Are external USB drives on separate USB buses faster?
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Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?
usb external-hdd lsusb
asked Apr 2 at 4:14
Geremia
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Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?
usb external-hdd lsusb
asked Apr 2 at 4:14
Geremia
509716
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?
usb external-hdd lsusb
asked Apr 2 at 4:14
Geremia
509716
Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?
usb external-hdd lsusb
asked Apr 2 at 4:14
Geremia
509716
asked Apr 2 at 4:14
Geremia
509716
asked Apr 2 at 4:14
Geremia
509716
asked Apr 2 at 4:14
Geremia
509716
509716
add a comment |Â
add a comment |Â
1 Answer
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Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.
So the answer is: it depends.
Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?
answered Apr 2 at 6:34
dirkt
14k2930
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
Look atlsusb -t.
– dirkt
Apr 2 at 18:24
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.
So the answer is: it depends.
Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?
answered Apr 2 at 6:34
dirkt
14k2930
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
Look atlsusb -t.
– dirkt
Apr 2 at 18:24
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
add a comment |Â
up vote
1
down vote
Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.
So the answer is: it depends.
Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?
answered Apr 2 at 6:34
dirkt
14k2930
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
Look atlsusb -t.
– dirkt
Apr 2 at 18:24
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
add a comment |Â
up vote
1
down vote
up vote
1
down vote
Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.
So the answer is: it depends.
Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?
answered Apr 2 at 6:34
dirkt
14k2930
Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.
So the answer is: it depends.
Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?
answered Apr 2 at 6:34
dirkt
14k2930
answered Apr 2 at 6:34
dirkt
14k2930
answered Apr 2 at 6:34
dirkt
14k2930
answered Apr 2 at 6:34
dirkt
14k2930
14k2930
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
Look atlsusb -t.
– dirkt
Apr 2 at 18:24
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
add a comment |Â
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
Look atlsusb -t.
– dirkt
Apr 2 at 18:24
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
"two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
– Geremia
Apr 2 at 17:47
Look at
lsusb -t.– dirkt
Apr 2 at 18:24
Look at
lsusb -t.– dirkt
Apr 2 at 18:24
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
It appears they're all part of "Class=root_hub".
– Geremia
Apr 2 at 22:16
add a comment |Â
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