Upgraded Linode VPS from 2GB to 4GB plan

Just upgraded this forum's Linode SSD VPS from 2GB to 4GB plan as free disk space was approaching 33GB and thought it would be better to have a bit more breathing room to start with while the forum user activity is still low and the impact of downtime would be minimal

Downtime was minimal Uptime | Centmin Mod Community

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So the current forum server setup is as follows:

Server Information

• 4 Core Intel Xeon E5-2680v2 2.80Ghz Linode SSD VPS
• 4GB Memory
• 96GB SSD Disk space (70GB allocated, rest for snapshot backup restore space)
• Region: Freemont, California

Web stack

• Centmin Mod .07 released LEMP web stack
• Nginx 1.7.1 1.7.4 with ngx_pagespeed 1.8.31.3 1.8.31.4 beta enabled
• PHP 5.5.13 5.6.0 PHP-FPM with Zend OpCache 7.0.4-dev
• MariaDB MySQL 5.5.37 5.5.39 with InnoDB default
• Memcached 1.4.20 server with Memcache 3.0.8/Memcached 2.2.0 + Libmemcached 1.18 (igbinary supported)
• CSF Firewall
• Added: Elasticsearch 1.2.0 1.3.2

Code:

free -m
             total       used       free     shared    buffers     cached
Mem:          4000        755       3244          0         15        252
-/+ buffers/cache:        488       3512
Swap:          511          0        511

Code:

df -hT
Filesystem     Type   Size  Used Avail Use% Mounted on
/dev/xvda      ext4    70G  4.9G   64G   8% /
tmpfs          tmpfs  2.0G     0  2.0G   0% /dev/shm
tmpfs          tmpfs  2.0G   32K  2.0G   1% /tmp

Code:

cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 62
model name      : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping        : 4
microcode       : 0x416
cpu MHz         : 2800.098
cache size      : 25600 KB
physical id     : 1
siblings        : 4
core id         : 2
cpu cores       : 1
apicid          : 36
initial apicid  : 36
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu de tsc msr pae cx8 apic sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl nonstop_tsc pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes f16c rdrand hypervisor lahf_lm ida arat epb pln pts dtherm fsgsbase erms
bogomips        : 5602.53
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 62
model name      : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping        : 4
microcode       : 0x416
cpu MHz         : 2800.098
cache size      : 25600 KB
physical id     : 1
siblings        : 4
core id         : 2
cpu cores       : 1
apicid          : 36
initial apicid  : 36
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu de tsc msr pae cx8 apic sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl nonstop_tsc pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes f16c rdrand hypervisor lahf_lm ida arat epb pln pts dtherm fsgsbase erms
bogomips        : 5602.53
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 6
model           : 62
model name      : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping        : 4
microcode       : 0x416
cpu MHz         : 2800.098
cache size      : 25600 KB
physical id     : 1
siblings        : 4
core id         : 2
cpu cores       : 1
apicid          : 36
initial apicid  : 36
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu de tsc msr pae cx8 apic sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl nonstop_tsc pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes f16c rdrand hypervisor lahf_lm ida arat epb pln pts dtherm fsgsbase erms
bogomips        : 5602.53
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 62
model name      : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping        : 4
microcode       : 0x416
cpu MHz         : 2800.098
cache size      : 25600 KB
physical id     : 1
siblings        : 4
core id         : 2
cpu cores       : 1
apicid          : 36
initial apicid  : 36
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu de tsc msr pae cx8 apic sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl nonstop_tsc pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes f16c rdrand hypervisor lahf_lm ida arat epb pln pts dtherm fsgsbase erms
bogomips        : 5602.53
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management: