Ubuntu Networking :: Samba Crashing When Reading / Writing Many Small Files?
Mar 18, 2010
Samba seems to crash and come back after some seconds if I copy a lot of small files in a short period of time over the network. How do I fix it?
I have Ubuntu 9.10 Server 64bit running on a D945GCLF2 board sharing two 1TB ext4 formatted HDDs to my Windows PCs using samba. I've been having an issue with reading or writing files through samba. It happens during copying operations or checksumming, anything that reads or writes MANY small files in a small amount of time. I am pretty sure the problem has to do with my server because the server has run on two different LANs in different homes and will crash from activity with any of several other PCs. There is no crashing if I access the files through SSH, although when I do that the max transfer speed is less than 1MB/s.
When I induce the crashing, there is absolutely no output to the server terminal.
As an easy access example of something that will crash samba, extracting Cinebench R11.5 to the server will do the job. It always fails.
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Whenever I am busy reading or writing large files, or large sum of files, my computer is unresponsive. Screens are getting greyed-out and I just can sit there and wait until the reading/writing is done.
This is not caused by the CPU which is overstressed because it is not. Look at the attachments and you will see the CPU is used for about 20%. When these pictures were captured the computer was using hellanzb to unrar a long list of rar-files.
When you look at my signature you see the computer is not bad at all, just disk-access is slow. I can transfer files with a maximum speed of 30MB/s. Is that normal or is it very slow? I don't know the numbers. I have 2 SATA disks.
O.S. is Mint 9-Isadora, based on Ubuntu 10.04 and I use the 64-bits version.
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c read sac file
PROGRAM RSAC
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[Code]....
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Jan 25, 2011
user@user-laptop:~$ sudo dd if=sd_backup of=/dev/sdd bs=4M conv=noerror,sync
205520896 bytes (206 MB) copied, 28.564 s, 7.2 MB/s
247463936 bytes (247 MB) copied, 57.1285 s, 4.3 MB/s
260046848 bytes (260 MB) copied, 73.2388 s, 3.6 MB/s
289406976 bytes (289 MB) copied, 104.121 s, 2.8 MB/s
[Code]....
How come dd gets slower after copying this 8GB file? What can I do about it?
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May 9, 2010
I've used ext2ifs drivers to mount my ext3 partition in winxp, but I don't have write acces, it's mounted in a read-only mode, and i didn't check the rad-only box during the installation of the drivers.I've used help from the official site http://www.fs-driver.org/and this tutorial http://www.dedoimedo.com/computers/l...s-windows.html
It's a straithfoward proces so I dont understand what I did wrong.I'm using fresh xp install with (more or less) all the updates and ubuntu 10.04Also the partition is mounted at /home, so I dont know if that makes any diferance.
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Quote:
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int ret;
[code]...
Quote:
int WERT
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Code:
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[Code].....
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Jul 22, 2010
If this is the right forum i don't know, but I'm having a problem which crashes my home server when writing to Samba. Googling and a quick search in this forum didn't help me any further. Is there anyone with a clue what to do?When I write several hundreds MB to my Samba share from a Windows machine the machine crashes (both with Win XP and Win 7). The problem is reproducible, although the precise moment (about 1 minute) or amount transfered data varies (about 300 to 800 MB). Small writes go well.Reading about 5 GB from Samba to Windows went without a hitch.
Hardware:
- Foxconn r10-s3 (includes Atom N330) with 2 GB RAM
Software:
[code]....
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Code: Summary:
SELinux is preventing the samba daemon from reading users' home directories.
Detailed Description:
SELinux has denied the samba daemon access to users' home directories. Someone
is attempting to access your home directories via your samba daemon. If you only
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Fix Command:
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Additional Information:
Source Context system_u:system_r:smbd_t:s0
Target Context unconfined_u:object_r:user_home_dir_t:s0
Target Objects /home/micah [ dir ]
Source smbd
[code]....
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Quote:
[global]
server string = %h server (Samba, Ubuntu)
security = SHARE
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[Code]....
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[Code]...
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