Hello there,
the reason for the reserve is that it is not counted towards your free space on the filesystem, so let's say you create a volume with 100GB and the default snap reserve of 20%, only 80GB will be available in the volume, so you can fill it up until it reaches 80GB of data. If you do not use snapshots at all, you can disable snap reserve, snap schedule and set the nosnap and nosnapdir options to on for this volume. When I need to do that, I usually use the following commands:
snap sched VOLUME 0 0 0 snap reserve VOLUME 0 vol options VOLUME nosnap on vol options VOLUME nosnapdir on
There are several options you can apply to a volume that tell the filer what to do if the snap space is growing rapidly or is exceeding the configured amount of snap reserve, f.ex. volume autogrow, deletion of old snapshots, etc. If you do not have snap reserve configured, DFM and other monitoring tools will also not be able to tell you if there's something wrong with the current amount of snapshots and the free space in the volume will go up and down whenever a snapshot is created or deleted, so basically, it's just a logical thing to separate snapshot data from real data and should help you in keeping an eye on your storage, it is not necessary at all to have a snap reserve defined for NFS or CIFS volumes, but it cerrtainly makes sense.
Bye, Alex
-----Ursprüngliche Nachricht----- Von: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] Im Auftrag von Vincent Liggio Gesendet: Donnerstag, 10. November 2011 23:34 An: toasters@teaparty.net Betreff: Snapshot reserve
We tend to have very large file systems (largest NetApp one is > 40tb), and the default 20% snapshot reserve starts to be a huge waste of space. Is there any good reason not to just set it to 0%? The snapshotted files aren't limited by the reserve, so what's the real point of it? A lot of times we end up with reserves that are only a few % in use, so it's truly wasted space. I've been setting those ones to have small reserves, and the discussion ensued whether it's worth having any reserve at all.
Thanks.
Vince Blue Sky Studios _______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters