Out of Space error when using CIFS to mount file system from NAS or other device

Owned by Carlos Osorio
Nov 12, 2020
1 min read


SUMMARY

Aug 21, 2015

Some customers have reported that they get an error usually an out of space error when trying to copy files to a third party NAS or other CIFS file system when using Snare Server v6 even though there are no physical space issues. A symptom is a file could become corrupted and maybe slightly smaller than the original and may not open correctly or seems to be missing data if it was a tar ball or zip file.

The issue appears to be a change in the buffer size for the mount.cifs system call in Ubuntu and it is attempting to use a 57k buffer size and not all devices can handle this.  To address the use a smaller value such as setting wsize=32768 in the mount option. ie

mount -t cifs //host/sharename /mnt/mountpoint -o credentials=/root/mylogindetails,wsize=32768

Ensure that you unmount and remount the file system after you make the change and if you want to make the change permanent then update the /etc/fstab file.