0 1 0 ▁ ▁See ▁also ▁ ▁Jack ▁Lyn ch ▁T unnel , ▁C ork , ▁Ireland ▁John ▁Lyn ch ▁( disambiguation ) <0x0A> </s> ▁IBM ▁Web S phere ▁e X tre me ▁Sc ale ▁is ▁an ▁IBM ▁in - memory ▁data ▁grid ▁product . ▁It ▁can ▁be ▁described ▁as ▁a ▁fully ▁el astic ▁memory ▁based ▁storage ▁grid . ▁It ▁virtual izes ▁the ▁free ▁memory ▁of ▁a ▁potentially ▁large ▁number ▁of ▁Java ▁virtual ▁machines ▁and ▁makes ▁them ▁behave ▁like ▁a ▁single ▁key ▁address able ▁storage ▁pool ▁for ▁application ▁state . ▁App lications ▁can ▁view ▁this ▁as ▁a ▁network ▁attached ▁storage ▁medium . ▁It ▁is ▁key ▁address able ▁and ▁applications ▁can ▁store ▁a ▁value ▁at ▁a ▁key . ▁Data ▁within ▁the ▁grid ▁can ▁be ▁rep licated ▁to ▁achieve ▁fault ▁toler ance ▁and ▁protect ▁against ▁data ▁loss . ▁It ▁can ▁also ▁be ▁written ▁to ▁rel ational ▁databases ▁and ▁any ▁other ▁pers istence ▁backend ▁using ▁write ▁through ▁or ▁write ▁behind ▁techn ologies . ▁Data ▁can ▁be ▁automatically ▁pulled ▁from ▁a ▁backend ▁such ▁as ▁a ▁rel ational ▁database ▁or ▁enter prise ▁application ▁if ▁it ▁isn ' t ▁present ▁in ▁the ▁grid . ▁ ▁IBM ▁Web S phere ▁e X tre me ▁Sc ale ▁can ▁be ▁used ▁to ▁access ▁data ▁from ▁the ▁grid ▁significantly ▁faster ▁than ▁from ▁a ▁traditional ▁database . ▁App lications ▁which ▁have ▁a ▁partition ed ▁data ▁model ▁or ▁data ▁models ▁that ▁follow ▁the ▁const rained ▁tree ▁scheme ▁approach ▁will ▁see ▁linear ▁scaling ▁with ▁products ▁like ▁this . ▁IBM ▁testing ▁has ▁shown ▁that ▁can ▁be ▁scale