Backup NAS542

QmpCP · May 2020

There is a problem with NAS542. I'm trying to backup 5 Tb data from NAS to Ubuntu Server via SSH:

ssh -T -c [email protected] -o Compression=no -x [email protected] '(cd /i-data/sysvol/; tar cf - Resource | mbuffer -m 1024M | sudo tar xf -

But average speed is ~10 MB/s (~80 Mbit/s). iperf NAS with Ubuntu Server shows 850 Mbit/s.

If I mount Resource of NAS via cifs (smb) at Ubuntu Server, it starts faster but after time it starts copy one file (300 Kb) for 5 seconds. Used commands:

tar cf - /mnt/NAS/Resource | mbuffer -m 1024M | (cd /home/backup/; sudo tar xf -)
ls /mnt/NAS/Resource | xargs -n1 -P2 -I{} rsync -Pa "{}" /home/backup

Speed via SSH stable but slow. Speed via mounting resource high but only first time.

Is there any way to:

Speed up SSH transfer or...
Solve problem with speed comes to 0 via rsync/tar with mounting (smb/cifs)?

Mijzelf · May 2020

Really? Shame on me.

I'll tell you a secret. The server part of MetaRepository is powered by (busybox) inetd. That was the result of the search for the smallest (in bytes) possible solution. And for some reason which I can't remember anymore I also added nc to the busybox binary. So by executing

/i-data/sysvol/.PKG/MetaRepository/bin/busybox-metarepo nc

you'll have your nc. (Or create a symlink).

Another option is to install Entware netcat. But that is a bit heavy for just installing nc.

QmpCP · May 2020

Resource mounted by:

sudo mount -t cifs //10.100.0.1/Resource /mnt/NAS/Resource -o username="backup",password="password"

Mijzelf · May 2020

I think the CPU of the NAS maxes out on encryption of a 80mbit stream. Try netcat instead.

QmpCP · May 2020

Is there any way to add nc to NAS? Wasn't found it at RandomTools.

Backup NAS542

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