This is the most comprehensive description of the Magento 1.3.x, 1.4.x, 1.5.x, 1.6.x and 1.7.x upgrade process.
Additionally It contains step-by-step instructions and troubleshooting information.
Prepare for Magento upgrade (this part of the article is for old 1.3.x, 1.4.x versions only)
Lets imaging that you have old Magento 1.3.x - 1.4.x store and you need to upgrade it to latest Magento 1.7.x version. First of all it is highly recommended to backup your live store files/database and disable Magento compiler cache.
Next you need to get SSH access from your hosting provider and connect to your server via SSH protocol (using Linux command shell or Putty SSH client for Windows).
After connection via SSH, go to your store folder and execute these commands:
1 - Change permissions on lib/pear folder to writable (recursively):
I struggled with an issue that bugged me for a few hours. I noticed that var/cache was empty! That was strange..so I did some research and this happened right after I setup apc and memcached.
It turns out the the instructions i followed was saving them into memcached instead of the file system under var/cache
Here is what my app/etc/local.xml looked like:
<cache>
If this next line was not commented out, it was going to be saved to memcached and NOT the file system
<!-- backend>memcached</backend -->
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