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Forum Discussion
Dramatic performance decrease - FIXED
I'm at my wits end troubleshooting this and am hoping for a little help. :D I have a Netgear ReadyNAS Duo and have been running it for a couple of days with little incident. I posted on another thread it took 23 hours to do a backup to an attached USB drive, which I am guessing is about normal for 811GB. In any case, those 811GB got to my NAS by copying them from my PC, and I was seeing 20MB/sec speeds (on the Windows copy window). Today, for some reason, the performance has dropped to sometimes 500K per second! It starts off at 20MB/sec, but then after 10-15 seconds it starts to drop to 10 almost immediately, and from there slowly until it gets to sub 1MB/sec.
I have been playing with a lot of stuff (turning services on and off) and also got done upgrading my PC (installed an SSD), so I am at a complete loss as to what could have caused this. I read the post on troubleshooting, and ran Iometer. Interestingly it shows 32MB/seconds read and 14.5MB/sec write. The write seems a little slow, but it doesn't explain the dramatic performance decrease in Windows copy.
I connected my PC straight to the switch, I rebooted the NAS, turned off all the streaming services I had turned on, and even restored a backup from the day before yesterday onto my PC. Nothing. I tried all the suggestions in the sticky. Can I get some suggestions (and perhaps kind words of encouragement? :D ) Here is all the other relevant information:
NetGear NAS Duo
RAIDiator 4.1.8-T9
RAIDar 4.3.2
Volume C: X-RAID, 2 disks, 44% of 1846 GB used
Status: Online / 1000 Mbit / Full-Duplex
Show errors: TCP retransmits 51, Unrecovered TCP retransmits 42, everything else 0
Speed duplex mode: auto
MTU: 7936
Jumbo Frames enabled
CIFS: enabled
NFS: disabled
AFP: enabled, advertise AFP over Bonjour
FTP: enabled
HTTP: disabled
HTTPS: enabled
Rsync: disabled
Streaming services: all disabled
Discovery services: Bonjour enabled (AFP only), UPnP enabled
Installed Add-ons: disabled except ReadyNAS remote
Performance: everything checked
Status: green
Drives: Seagate ST2000DL003-9VT166 1862 GB, 44C / 111F, write-cache ON
Seagate ST2000DL003-9VT166 1862 GB, 42C / 107F, write-cache ON
Fan 1: 1666 RPM
UPS 1: APC Back-UPS ES 550, Battery charge: 100%, 37 minutes
Copying from a Dell 720H2C running Windows 7 Ultimate x64, 4GB RAM, QX6850 @ 3.67HGz, Broadcom GigE integrated NIC 57XX
PC and NAS connected to D-Link DGS=1024D 24-port gigabit switch, firmware unknown (purchased last week).
System logs are available, but I'd rather not post them here. Is there somewhere I can send them or can I PM a link to a moderator?
Help!
Thanks.
EDIT: I should add that after all the troubleshooting, and after I typed this post, I decided to start a copy of 97GB and just leave it there overnight, and it started transferring at 10MB/sec. About 45-60 seconds into the copy, the speed starts to slowly decrease to 5MB/second -- 4MB/second -- 3MB/second (as I type this... :( ) so I went into FrontView and in show errors. it shows 54 TCP retransmits / 42 unrecovered. just about the same as I reported above. I also stopped the ReadyNAS Remote service before I started this last copy as an additional troubleshooting step.
EDIT #2: A little more troubleshooting - copying OFF the NAS is working fine. I get 25-26MB/second reading off the NAS and copying onto my PC. So the problem seems to be WRITING to the NAS.
I have been playing with a lot of stuff (turning services on and off) and also got done upgrading my PC (installed an SSD), so I am at a complete loss as to what could have caused this. I read the post on troubleshooting, and ran Iometer. Interestingly it shows 32MB/seconds read and 14.5MB/sec write. The write seems a little slow, but it doesn't explain the dramatic performance decrease in Windows copy.
I connected my PC straight to the switch, I rebooted the NAS, turned off all the streaming services I had turned on, and even restored a backup from the day before yesterday onto my PC. Nothing. I tried all the suggestions in the sticky. Can I get some suggestions (and perhaps kind words of encouragement? :D ) Here is all the other relevant information:
NetGear NAS Duo
RAIDiator 4.1.8-T9
RAIDar 4.3.2
Volume C: X-RAID, 2 disks, 44% of 1846 GB used
Status: Online / 1000 Mbit / Full-Duplex
Show errors: TCP retransmits 51, Unrecovered TCP retransmits 42, everything else 0
Speed duplex mode: auto
MTU: 7936
Jumbo Frames enabled
CIFS: enabled
NFS: disabled
AFP: enabled, advertise AFP over Bonjour
FTP: enabled
HTTP: disabled
HTTPS: enabled
Rsync: disabled
Streaming services: all disabled
Discovery services: Bonjour enabled (AFP only), UPnP enabled
Installed Add-ons: disabled except ReadyNAS remote
Performance: everything checked
Status: green
Drives: Seagate ST2000DL003-9VT166 1862 GB, 44C / 111F, write-cache ON
Seagate ST2000DL003-9VT166 1862 GB, 42C / 107F, write-cache ON
Fan 1: 1666 RPM
UPS 1: APC Back-UPS ES 550, Battery charge: 100%, 37 minutes
Copying from a Dell 720H2C running Windows 7 Ultimate x64, 4GB RAM, QX6850 @ 3.67HGz, Broadcom GigE integrated NIC 57XX
PC and NAS connected to D-Link DGS=1024D 24-port gigabit switch, firmware unknown (purchased last week).
