Herman Eggink
Explorer
- Joined
- Jan 27, 2014
- Messages
- 73
My freenas box has 4 2TB drives (ZFS mirrored), running 9.2.1.7. Although mirrored, I wanted an off-site backup in case anything happens to the box (or the house) and to have a backup in the first place (home foto's/videos that are irreplaceable).
Since this data is not very volatile, I can live with manual backups after special occasions (vacations) where the backups are essentially copies (no need for timestamps).
I ended up choosing chrashplan backing up to a local 3T esata disk (formatted NTFS for more flexibility if I lose the freenas box) that I store with a friend in our area.
Where I am struggling is that the backup is only 1.2TB yet takes nearly a day. The backup averages (acc to the crashplan console) somewhere between 145 and 170Mbps. Freenas reporting tells me that the NTFS drive writes at 20MB/sec where the 4 source drives provide around 5-10MB in read each and the CPU performance not exceeding 40% (even tho crashplan is configured to go to 100%).
I used iostat to get a feel for the drives's throughput. Running iostat on the target NTFS drive bumped write up to 50MB/s on the freenas console (ie it is not maxed out under crashplan). Weirdly enough, the read performance on the source disk hardly go above the 10MB/s when I run iostat on them.
It sounds a bit odd to me that the read performance on the internally mirrored disks would be the bottleneck.
[EDIT] just noticed that the read performance is much higher as sabnzbd bumped it up to nearly 60 MB/s so it should definitely not be the bottleneck.
Really appreciate you insight.
Since this data is not very volatile, I can live with manual backups after special occasions (vacations) where the backups are essentially copies (no need for timestamps).
I ended up choosing chrashplan backing up to a local 3T esata disk (formatted NTFS for more flexibility if I lose the freenas box) that I store with a friend in our area.
Where I am struggling is that the backup is only 1.2TB yet takes nearly a day. The backup averages (acc to the crashplan console) somewhere between 145 and 170Mbps. Freenas reporting tells me that the NTFS drive writes at 20MB/sec where the 4 source drives provide around 5-10MB in read each and the CPU performance not exceeding 40% (even tho crashplan is configured to go to 100%).
I used iostat to get a feel for the drives's throughput. Running iostat on the target NTFS drive bumped write up to 50MB/s on the freenas console (ie it is not maxed out under crashplan). Weirdly enough, the read performance on the source disk hardly go above the 10MB/s when I run iostat on them.
It sounds a bit odd to me that the read performance on the internally mirrored disks would be the bottleneck.
[EDIT] just noticed that the read performance is much higher as sabnzbd bumped it up to nearly 60 MB/s so it should definitely not be the bottleneck.
Really appreciate you insight.
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