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Asked: 2026-05-29T05:34:25+00:00

I need to spread mysql data across two disks as follows: innodb_data_file_path = /var/lib/mysql/ibdata:1000G;/disk2/mysql/ibdata2:1000M:autoextend

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I need to spread mysql data across two disks as follows:

innodb_data_file_path =  /var/lib/mysql/ibdata:1000G;/disk2/mysql/ibdata2:1000M:autoextend

mysql attempts to create a new file of 1000G when starting, however it fails silently after writing about 250GB of empty data to ibdata.

Question:

  1. is this due to single file size limit? the OS is centos 6 (ext3 fs) if not what could be the cause of the starting failure. There is enough disk space on the main disk. no extra error log is provided.

  2. is there any other quick and dirty way to spread the data across two disks?

Edit: added df info:

df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             1.8T  308G  1.4T  18% /
tmpfs                 7.9G     0  7.9G   0% /dev/shm
/dev/sda1             471M   92M  355M  21% /boot
/dev/sdb1             1.8T  332G  1.4T  20% /disk2

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1 Answer

  1. Editorial Team

    Yes, I think your problem is with the ext3 filesystem. With a 2k blocksize the maximum file size is 256gb. It looks very likely that you are hitting that limit, which is why innodb fails when it tries to increase the filesize.

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