System logs are available, but I'd rather not post them here. Is there somewhere I can send them or can I PM a link to a moderator?
Help!
Thanks.
EDIT: I should add that after all the troubleshooting, and after I typed this post, I decided to start a copy of 97GB and just leave it there overnight, and it started transferring at 10MB/sec. About 45-60 seconds into the copy, the speed starts to slowly decrease to 5MB/second -- 4MB/second -- 3MB/second (as I type this... :( ) so I went into FrontView and in show errors. it shows 54 TCP retransmits / 42 unrecovered. just about the same as I reported above. I also stopped the ReadyNAS Remote service before I started this last copy as an additional troubleshooting step.
EDIT #2: A little more troubleshooting - copying OFF the NAS is working fine. I get 25-26MB/second reading off the NAS and copying onto my PC. So the problem seems to be WRITING to the NAS.
6 Replies
Replies have been turned off for this discussion
- i too have started having reduced speeds when copyin to the readynas duo, i have just installed a virginmedia superhub an since doing so my speeds dropped to around 4mb, on my previous set up i always got 25mb give or a take a bit. Like you tho when i copy from the nas drive to the pc i get full speed, around 25mb/s but when copyin to the nas i get around 4mb/s.
it seems odd to me as both the ready nas duo an the virginmedia superhub CG3101D are both made by netgear. - After reading alot an messing with settings i found that disabling jumbo frames on my network card and on the readynas duo itself improved things somewhat.
My transfer rate now when copying to the nas drive is around 22 - 26mb/s and when copying from the nas to the pc its around 30 - 37mb/s.
From what i understand of using the jumbo frames settings the hardware must support it and from what ive read alot of routers dont.
It might be worth trying disabling this an see if it helps . - You can also try directly connecting the PC to the NAS; that will tell you if the router / switch have anything to do with the performance drop.
- Thanks for the suggestions guys. Some additional troubleshooting narrowed down the problem to my PC I think.
I have two PCs capable of wired gigabit connections, and one of them writes fine (its about 16MB/sec, but that's reading off a USB drive, so I call that a win).
The one that all of a sudden is giving me problems I just upgraded the internal HD to a SSD and restored the Windows 7 image onto it. Somewhere in that process I am thinking something in the network configuration (NIC drivers or settings) is not right. I think it is using a generic nic driver, and it is not giving me a lot of options to configure. It shows as a Broadcom NetXtreme 57xx Gigabit Controller, and I only get these options:
Flow control: disabled
Priority & VLAN: Priority & VLAN enabled
Proxy ARP Offload: enable
Proxy NS Offload: enable
Speed & Duplex: auto
VLAN ID: 0
The other PC has an Intel embedded NIC and the driver give me a LOT of more options.
I am thinking some of these options are set incorrectly. I was messing with them but I have no idea what I am doing. Any ideas?
Thanks!
EDIT: I downloaded and installed the latest version of the Broadcom driver from the Broadcom site. It gave me something slightly different, but it had no effect. My options now are:
ARP Offload: enable
Flow control: Auto
NS Offload: enable
Priority & VLAN: Priority & VLAN enabled
Speed & duplex: auto
VLAN ID: 0
Wake Up-Capabilities: Both (Magic packet and wake up frame)
As additional troubleshooting steps I reinstalled the firmware and restored the NAS to defaults. I am now testing that 23 hour backup I did to see how it works :) I connected the USB drive onto the other PC and it's chugging along copying the files back to the NAS merrily at about 16MB/second. I'm pretty convinced at this point its not NAS related. - Try changing the flow control setting. I had problems with onboard NIC settings so I eventually installed an Intel 1000PT - works fine.
- Yup, I think it was the settings. After doing a full NAS restore from backup, replacing a failed drive in the recently upgraded PC (completely unrelated to all of this) I did some copying from the PC to the NAS, and I am hitting 17MB/second, which was what I was originally getting. This is from an attached USB drive on the PC onto the NAS. As soon as that copying is done I'll try from the new SSD onto the NAS to see if that improves things any, but as it stands now, I will call this one fixed. Thanks!!! :D
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