Hi there,
hopefully somebody with a similar configuration can give me some information.
I'm asking because i'm not sure if it's a failure or just normal.
Components
- 27" iMac (late 2013 with SSD)
- AirPort TimeCapsule Model A1470 (802.11ac) with a 2TB Drive
- Distance between iMac and TC about 10 feet - clear range - so best requirements (imho)
I only get these speeds while copying a file (1-6GB) from iMac directly (peer 2 peer without any switches) to the TC
Transfer by WLAN (PHY-Modus: 802.11ac)
Write: 28.1 MB/s
Read: 27.1 MB/s
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Transfer by LAN (1GBIT Connection)
Write: 42.7 MB/s
Read: 53.0 MB/s
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Both seems to me very slow.
But maybe i forgot some key information about transfers.
Here's my thought (sorry for this bad english - but it's not my native language)
1) 802.11ac means transfer rates (theoretically) of 1300Mbit/s.
Because of bidirectional it's the half. So 650Mbit/s - deducting the protocol information (about 10%-20%) there must be a regular speed about 520Mbit/s --> 65MB/s
As i said - i get a WLAN-Speed of max. 28MB/s - lack of 37MB/s or more than 50%
2) As you can see, the transfer rate connected by gigabit cable is also slow about 40-50MB/s - but here is 1Gbit/s (128MB/s) a real speed - not just theoretically as WLAN
So i got a lack of about 50-70MB/s
I had a QNAP since 2012 - and the transfer rate from the same iMac trough a HP ProCurve Switch to the QNAP was always about 110MB/s (just the standard of gigabit connection!)
3) I read the specification of SATA2 - where the HDD of the TC is connected. SATA2 is about 3Gbit/s (384MB/s). So the SATA2 couldn't be the bottleneck. (imho)
4) i found a test of the (allegedly) attached HDD in the TC. It's a Seagate Barracuda ST2000 which never got less transfer rates than 90MB/s
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Now my questions - according to the numbering above
1) Do you got the same worse WLAN transfer speed about 28MB/s?
2) Do you got the same worse LAN transfer speed using gigabit cable about 50MB/s? Why is the transfer rate so less? (compared to my QNAP transfer rate)
3) Does a hard disc change improve the transfer speed - or is 50MB/s "normal" speed?
4) Is it normal that the HDD got a transfer rate of 90MB/s and above when it's internal connected to a PC and such a transfer loss of nearly 50% when its attached to a TC?
5) Is there any possibility to read out the disk information used in my TC. Hopefully theres a tool - i don't want to screw up the TC - it got still guarantee.
Thanks in advance for any information - and again - sorry for bad english.
hopefully somebody with a similar configuration can give me some information.
I'm asking because i'm not sure if it's a failure or just normal.
Components
- 27" iMac (late 2013 with SSD)
- AirPort TimeCapsule Model A1470 (802.11ac) with a 2TB Drive
- Distance between iMac and TC about 10 feet - clear range - so best requirements (imho)
I only get these speeds while copying a file (1-6GB) from iMac directly (peer 2 peer without any switches) to the TC
Transfer by WLAN (PHY-Modus: 802.11ac)
Write: 28.1 MB/s
Read: 27.1 MB/s
Transfer by LAN (1GBIT Connection)
Write: 42.7 MB/s
Read: 53.0 MB/s
Both seems to me very slow.
But maybe i forgot some key information about transfers.
Here's my thought (sorry for this bad english - but it's not my native language)
1) 802.11ac means transfer rates (theoretically) of 1300Mbit/s.
Because of bidirectional it's the half. So 650Mbit/s - deducting the protocol information (about 10%-20%) there must be a regular speed about 520Mbit/s --> 65MB/s
As i said - i get a WLAN-Speed of max. 28MB/s - lack of 37MB/s or more than 50%
2) As you can see, the transfer rate connected by gigabit cable is also slow about 40-50MB/s - but here is 1Gbit/s (128MB/s) a real speed - not just theoretically as WLAN
So i got a lack of about 50-70MB/s
I had a QNAP since 2012 - and the transfer rate from the same iMac trough a HP ProCurve Switch to the QNAP was always about 110MB/s (just the standard of gigabit connection!)
3) I read the specification of SATA2 - where the HDD of the TC is connected. SATA2 is about 3Gbit/s (384MB/s). So the SATA2 couldn't be the bottleneck. (imho)
4) i found a test of the (allegedly) attached HDD in the TC. It's a Seagate Barracuda ST2000 which never got less transfer rates than 90MB/s
Now my questions - according to the numbering above
1) Do you got the same worse WLAN transfer speed about 28MB/s?
2) Do you got the same worse LAN transfer speed using gigabit cable about 50MB/s? Why is the transfer rate so less? (compared to my QNAP transfer rate)
3) Does a hard disc change improve the transfer speed - or is 50MB/s "normal" speed?
4) Is it normal that the HDD got a transfer rate of 90MB/s and above when it's internal connected to a PC and such a transfer loss of nearly 50% when its attached to a TC?
5) Is there any possibility to read out the disk information used in my TC. Hopefully theres a tool - i don't want to screw up the TC - it got still guarantee.
Thanks in advance for any information - and again - sorry for bad english.