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#1 2008-09-09 01:04:42

konst
New member
Registered: 2008-09-07
Posts: 1

Very slow write speeds in Leopard (USB)

Hello, I am getting max ~2.3MB/s write speed with dns-313 attached directly to my macbook(OSX 10.5.4), while read speeds are more reasonable:

Code:

# mkfile 100M foo
# sync
# rsync --progress foo /Volumes/test/
foo
   104857600 100%    2.35MB/s    0:00:42 (xfer#1, to-check=0/1)

sent 104870480 bytes  received 42 bytes  2356640.94 bytes/sec
total size is 104857600  speedup is 1.00
# sync
# rsync --progress /Volumes/test/foo .
foo
   104857600 100%   45.17MB/s    0:00:02 (xfer#1, to-check=0/1)

sent 104870480 bytes  received 42 bytes  41948208.80 bytes/sec
total size is 104857600  speedup is 1.00

However with my linux box:

Code:

# dd if=/dev/zero of=foo bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.25508 s, 83.5 MB/s
# sync
# rsync --progress foo /mnt/dlink/
foo
   104857600 100%   20.83MB/s    0:00:04 (xfer#1, to-check=0/1)

sent 104870464 bytes  received 31 bytes  19067362.73 bytes/sec
total size is 104857600  speedup is 1.00
# sync
# rsync --progress /mnt/dlink/foo .
foo
   104857600 100%   40.04MB/s    0:00:02 (xfer#1, to-check=0/1)

sent 104870464 bytes  received 31 bytes  29962998.57 bytes/sec
total size is 104857600  speedup is 1.00

Same high speeds with linux live cd.

I have a bunch of seagate 160/250 gig disks, they all perform the same.
The fs under leopard doesn't matter, volume is excluded from spotlight, timemachine is disabled.
Its a fresh install, macbook late 2008.

So whats the deal here?
Any help is apretiated.

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#2 2008-09-09 11:56:39

Chibani
Member
Registered: 2008-09-09
Posts: 6

Re: Very slow write speeds in Leopard (USB)

Hi wink
I've got the same problem with Leopard.
When copying from leopard to DNS313 the average bandwith is 2.5 ~ 3 MB/s ...
I'm connected through a WiFi-G router.
I've tried connecting the DNS directly to the Mac using Ethernet but nothing has changed ...

I've not yet tried with a linux or windows computer because I don't have any ...

The samba shared partition was formated in NTFS, I've changed it to ext2 (because of rights errors ..)
I've updated samba, using funplug
I've also tried using ftp service but it's not faster sad

As anyone any idea to save us, please, someone, please ^^

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