innodb don't write ibdata ib_logfile since 5 months

[Virgil Dubois]

Hi,

We have an old server (VM) in debian 5.0 with MySQL 5.0.51a. Last week end this server crashed due to a power failure. When it come back, it lost 5 months of data.

If i check ibdata and ib_logfile in my backups, the file modification date is older than 4 months.

I restore this files but no more data

In addition ibdata file is 130Mb and in the Mysqld config file there is this line
innodb_buffer_pool_size = 256M

Do you think data are not flush on disk ?
Is it a bug ?
is it possible to find data ?

Best regards