One thing that SnapMirror can do, that NDMPcopy and rsync won't do is, not show the changes until the entire SnapMirror operation is complete. With NDMPcopy and rsync, as each changed file is copied, the change is seen immediately on the destination, whereas with SnapMirror, the changes are all made at once. Depending on the type of data and the schedule of sync'ing, this may or may not be desirable.
Aaron
-----Original Message----- From: Eyal Traitel (r55789) [mailto:eyal.traitel@motorola.com] Sent: Monday, May 22, 2000 8:45 AM To: toasters@mathworks.com Subject: Re: software distribution with NDMPcopy/SnapMirror over WANs?
I believe "rsync" utility can help you out....
Eyal.
Aaron.Sims@netapp.com wrote:
-----Original Message----- From: Thaller Horst (MDCA Villach)
[mailto:Horst.Thaller@infineon.com]
Sent: Monday, May 22,
2000 3:41 AM
To: 'toasters@mathworks.com' Subject: software distribution with NDMPcopy/SnapMirror over WANs?
Who has experiences with software distribution/syncronisation over WANs with NDMPcopy or SnapMirror?
We have a software pool at our master site, where we maintain our software (~ 500 GB) and then we distribute the changes to our client sites. Our actual rcp/ssh-based solution has several drawbacks:
- No automatic syncronisation
- Transfer of whole sw-packages only
- Only Unix-packages supported (no NT packages)
My idea is to do this job with NDMPcopy or SnapMirror, but I have a lot of questions: Can I export (ro) the mirrored volumes? (NDMP, SnapMirror)
SnapMirror, yes. The target volume of a SnapMirror
operation is always
read-only. If you make it read-write, another Level 0 dump
is required.
It´s possible to tunnel NDMP/SnapMirror with ssh?
SnapMirror, no. NDMPcopy, maybe... I never tried.
Can I mirror more than one site with SnapMirror?
Yes, easily.
Cascaded distribution?
SnapMirror, no. NDMPcopy, maybe.
Is there a commercial product?
SnapMirror is a commercial product, contact your sales rep
for more info.
Hope that helps.
Aaron