Hi Duncan,

I think you'll not see difference between native dumps and NDMP. Indeed, NDMP can ben seen as some kind of "remote control", so using NDMP to make backup with a Filer actually implies using dump. So NDMP is, for its most part, a mean to control dump operation, plus, and that's the added value, getting a catalog of the files backed up to easily recover them.

For further info regarding how to tune tape backup, see here : http://www.netapp.com/tech_library/3066.html#6.

Kind regards,

Michel Geldenhuys Danone Belgium SA/NV +32 2 776 68 23 michel.geldenhuys@danone.com

"Duncan Greenwood" duncan.greenwood@btinternet.com Sent by: owner-toasters@mathworks.com 26/09/2003 19:54

To: toasters@mathworks.com cc: Subject: Dump performance

Boring I know, but I'd be interested to learn what kind of backup performance people are getting for Windows/CIFS shares. I'm particularly thinking of home and shared directories with millions of small files - the usual junk that accumulates on these types of shares with hundreds of users.

I've seen amazing performance from dumps of Oracle datafiles, in the order of 90MB/s to three fibre-attached LTO-1s from an F840, but I know many small files will reduce thruput significantly. The question is how much and what would you do differently ?

I'd be grateful for any numbers people could share. We'll probably use NDMP but I guess simple dumps would give a similar performance.

Thks in advance.

D #

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