I am migrating about 40TB+ from a Synology NAS to Unraid. I have the mounted the Synology on Unraid with unassigned devices. However the transfer speed averages around 30MB/s no matter what I tried. I think it might be a problem with SMB or networking. All devices are connected to a single managed switch. Things that I have tried: 1. I have tried both with cache enabled and cache disabled on the target user share. 2. I have also tried to transfer to a cache-only folder (appdata folder) but speed also remains the same (ave 30MB/s). 3. I ran iperf3 between Unraid, Synology NAS, Router (pfsense), as well as my computer. All tests achieve 950+ MB/s. So it's not a network problem. 4. Tested array with DiskSpeed container. Slowest drive average 138 MB/s and fastest drive average 286 MB/s with a simultaneous max throughput of 1.52 GB/s. Therefore it is not a drive or the controller problem. 5. Tried copying with Krusader, Double Commander, as well as Dynamix File Manager. No difference in speed. 6. In Tips and Tweaks, I have tried (one at a time) disbling NIC Flow Control and NIC Offload. I have also increased Rx and Tx buffer to 1024. Still no changes to transfer speed. 7. Previously I had this Samba extra configuration: #server multi channel support = no server min protocol = SMB3_02 client ipc min protocol = SMB3_11 client NTLMv2 auth = yes restrict anonymous = 2 null passwords = no raw NTLMv2 auth = no #vfs_fruit compatibility for Apple SMB [global] vfs objects = catia fruit streams_xattr fruit:nfs_aces = no fruit:zero_file_id = yes fruit:encoding = native spotlight backend = tracker fruit:metadata = stream fruit:posix_rename = yes readdir_attr:aapl_max_access = no readdir_attr:aapl_finder_info = no readdir_attr:aapl_rsize = no but now I have also removed all of it and Samba extra configuration is empty. 8. I have tried toggling Tunable (enable Direct IO) and reconstruct write. 9. I have also tried removing parity drive and writing directly to the unprotected array. It made no difference to the transfer speed. So I have now rebuilt parity and chose to do the migration with parity protection. 10. I also tried mounting the Unraid share in Synology and doing the transfer on Synology. But the speed was even worse at around 20MB/s. 11. Tried mounting the Synology share using NFS instead of SMB but it made no difference. 12. Doing a transfer speed test from my Mac to Unraid using Blackmagic Disk Speed Test always give random results. Sometimes it achieve full 100MB/s but most other times it is way less around 10-20 MB/s. The same test to Synology share always gets 100MB/s. The only thing I am hesitant to try is modifying docker network setting as it would require changing all of my container network settings to match. Currently I have macvlan + host access to custom network enabled. I am out of ideas of what to do. Please give me some suggestions on what else to try as 40TB+ transfer at 30MB/s would take a couple weeks instead of days. tower-diagnostics-20240906-1019.zip

Need help diagnosing slow copy from mounted smb share into array.

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September 9, 20241 yr

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I saw a comment on another forum for I226-V stability issues suggesting to turn off all aspm settings in bios. That fixed the issue for me.

Transfer speed using the Intel I226V is back to full speed for me now.

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4 months later...

January 24, 20251 yr

I would love to get the speeds people complain about here. When I copy from unraid shares i get 600kb/sec! Cache or no it should never be this slow.

Edited January 24, 20251 yr by Mech4nimaL

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January 24, 20251 yr

Community Expert

54 minutes ago, Mech4nimaL said:

I would love to get the speeds people complain about here. When I copy from unraid shares i get 6kb/sec! Cache or no it should never be this slow.

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Need help diagnosing slow copy from mounted smb share into array.

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