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Re: USB3 full backup slow to the point of unusable
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Re: USB3 full backup slow to the point of unusable
I had hoped to get a bit closer to the potential 5gbps (640 MB/s) that USB 3.0 promises, even with CPU factor and other overhead. When upcoming 6.5.0 release becomes available, I will measure throughput on RN516 (with faster CPU as RN312) also.
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Re: USB3 full backup slow to the point of unusable
@dsnpevl wrote:
I had hoped to get a bit closer to the potential 5gbps (640 MB/s) that USB 3.0 promises, even with CPU factor and other overhead. When upcoming 6.5.0 release becomes available, I will measure throughput on RN516 (with faster CPU as RN312) also.
USB 3.0 has a link speed of 5 gbps, but each byte is encoded as 10 bits, so the raw transfer speed is 500 MB/s, not 640. However, there is overhead in the protocol, and the theoretical transfer speed limit with 3.0 for disks is 450 MB/s.
USB 3.1 Gen-2 has a link speed of 10 gbps and lower overhead. A USB Gen-2 drive has a theoretical transfer speed limit of 1.1 GB/sec.
But in the real world, if you are using a mechanical USB 3.0 drive, your top speed is limited by the drive - usually around 125 MB/sec in a typical 3.5" USB 3.x drive. Even if you use fast SSDs/flash, the fastest USB speeds I've seen in reviews is ~400 MB/sec. Getting 95 MB/sec speeds in a ReadyNAS with NTFS is really very good, esp. since NTFS isn't a natively supported file system for linux.
http://www.everythingusb.com/speed.html
FWIW ReadyNAS USB ports are spec'ed as USB 3.0 (if they do support USB 3.1 Gen-2, it's not on the the datasheets).
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Re: USB3 full backup slow to the point of unusable
@StephenB wrote:
Getting 95 MB/sec speeds in a ReadyNAS with NTFS is really very good, esp. since NTFS isn't a natively supported file system for linux.
Thnx for explaining the technical details!
I'll adjust my expectations accordingly.
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Re: USB3 full backup slow to the point of unusable
@mdgm wrote:Thanks for your patience.
There is a fix in ReadyNASOS 6.5.0 (RC2). The production 6.5.0 firmware is currently expected to be released early/mid May.
Is there any update re early/mid?
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Re: USB3 full backup slow to the point of unusable
@Michael_Oz wrote:
Is there any update re early/mid?
RC3 was released yesterday. I have no inside info (I don't work for Netgear), but I'd expect this to be the last beta - unless they find something unexpected that simply has to be fixed.
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Re: USB3 full backup slow to the point of unusable
One of the newer RC builds (2 or 3) should have an enhancement using NTFS.
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