Before 64-bit OS's, vendors were able to create files larger than 2 GB by implementing large file support in software, rather than hardware. If you have files that are larger than 2 GB, then your Solaris server is using software to implement large files, greater than 2 GB. If you did not have this feature enabled, then your 2.4 GB file would not exist. So you should be safe. I worked with files larger than 2 GB on Solaris long before we ever had 64-bit Solaris installed on our servers.
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This was first published in July 2003