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What data transfer rate should I expect from a NAS?

Discuss What data transfer rate should I expect from a NAS? at the Media & Streaming Players within the HiFiVision.com - Audio Video Hi-Fi Forum; I have a Seagate Blackarmor 220 NAS with RAID enabled. I find it EXTREMELY slow ...

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Old 28th March 2012, 08:21 AM
 
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What data transfer rate should I expect from a NAS?


I have a Seagate Blackarmor 220 NAS with RAID enabled. I find it EXTREMELY slow in all its operations, be it read, write or even simply opening its own web page.

For example, it takes 30 minutes to copy a 7GB file across a 1GBPS network in single process mode. Would anyone be able to tell me whether this is all I can expect from a NAS or whether this is particularly bad.

Regards,

V Shankar
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Old 28th March 2012, 08:52 AM
 
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Re: What data transfer rate should I expect from a NAS?

Are you transferring a single file or 7 GB or several small files ?

If you are transferring a single file, the speed is somewhat low. I am using a buffalo router as nas with a WD 500 GB usb drive and my speeds are about 7 MBps for big files over 1 Gbps ethernet while doing an smb transfer.

A dedicated NAS should do better.
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Old 28th March 2012, 09:09 AM
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Re: What data transfer rate should I expect from a NAS?

How are you copying the file?

Is it ftp or SMB share or NFS? Are you using wireless or wired network? Is there a hub or switch in between the two? There are too many variables. Could you provide more details about your setup?

I get about 40-50 MBPS from my synology NAS over sftp on a wired network.

Cheers,

Saurabh
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Old 28th March 2012, 09:20 AM
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Re: What data transfer rate should I expect from a NAS?

That is terribly slow actually, but the transfer speeds will depend on a lot of other factors;

1) It will never be above the slowest element of your connection--so if you're reading from/writing to a 5200rpm HDD, the overall transfer rate won't go over 20-25MBps no matter what..around 50-60 for 7200rpm HDDs.

3) Cabling--Make sure you're using Cat6

Otherwise, as I said..you should be looking at achieving atleast 20MBps transfer speeds with your setup. So, a little less than 6 minutes for that 7GB file. Something is definitely wrong, but I can't say anything more before knowing more about your whole setup.
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Old 28th March 2012, 09:49 AM
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Re: What data transfer rate should I expect from a NAS?

Quote:
Originally Posted by kumarab View Post
That is terribly slow actually, but the transfer speeds will depend on a lot of other factors;

1) It will never be above the slowest element of your connection--so if you're reading from/writing to a 5200rpm HDD, the overall transfer rate won't go over 20-25MBps no matter what..around 50-60 for 7200rpm HDDs.
I think the speed should still be faster as the OP is using RAID and not a single disk.

Quote:
Originally Posted by kumarab View Post
3) Cabling--Make sure you're using Cat6
CAT5 is still certified for 100 mbps, which is much faster than the transefer rate.

Quote:
Originally Posted by kumarab View Post
3)Otherwise, as I said..you should be looking at achieving atleast 20MBps transfer speeds with your setup. So, a little less than 6 minutes for that 7GB file. Something is definitely wrong, but I can't say anything more before knowing more about your whole setup.
I think a good point to check would be if cache is enabled on the disk, or if there is any data transfer limit imposed by the NAS.

Cheers,

Saurabh
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Old 28th March 2012, 10:16 AM
 
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Re: What data transfer rate should I expect from a NAS?

Thanks everyone for the initial responses. My objective is to decide whether it is the NAS box that is at fault in which case I need to replace it with something else.

Here are answers to questions by various posters:
1. Single file. Several files are processed sequentially unless I explicitly open several sessions. Several sessions seems to degrade, even in read mode when the mirroring is actually supposed to help.
2. All wired connection. Cat5 (though as someone pointed out, the CAT5 speed limit is far higher than actual speeds achieved). (On WiFi takes HOURS to copy a 7GB file).
3. There is a Cisco 1GB switch in between, though that does not seem to affect PC to PC transfer rates. It is only NAS to PC that is affected.
4. Using 5200RPM disks as the enclosure is small and want to reduce heat buildup.
5. Copying using NFS.

If I did wish to replace the device, what is a high performance NAS with RAID and DLNA server support?

Regards,
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Old 28th March 2012, 10:17 AM
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Re: What data transfer rate should I expect from a NAS?

@dazoy
* "Slowest element"..what's he writing to?
* 100Mbps is 12.5MBps of a theoretical maximum, much lesser in real world, stables out at around 8-8.5 for most people.

Other than that, yes..as I already mentioned, he is still getting terribly slow speeds..and that should be looked into.
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Old 28th March 2012, 10:35 AM
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Re: What data transfer rate should I expect from a NAS?

@shankar

Thanks for the details--

*This seems to suggest an FTP process--you should look deeper into the seetings

*Atleast get Cat5e, if not Cat6. On a Cat5 cable..your 7GB file will take around 15 minutes under ideal conditions anyway. Still less than your 30 minutes, but it is a bottleneck nonetheless.

*You should check the Cisco manual--there is a difference between supporting a bandwidth 10/100/1000 and being "certified" for it.

*As I said, those limit you to a 20-25 MBps real world speeds anyway. Also, although you haven't specified..if you're using RAID0, then expect to see double speeds when writing to /reading from the HDD IN the Raid config.

*Lastly--Again, it all depends on the slowest element. If you're reading from your RAID'ed drives but writing to a 5200rpm drive on your PC..you'll still get a maximum of 20-25MBps. If a Cat5 cable is used, don't expect to see anything more than an average of 8.5MBps..so on and so forth.
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Old 28th March 2012, 12:14 PM
 
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Re: What data transfer rate should I expect from a NAS?

Quote:
Originally Posted by shankar@shankar.biz View Post
3. There is a Cisco 1GB switch in between, though that does not seem to affect PC to PC transfer rates. It is only NAS to PC that is affected.
Can you check the speed/duplex settings of the port in your cisco switch where the NAS is connected ? Both the switch port and NAS port settings should match. Also check the cisco switch logs to see if there is any error messages for the port where NAS is connected
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Old 28th March 2012, 04:50 PM
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Re: What data transfer rate should I expect from a NAS?

Quote:
Originally Posted by kumarab View Post
@dazoy
* "Slowest element"..what's he writing to?
* 100Mbps is 12.5MBps of a theoretical maximum, much lesser in real world, stables out at around 8-8.5 for most people.

Other than that, yes..as I already mentioned, he is still getting terribly slow speeds..and that should be looked into.
I did not quite catch your comment about slowest element above. Is that a question to me??


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