Active Backup For Business is slow and slows down the NAS

[tree4939]

I have two DS918+ in a high availability configuration and I backup about 20 Windows office machines to it with very low volume data (about 1GB/machine/day most of which is seemingly Windows updates).

I used global de-duplication (currently at 2.4x de-duplication rate which also strikes me as very low given that most data is just the same Windows install).

In the past year, backup transfers have become incredibly slow (<1Mb/s).

During backups, the volume utilization is at 100% which slows down every other process on the NAS, including SMB access. RAM utilization is only at around 50%.

 

[Cyberwasp]

I know this is a lame answer but I'm old school. Have you defragmented the volumes. turning off memory compression may help also.

 

[Rusty]

Could it be a lot of versions causing rotations and deletions?

 

[Walter]

The DS918+ has a rather slow CPU. But you said volume utilization is at 100% What type of RAID do you use?

 

[Lewis]

Are all backups happening at same time/schedule ? Maybe spread them apart like every hour only 2-3 machines or so across the day ?

 

[tree4939]

I use RAID1. I have already limited the number of concurrent backups to 3 machines, but it's still excessively slow.

The Synology Support said the it may be due to high availability. I'm going to induce a split brain next week during rush hour and see whether that speeds things up.

 

[tree4939]

It looks like I did not have enough RAM: Active Backup for Business Technical Details | Synology Inc.

After I upgraded to 8 GB of RAM, it worked better, presumably because global deduplication requires a lot of RAM?

 

[Gerard]

It looks like I did not have enough RAM: Active Backup for Business Technical Details | Synology Inc.

After I upgraded to 8 GB of RAM, it worked better, presumably because global deduplication requires a lot of RAM?

How much ram did you initially have?

 

[tree4939]

How much ram did you initially have?

I had 4 GB initially.