Cbs.log Download

No, it should not be that large. The CBS.persist.log should be generated when the CBS gets to be around 50 meg in size. CBS.log should be copied to cbs.persist.log and a new cbs.log file should be started.

As a workaround, on Windows 7, if the "Windows Modules Installer" service is stopped, then starting it appears to trigger the log rotation process that creates a fresh cbs.log file and moves the old file into a compressed CbsPersist .cab archive. My 500mb log file got compressed down to 30mb.

Cbs.log Download

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I have been receiving reports that the plugin script windows_update.vbs generates entries in C:\windows\logs\cbs\cbs.log, causing the file to eventually grow to sizes of several gigabytes, specifically on 2008 servers.

To clear down the CBS.log file, restart the windows modules installer service on the affected box, then run sfc /scannow, which will get rid of any undeletable

cbs.log.persistxxxx files (which could be huge).

I've found that this is caused by large Component-Based Servicing logs. These are stored at C:\Windows\Logs\CBS. The current log file is named "cbs.log". When "cbs.log" reaches a certain size, a cleanup process renames the log to "CbsPersist_YYYYMMDDHHMMSS.log" and then attempts to compress it into a .cab file.

However, when the cbs.log reaches a size of 2 GB before that cleanup process compresses it, the file is too large to be handled by the makecab.exe utility. The log file is renamed to CbsPersist_date_time.log, but when the makecab process attempts to compress it the process fails (but only after consuming some 100 MB under \Windows\Temp). After this, the cleanup process runs repeatedly (approx every 20 minutes in my experience). The process fails every time, and also consumes a new ~ 100 MB in \Windows\Temp before dying. This is repeated until the system runs out of drive space.

One user added an interesting comment. He wrote, that Windows 7 looks during each start at cbs.log and compress a file that's bigger as 32 MByte. But on systems, that are running for long time in 'standby/energy saving' mode, this checks are not done, so the 2 GByte limit is reached. ff782bc1db