What is the journal?












1















I shut down my computer the hard way and next startup there was message on boot for several seconds saying recovering journal. Four startups later and the message was not there - only the first time. Looks like there are no consequences or side effects. Thanks to this question I know why it happened but nowhere on the internet says what the journal is. There are no problems with it, I'm just interested in what it is.






boot ext4







share|improve this question





























    1















    I shut down my computer the hard way and next startup there was message on boot for several seconds saying recovering journal. Four startups later and the message was not there - only the first time. Looks like there are no consequences or side effects. Thanks to this question I know why it happened but nowhere on the internet says what the journal is. There are no problems with it, I'm just interested in what it is.






    boot ext4







    share|improve this question



























      1












      1








      1








      I shut down my computer the hard way and next startup there was message on boot for several seconds saying recovering journal. Four startups later and the message was not there - only the first time. Looks like there are no consequences or side effects. Thanks to this question I know why it happened but nowhere on the internet says what the journal is. There are no problems with it, I'm just interested in what it is.






      boot ext4







      share|improve this question
















      I shut down my computer the hard way and next startup there was message on boot for several seconds saying recovering journal. Four startups later and the message was not there - only the first time. Looks like there are no consequences or side effects. Thanks to this question I know why it happened but nowhere on the internet says what the journal is. There are no problems with it, I'm just interested in what it is.






      boot ext4




      boot ext4






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 26 mins ago









      wjandrea

      8,49642259




      8,49642259










      asked 1 hour ago









      GarromGarrom

      3081217




      3081217






















          1 Answer
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          active

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          3















          Does someone knows what journal is?




          Part of a modern day filesystem is a feature called "journaling". We use "ext4" as a filesystem. (ext3, ext2 are older versions. NTFS is a Microsoft equivalent.)




          A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the intentions of such changes in a data structure known as a "journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online more quickly with a lower likelihood of becoming corrupted




          Source: Wikipedia - Journaling file system, cites: IBM - Anatomy of Linux journaling file systems



          Basically the message means the system did an integrity check on this part of your filesystem. It is forced by the system, so generally there is nothing to worry about. When you have power cutoffs, the journal can get damaged and, unless your harddisk is really busted, tends to get repaired during this check.






          share|improve this answer


























          • Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

            – Ralf
            44 mins ago











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          3















          Does someone knows what journal is?




          Part of a modern day filesystem is a feature called "journaling". We use "ext4" as a filesystem. (ext3, ext2 are older versions. NTFS is a Microsoft equivalent.)




          A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the intentions of such changes in a data structure known as a "journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online more quickly with a lower likelihood of becoming corrupted




          Source: Wikipedia - Journaling file system, cites: IBM - Anatomy of Linux journaling file systems



          Basically the message means the system did an integrity check on this part of your filesystem. It is forced by the system, so generally there is nothing to worry about. When you have power cutoffs, the journal can get damaged and, unless your harddisk is really busted, tends to get repaired during this check.






          share|improve this answer


























          • Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

            – Ralf
            44 mins ago
















          3















          Does someone knows what journal is?




          Part of a modern day filesystem is a feature called "journaling". We use "ext4" as a filesystem. (ext3, ext2 are older versions. NTFS is a Microsoft equivalent.)




          A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the intentions of such changes in a data structure known as a "journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online more quickly with a lower likelihood of becoming corrupted




          Source: Wikipedia - Journaling file system, cites: IBM - Anatomy of Linux journaling file systems



          Basically the message means the system did an integrity check on this part of your filesystem. It is forced by the system, so generally there is nothing to worry about. When you have power cutoffs, the journal can get damaged and, unless your harddisk is really busted, tends to get repaired during this check.






          share|improve this answer


























          • Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

            – Ralf
            44 mins ago














          3












          3








          3








          Does someone knows what journal is?




          Part of a modern day filesystem is a feature called "journaling". We use "ext4" as a filesystem. (ext3, ext2 are older versions. NTFS is a Microsoft equivalent.)




          A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the intentions of such changes in a data structure known as a "journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online more quickly with a lower likelihood of becoming corrupted




          Source: Wikipedia - Journaling file system, cites: IBM - Anatomy of Linux journaling file systems



          Basically the message means the system did an integrity check on this part of your filesystem. It is forced by the system, so generally there is nothing to worry about. When you have power cutoffs, the journal can get damaged and, unless your harddisk is really busted, tends to get repaired during this check.






          share|improve this answer
















          Does someone knows what journal is?




          Part of a modern day filesystem is a feature called "journaling". We use "ext4" as a filesystem. (ext3, ext2 are older versions. NTFS is a Microsoft equivalent.)




          A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the intentions of such changes in a data structure known as a "journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online more quickly with a lower likelihood of becoming corrupted




          Source: Wikipedia - Journaling file system, cites: IBM - Anatomy of Linux journaling file systems



          Basically the message means the system did an integrity check on this part of your filesystem. It is forced by the system, so generally there is nothing to worry about. When you have power cutoffs, the journal can get damaged and, unless your harddisk is really busted, tends to get repaired during this check.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 20 mins ago









          wjandrea

          8,49642259




          8,49642259










          answered 53 mins ago









          RinzwindRinzwind

          204k28389524




          204k28389524













          • Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

            – Ralf
            44 mins ago



















          • Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

            – Ralf
            44 mins ago

















          Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

          – Ralf
          44 mins ago





          Is it correct to say, that journaling is used to protect the filesystems integrity, but not necessarily the integrity of the files (their content)?

          – Ralf
          44 mins ago


















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