>>> On Thu, Jul 3, 2008 at 11:25 AM, in message <[EMAIL PROTECTED]>, "Melancon, Ruddy" <[EMAIL PROTECTED]> wrote: > Our Linux Operating System under zVM is up and running, We have > installed an Oracle database application on this image. The Oracle > database is shutdown or in read-only mode and zOS or zVM performs a > flashcopy of the Linux volumes (zVM minidisks.
This is never a good idea unless the guest is completely shut down, or *all* file systems are mounted read-only at the time the copy is taken. Anything less than that will result in inconsistent file systems on the copied volumes, and you may lose data, perhaps all of it. > Is this a crash > consistent backup of all the Linux DASD volumes? Is there a data > integrity exposure and how significant is it when compared to other > operating systems like zOS or zVM? The DASD volumes are defined as ext3. There is an exposure, and it can be severe. > Let's suppose that there is a data integrity issue, then how are we > suppose to provide Global Mirroring (PPRC-xd) using TPC Replication > creating consistency groups every 30 secs? This one I can't answer. I know there is code being produced by the IBM Linux developers to allow Linux to participate in GDPS, but I've never even looked at it, so I can't comment. > How much capacity do you lose when defining Linux DASD volumes(ECKD) as > minidisk under zVM? You can plan on getting about 2.3GB of space *before* putting a file system on it. File system overhead, journal, percentage of space reserved for the root user, will all take that number lower. > How much capacity do you lose when defining Linux DASD volumes > (SCSI-ZFCP) at FBA 4k blocksizes? None, before putting a file system on it, since you don't (can't actually) run dasdfmt on it. The same caveat applies about file system overhead, etc. > Our customer would like to automate backups using the following > techniques: Please comment. > > (1) Quiese or shutdown Oracle Database under a Linux Guest. Not sufficient. See above. Mark Post ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
