Very slow read/write speed from usb HD

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Mangus
DD-WRT Novice


Joined: 13 Feb 2013
Posts: 7
PostPosted: Fri Feb 20, 2015 20:51    Post subject: Very slow read/write speed from usb HD Reply with quote
I have a buffalo WBMR-HP-G300H with latest dd-wrt SVN revision 26138.

I've attached a 2Tb usb HD and everything (torrent, samba, etc.) work fine except read/write speed.

with cable or wifi, if I try to read or write on the disk, I can achive 2,5Mb/sec top.

But hdparm seems to be ok:

Quote:
hdparm -tT /dev/sda1

/dev/sda1:
Timing buffer-cache reads: 26 MB in 0.54 seconds = 48850 kB/s
Timing buffered disk reads: 44 MB in 3.09 seconds = 14559 kB/s


What could be the cause? I barely can watch HD movies through the network with my media center with this speed...
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Mangus
DD-WRT Novice


Joined: 13 Feb 2013
Posts: 7
PostPosted: Fri Feb 20, 2015 21:12    Post subject: Reply with quote
2nd time hdparm...even better:

/dev/sda1:
Timing buffer-cache reads: 38 MB in 0.51 seconds = 75976 kB/s
Timing buffered disk reads: 51 MB in 3.11 seconds = 16763 kB/s


But the samba read/write speed remains very slow...
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ph03n!x
DD-WRT User


Joined: 28 Jan 2015
Posts: 50
PostPosted: Sun Feb 22, 2015 20:30    Post subject: Reply with quote
What is the filesystem in the HDD? I have been able to get between 10 and 12 Mbps consistently on ext4, mounting with noatime and nodiratime options using a startup script, which also runs a fsck at every mount (forcing a full check if it is not clean or has not be checked fully for a while - default options).

Try a different HDD or USB too, just in case.
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ArturDent
DD-WRT Novice


Joined: 30 Jan 2015
Posts: 11
PostPosted: Mon Feb 23, 2015 18:18    Post subject: Re: Very slow read/write speed from usb HD Reply with quote
Mangus wrote:
I can achive 2,5Mb/sec top.

ph03n!x wrote:
I have been able to get between 10 and 12 Mbps consistently on ext4

Just note:
I have 2 TB USB 2.0 with these partitions
ext3 - 10~13 Mbps
NTFS - 2~3.5 Mbps
So..., first check the file system
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