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for 503 error, it usually means php crash.
please check lsphp5 setting in
Server->External App->lsphp5->
Memory Soft Limit (bytes)
Memory Hard Limit (bytes)
since 1G xcache will be calculated as part of lsphp5 process, so this soft/hard limit should > 1G. if memory assigned to lsphp5 exceed these limit(especially hard limit?), lsphp5 process may be killed by OS(or litespeed process?), so 503 error.
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