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Top Forums UNIX for Beginners Questions & Answers CentOS 6 ran out of space, need to reclaim it Post 303038179 by Neo on Tuesday 27th of August 2019 01:15:52 PM
Old 08-27-2019
The main problem with putting all the data on the same root partition when running a production database is that if the database directory gets very large and fills up the root partition, it is possible the system will not boot and / or critical root partition log files will not log.

When running databases like we do with very large binary transactions logs, the database directory gets very large very fast.

However, when on a separate partition and full, not on root, the system will boot and continue to log (syslog, etc).

That is a big plus for most system admins knowing that a full data partition will not crash the boot partition.

For me, it's nothing to do with "traditional unix".. I do it because I do not want a full db partition to effect the boot partition and since I have seen this problem many times, it's better to have the db crash than the entire system / server crash.. I can log into a crash due to a full db partition, but I cannot login to a system which will not boot due to a full root / boot partition.

So, for me, all my data for a big database is off the root / boot partition, always (for production). Same is true for my backup directory of mysql dumps.

(As Peasant says as well in his analysis ...)
 

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safe_mysqld(1)							  MySQL database						    safe_mysqld(1)

NAME
mysqld_safe - start the mysqld daemon on Unix. SYNOPSIS
mysqld_safe [--basedir=path] [--core-file-size=#] [--defaults-extra-file=path] [--defaults-file=path] [--open-files=#] [--datadir=path] [--err-log=path] [--ledir=path] [--log=path] [--no-defaults] [--open-files=#] [--pid-file=path] [--port=#] [--socket=path] [--timezone=#] [--user=#] DESCRIPTION
mysqld_safe adds some safety features such as restarting the server when an error occurs and logging run-time information to a log file. --basedir=path --core-file-size=# Size of the core file mysqld should be able to create. Passed to ulimit -c. --defaults-extra-file=path --defaults-file=path --datadir=path --err-log=path --ledir=path Path to mysqld --log=path --no-defaults --open-files=# Number of files mysqld should be able to open. Passed to ulimit -n. --pid-file=path --port=# --socket=path --timezone=# Set the timezone (the TZ) variable to the value of this parameter. --user=# NOTE
Note that all options on the command line to mysqld_safe are passed to mysqld. If you wants to use any options in mysqld_safe that mysqld doesn't support, you must specify these in the option file. SEE ALSO
isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqldump(1), mysql_fix_privilege_tables(1), mysqlshow(1), mysql_zap(1), perror(1), replace(1) For more information please refer to the MySQL reference manual, which may already be installed locally and which is also available online at http://www.mysql.com/doc/en/ BUGS
Please refer to http://bugs.mysql.com/ to report bugs. AUTHOR
Ver 1.0, distribution 4.0.24 Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com). This software comes with no war- ranty. Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercurme- dia.com) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+------------------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+------------------------------------+ |Availability | SUNWmysqlr, SUNWmysqlu, SUNWmysqlt | +--------------------+------------------------------------+ |Interface Stability | External | +--------------------+------------------------------------+ NOTES
Source for mysql is available on http://opensolaris.org. MySQL 4.0 19 December 2000 safe_mysqld(1)
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