On 22/08/11 14:56, Robert Porter wrote:
The snapshot disk space only needs to hold the amount of the changed data -
not the whole filesystem. To the applications, it appears that a copy was
made, but actually writes are being held behind the scenes. Don't think I'm
explaining this well
Snapshotting doesn't get rid of mirroring just the need to break/merge them.
I'd still suggest using mirrors. The risk of disk failure is too great. Guess
you could use some other level of RAID to get there but it's hard to beat
spindles plus mirrors (0+1) for databases. In fact our snapshot
Here is some Pie in the Sky info for ya...
btrfs or Butter FS is being developed by Oracle for Linux.
Its one of the reasons Oracle shutdown the development of ZFS when they
bought Sun.
(ZFS has many of those snapshotting features you are talking about).
So now you have all of these spinoffs
On a relevant note. I was always told that:
The best way to get an accurate backup on U2 is to:
-Pause the writes
-Do a logical volume snapshot (*nix only)
-Resume the writes
-Let the logical volume snapshot finish copying off to your backup space to
disk.
-On top of that you should still do a
take a look at
http://www.pulsarsystems.com/uvback.html
--
Carl Dula Voice: 973-227-8440 X111
Pulsar Systems, Inc.Fax: 973-227-8440
271 US Highway 46, STE H209 email:c...@pulsarsystems.com
People are still splitting mirrors? From what I can see AIX 5.2 (Oct 2002!)
added JFS and snapshots. Removes the risk of a mirror getting merged back the
wrong way if the break-backup-merge crashes and has to be undone by hand.
Breaking the mirror means either you need to have multiple mirror
The snapshot disk space only needs to hold the amount of the changed data - not
the whole filesystem. To the applications, it appears that a copy was made, but
actually writes are being held behind the scenes. Don't think I'm explaining
this well (Monday am), so lets try an example. Say that
That's what I like...
As others have mentioned, you can pause the database. If you've got a
mirror then DBPAUSE the database, break the mirror, and DBRESUME.
Sounds so simple yet can be so complex and expensive. There are so many
ifs with the term break the mirror it's not much of a wonder
We don't mirror but we use filesystem snapshotting for a clean backup with less
than 10 seconds of downtime:
Dbpause
Sleep few (3-5) seconds
File system snapshot (5 seconds or so)
Dbresume
Backup from snapshot
Trash snapshot
Only cost in this is enough disk for snapshot.
Jeff Butera
Sent from
Jeff:
Am I mistaken to assume this is for Linux (or other variant)? See,
things aren't anywhere near as easy as they seem. :-)
Bill
jbut...@hampshire.edu wrote:
We don't mirror but we use filesystem snapshotting for
Yes this is on Linux (we don't touch windows here). Same approach works on
solaris and other *nix but I'm betting someone who knows windows better than I
could also make it work.
Jeff Butera
Sent from my iPhone
On Aug 20, 2011, at 6:56 PM, Bill Haskett wphask...@advantos.net wrote:
Jeff:
On 18/08/11 05:07, Chris Lee wrote:
Hi All,
We're running UniVerse 10.1.17 on AIX 5.3 and the backup feature
included within our vendors software is pretty basic and only allows
backups of Universe to tape.
I'm going to continue running backups to tape on a nightly basis, but
I'd also
Chris,
add the options -notag -limit 1 to your command line.
The -notag stops UV from updating the header of each record after it is
included in the backup.
The -limit 1 stops uvbackup from trying to use the shared-memory feature,
which can severely impact the performance.
The uvbackup
Chris Lee-17 wrote:
What's the best way to achieve this, is it necessary to use UniVerse's
built-in uvbackup utility ?
In the past for a small client who had a overnight 'dead' period, I used a
simple windows script (UniVerse on MS-Windows) to backup using uvbackup to a
scratch disk,
I do an additional archival backup with cp at the linux OS level
before and after our month-end batch processing since that's the data we
typically have to refer back to. I bought a 4TB iomega NAS appliance
that was relatively inexpensive just for this purpose. The archive
share is NFS mounted
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