > Recently, I was asked to do the same thing but with a raid 1+0 > > solution. Its easy, enough to break the raid 1 volumes underneath, > > but then how do I use the broke off volumes to form the > duplicate strip. > > Pictures may help. > > We start off looking like: > > > > /----------- Raid 0 Volume ----------\ > > | [disk 0]<---R 1--->[disk 2] | > > | | > > | [disk 1]<---R 1--->[disk 3] | > > \--------------------------------------------/ > > > > > > What we want to go to is: > > > > /--- Raid 0 ---\ /--- Raid 0 ---\ > > | [disk 0] | | [disk 2] | > > | | | | > > | [disk 1] | | [disk 3] | > > \-----------------/ \------------------/ > > Old System New System > > > > Is this possible with the current set of mdadm tools? > > Humm... didn't know if it's possible, but IMHO it'll be much > easier to > do if you use a 0+1 RAID instead of a 1+0 schema :)
I would start looking at LVM and mirroring the LV to another, break it, upgrade the LV and if that doesn't work switching over to the working LV. Or try a solution with snapshots... -Ross ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof. _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
