one of my exchange server D drive got filled , it suddenly showed o bytes out of 90gb,

we ran tree size software to check what caused it to fill it up. we could not see except pagefile.sys.

we tried to remove some.pst files from D drive to C drive got some space but it got filled right away.

we also tried to involve storage team to increase the disk space by 10 gb got filled righta way.

we could see on D drive there were only 3gb files , we checked hidden files and extension, nothing found

finally we saw one backup process was running which was filling THE DRIVE, and no files found still, so what was going n background?

we do back from vision third party

my question is how a backup process could fill the drive? when there were no transaction logs on that drive
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Tree size software is good to visualize what's going on. But most of the time, you have to start it explicitly with the "Run as Administrator" option.

Aslo, some backup solutions, usually image based, will reserve the big file while backupping, but not display it until it's totally done. The space is reserved, but you don't see the file (unless you would reboot, which either frees the space, and no file found, or file is now found, and probably over a few GB).
Obviously, you have full control over the server, so you should know what backup is running. Trace it, and maybe stop the job, or adjust it to have it comply with the space reservation requirement.

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pramod1Author Commented:
we did reboot the server but of no use so I believe this goes " some backup solutions, usually image based, will reserve the big file while backupping, but not display it until it's totally done"
pramod1Author Commented:
on one exchange DAG server we encountered "Failure Reason for back up failed on one of databases : The job is pending because: The destination encountered an error while processing the data from the source.  
 Number of restarts has exceeded the maximum number allowed [10].  

any thing you can conclude regarding failure
The DAG server is probably the backup server which holds the jobs etc. It was using the Exchange with disk space problems as a remote storage. Since you rebooted that server, the job didn't finish and that's why you got the warning the backup failed. So on that backup server, just go through the job parameters about where it stores data and maybe move it to somewhere where you know it will have enough space left for ALL Exchange DB's combined.
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