Drobo backup copy

Forum History Drobo
1

I have just managed to setup another drobo as a backup of my main drobo (media library etc) but have a problem with backup speeds?

I am using superduper to do a “copy newer files” backup and the speed is abysmal, it’s down to around 17mb/s and will take a silly time to complete even a small backup of 90gb.

The drobo’s are daisy chained on FireWire 800 on a mac mini.

This seems odd as I just managed to rip a 7gb DVD direct to the drobo with makemkv and it only took 12 minutes which is very fast.

Any ideas?

2

[quote=“davek0974, post:1, topic:40322”]
I am using superduper to do a “copy newer files” backup and the speed is abysmal, it’s down to around 17mb/s and will take a silly time to complete even a small backup of 90gb.

This seems odd as I just managed to rip a 7gb DVD direct to the drobo with makemkv and it only took 12 minutes[/quote]

I realize this is little help, but 17MB/s is typical of what I saw with my Drobo v2.
Actually, if you calculate 7GB over 720 seconds, that’s about 10MB/s which is not much faster than you see now with SuperDuper.

Hang in there, and good luck.

3

[quote=“rdo, post:2, topic:40322”]

Hmm, I suppose if you look at it like that, it’s about average then. Next thing I can’t figure out is what all the data is? AFIK there is only one time machine backup of 70gb, 11gb of new DVD rip, and a couple of days time machine incremental backups. Superduper says it has now copied 55gb but progress is not even a quarter of the way yet and it’s still evaluating files to copy.

4

Time Machine creates lots and lots and LOTS of files. There’s just a huge amount that SuperDuper will have to scan and compare, and those are all very small transactions - worst-case for I/O performance. I see the same thing on local rsync backups - by far what takes longest is analyzing the files to see what needs to be done, not the copying itself.

5

Ok thanks

Makes me wonder if it’s worth taking a backup of time machine or not?

Maybe I should just point TM straight to the backup drobo?

6

hi davek, im not sure if there is something similar on a mac but on a pc, i use syncback to backup from 1 drobo to another. i use mine in a mode called “mirror right” (but only after i tested out the concept safely, and check the backup proposals/lists of what it will do before telling it to continue)… hasnt failed me yet.

7

Thanks for that, now that i have taken time machine off the drobo’s, its all a lot happier.

I think one external disk is enough for time machine.