many reason will cause 503 error -- for example,no enough memory assigned to php process.
just mention one here:
check php.ini, list all start wirh
extension= ...
zend_entension=...
and comment all of them, and see of 503 error gone.
I think the next step is building matching php for litespeed.
please refer
http://www.litespeedtech.com/support/wiki/doku.php?id=litespeed_wiki:php:lsapi
for detail.
please check with
http://www.litespeedtech.com/support/wiki/doku.php?id=litespeed_wiki:apache:da
"How to replace Apache with LiteSpeed when used with DirectAdmin"
phpmotion:
as its self-description: "PHP motion is a free to download and free to use video sharing software. A PHP video script to make your own Youtube (tm) like website..."
problem:
refer http://www.litespeedtech.com/support/forum/showthread.php?p=20346#post20346
I helped to make...
have you installed any new wordpress plugin which need special php decoder/loader?
A recent experience of mine:
some important files need phpshield loader, but not put in right place for php 5.2.x on 64-bit OS (might be ok for 5.1.x)
generally, if you've installed new plugins in recent...
one of major causes is he can't change folder's owner:group(using chown) in his VPS even as root. so /usr/local/lsws/conf and /usr/local/lsws/admin/conf have wrong owner:group and lsws failed to change them.
yes, it's better than 32M x 500 = ... but these 500 vhost may not run at the same time. check pstree or ps, how many lsphp process running in suExec mode. 1 lsphp process consume individual 1M for opcode cache.
1.check /dev/shm/eA's permission. set it to 777
2.set eaccelerator.shm_only=0