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Forum Discussion
Writes fall to zero bytes after a few seconds
Every time I try to copy a file to the NAS, it starts out fine and then the writes fall to 0 bytes and then eventually errors out... on the latest firmware. A reboot seems to fix the issue for a whil...
enkrypt3d wrote:
just realized the pro 4 is only SATA II so now I'm thinking of getting a 2nd one that is a bit beefier... and use the pro 4 as a backup...
SATA II can handle 300 MB/sec - which is a lot faster than your disks (and your network). So you won't see any performance gain with SATA III - SATA isn't the bottleneck. Though of course the pro 4 is older, so you might consider repurposing it for backup anyway.
If you are looking for an upgrade, perhaps get a NAS with more slots, so you could add a couple of SSDs (either using ReadyTier or just creating a smaller SSD volume for selected shares).
If you go with an RN520 or RN620 series you could also look into getting a multigig switch with at least one 10 gb port. Then you could potentially upgrade a PC or two, and speed up your network. Those switches are expensive though.
Yes I have it running with 2 x 1Gbps in LACP but it never uses the 2nd link even with my PC in a LAG on the same switch... I was looking at the
AR ReadyNAS 2304 as an upgrade but I didn't know if I could just swap the drives over and be all set....
The SATA speeds matter since I'm running things like plex, and other services that can thrash the drives local to the NAS... I'm going to test the throughput tonight with some bandwidth tests now that it's done syncing. I can tell a huge difference in plex performance over the old drives which were 5400... the new drives are 7200 RPM :)
Still seeing the same writing performance... what a bummer... sometimes it falls to 0 bytes and other times it spikes to 45MB/s which is terrible... like I said I used to be able to write 112MB/s steady without issue... Already ruled out the switch and PC networking issues......
enkrypt3d wrote:
The SATA speeds matter since I'm running things like plex, and other services that can thrash the drives local to the NAS...
Mechanical disks are slower that 300 MB/s (SATA II).
enkrypt3d wrote:
Yes I have it running with 2 x 1Gbps in LACP but it never uses the 2nd link even with my PC in a LAG on the same switch... )
Yes. That's how LACP works. Each flow is assigned to a NIC (depending on the xmit hash), so it won't split the flow across two links.
A static lag using round-robin in the NAS would use both NICs, but the packet loss might reduce your performance with other PCs.
I'm using bonding mode 4 on the NAS and yes I'm aware that single stream copies won't saturate both gig links unfortunately....
So if I get the other unit can I just take the drives out and put them into the 2304 without having to copy the data across? I want to put the 4 x 8TB drives in the pro 4 and the 4 x 14TB drives in the 2304....
Since you are already running OS6 on your Pro4, then yes, you can just move the drives over. Since you are going from an Intel based NAS to another Intel based one, you don't even need to do anything about apps.
Good news - got the 2304 setup and it performs just like the pro 4 used to at 112MB/s steady...... the pro 4 still has performance issues. I have the 4 x 8TB drives in the pro 4 syncing now and the 4 x 14TB drives in the 2304 which seems to be running well...
So I still can't figure out why the pro 4 is having this issue.
yea this was before the sync began... I also setup a ReadyDR job to sync from the 2304 to the Pro 4 and it's copying data but the files on the Backup nas (Pro 4) are not browsable?
root@NAS:/BACKUP# du -sh *
0 backup
0 home
0 MediaIn the jobs view it says it has copied 90GB but I see nothing in the volume folder itself.... where is this data going?
enkrypt3d wrote:
I also setup a ReadyDR job to sync from the 2304 to the Pro 4 and it's copying data but the files on the Backup nas (Pro 4) are not browsable?
root@NAS:/BACKUP# du -sh *
0 backup
0 home
0 MediaIn the jobs view it says it has copied 90GB but I see nothing in the volume folder itself.... where is this data going?
ReadyDR creates snapshots. I don't use it, so I don't know details on how to see them. But try
# btrfs subvolume list -s /data
(changing /data if your volume is named something else). That should show the paths to all the snapshots on the volume.
enkrypt3d wrote:yea this was before the sync began... I also setup a ReadyDR job to sync from the 2304 to the Pro 4 and it's copying data but the files on the Backup nas (Pro 4) are not browsable?
Yes, that is by design (of the underlying BRTFS send-receive protocol). It only replicates snapshots. You have to use the gear menu for the share and select Clone to create a usable share from one of the snapshots, just as you can from any snapshot. Note that Clone doesn't copy the files, it just creates a normal share with duplicate pointers to the contents of the snapshot, so it doesn't eat up space. But it's tied to the specific snapshot you cloned and will not reflect changes on the source made after the clone operation, which are in a different snapshot.
Thus ReadyDR is not the right way to go if you want to create an immediately-usable alternate location in the event your main NAS fails. Rsync jobs are better for that.
I have found only one place where ReadyDR is better than Rsync jobs -- for shares containing virtual drives or encrypted containers (like from Veracrypt). With those types of files, Rsync sees any small change as a file change, so it backs up the whole updated file. ReadyDR only sees the specific inode changes and only backs those up. So it's faster and doesn't use up as much space (assuming you have snapshots enabled on the backup share). I have all of that type of file in one share so i can back that share up with ReadyDR and I have also turned off Strict Sync, which speeds up normal handling of such files (especially VeraCrypt).
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