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an application accesses a disk directory containing about 3 million files (including directories). I would like to apply the noatime option for that filesystem and I would like to know whether I can do that while applications are running and accessing that filesystem.

the command I'd apply would look like this:

mount -o remount,noatime /

Any experience with that? I run one single application using the file system, and it is a 100% Java application (1 JVM running).

Ubuntu Version: 9.10 (Karmic)


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You can use the command you proposed while the system is running, for security reasons I would do it during the night or when the application is not in use. The command mount return, among other lines, somthing like this

/dev/sda5 on / type ext4 (rw,errors=remount-ro,data=writeback)

then if you issue the command you proposed

mount -o remount,noatime /

the output of the command mount looks like this

/dev/sda5 on / type ext4 (rw,noatime,errors=remount-ro,data=writeback)

showing that the option was added correctly. Hope I helped you!

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