What is a good disk i/o speed? (also other major optimizing stuffs)

My server has been running slowly on some somewhat disk intensive operations (like multiple people exploring), and sometimes causes lag.
I checked resources through top, and neither cpu or ram go above 50% usage, so i can only really find the HDD to blame.

I ran this magical dd comand:

Code:

dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

and it gave me this:

Code:

1073741824 bytes (1.1 GB) copied, 9.10504 s, 118 MB/s

(this was with the server running, i got 130 MB/s once)

i've been debating upgrading to a RAMdisk, as i don't really use all my ram.
I've set the bukkit max log lines to 200, and i have no really flatfile intensive plugins (maybe factions?)

My VPS specs:
CPU specs:

Code:

processor      : 0
vendor_id      : GenuineIntel
cpu family      : 6
model          : 45
model name      : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
stepping        : 7
microcode      : 0x70a
cpu MHz        : 2000.062
cache size      : 15360 KB
physical id    : 0
siblings        : 6
core id        : 1
cpu cores      : 1
apicid          : 2
initial apicid  : 2
fpu            : yes
fpu_exception  : yes
cpuid level    : 13
wp              : yes
flags          : fpu de tsc msr pae cx8 sep cmov pat clflush mmx fxsr sse sse2
ss ht syscall nx lm constant_tsc rep_good nopl pni pclmulqdq ssse3 cx16 sse4_1 s
se4_2 x2apic popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm ida arat
epb xsaveopt pln pts dtherm

2GB dedicated ram (dedicating 1.8 to my server)
50GB HDD (not sure if SSD, don't remember, couldn't find. i left speed anywways)
1GB/ps uplink, shared
Debian 7, x86_64

I use spigot, latest 1.6.4 stable.
My spigot.yml

My plugins:
SpecialHeads, Banchantment (custom plugin, blocks certain enchantments, executes on enchanting), InfoBook, NoCheatPlus, WorldEdit, SimpleCommandScheduler, PluginManager, Buycraft, AntiXRay, mcore, Vault, ClearLag, PermissionsEx, KillerMoney, Votifier, ConsoleSay, WorldGuard, Essentials, Factions, VoteSQL, ChatEx, EssentialsSpawn, ChestShop, AutoRank

I launch my server with this:

Code:

#!/bin/bash
ionice -c2 -n0 nice -n +15 /usr/lib/jvm/java-1.7.0-openjdk-amd64/bin/java -Djava.library.path=/usr/lib/jvm/java-1.7.0-openjdk-amd64/lib/amd64 -Xms1800M -Xmx1800M -d64 -server -XX:+UseG1GC -DJINTEGRA_NATIVE_MODE -DJINTEGRA_COINIT_VALUE=0 -Dsun.io.useCanonCaches=false -Djline.terminal=jline.UnsupportedTerminal -XX:ThreadPriorityPolicy=42 -XX:CompileThreshold=1500 -XX:+TieredCompilation -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -XX:+UnlockExperimentalVMOptions -XX:+UseAdaptiveGCBoundary -XX:MaxPermSize=256M -XX:+UseGCOverheadLimit -XX:+UseBiasedLocking -Xnoclassgc -Xverify:none -XX:UseSSE=3 -XX:+UseThreadPriorities -Djava.net.preferIPv4Stack=true -XX:+UseStringCache -XX:+OptimizeStringConcat -XX:+UseFastAccessorMethods -Xrs -XX:+UseCompressedOops -XX:+AggressiveOpts -jar spigot.jar nogui --log-limit 200

The server runs really well except for some (assumed) HDD speed issues.
I am aware that using launch lines like this is often bad, but i removed all the flags that threw errors, and this is improving my server extremely. If you can see any of these flags are bad for my server, mentioning it would be nice
Also, this launch line has caused no problems like hanging or crashing, so i assume it is ok.

As i said, i have Debian 7, openjdk-7-jre (latest in debian repo), and i use screen for keeping the server alive and no graphical desktop.

Any help is greatly appreciated!

 

frash23 Spigot is not supported here. please go/use the correct forums.

 

tcvs
I don't think that he's really looking for spigot support. He just wants to know what he can do to improve his server performance.

 

Locked. Spigot is not supported here.