On 17/10/17 01:26, duanyao wrote:
Hi,
Is it safe to resize a rock storage file as follow (while squid is not
running)?
1) Increase a rock storage file by increasing the size specified in the
configuration file;
2) Decrease a rock storage file by decreasing the size specified in the
configuration file and run `truncate --size <new size> rock_file`;
By "safe" I mean no rubbish data will ever be delivered to clients after
resizing, while loss of some cached data is OK.
Hell No.
*none* of Squids caches should be manipulated manually. Especially while
the proxy is running. The UFS based caches are a lot more forgiving of
file deletion, but that is an artifact of their lazy validation.
rock cache is a single file with more similarities to SQL-type databases
or a memmap swap file than Squids other cache areas. The -z process for
rock caches actively formats the file used for data storage into cells
and blocks. Changing its size manually will definitely lead to some form
of corruption.
Adding a tool for properly managing these type of changes to caches has
been on my wishlist for many years now and the design is mostly planned
out. Please discuss on squid-dev if you are interested in picking up
that project.
Amos
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