. ▁They ▁are ▁made ▁spe cially ▁for ▁use ▁in ▁a ▁bla de ▁en closure ▁and ▁cannot ▁be ▁used ▁without ▁such . ▁Bla de ▁systems ▁aim ▁towards ▁maximum ▁density ▁and ▁manage ability ▁at ▁limited ▁ra ck ▁space . ▁ ▁There ▁are ▁two ▁models ▁of ▁bla de ▁en clos ures : ▁H PE ▁Bla de System ▁c 3 0 0 0 ▁En closure ▁( 8 ▁B ays ▁for ▁Bl ades ), ▁and ▁H PE ▁Bla de System ▁c 7 0 0 0 ▁En clos ures ▁( 1 6 ▁B ays ▁for ▁Bl ades ). ▁ ▁One ▁advantage ▁of ▁H P / HP E ▁Bla de ▁En clos ures ▁compared ▁to ▁compet itors ▁( such ▁as ▁IBM ▁Bla de ▁Systems ) ▁has ▁been ▁that ▁the ▁older ▁generation ▁en clos ures ▁have ▁been ▁able ▁to ▁accommod ate ▁new ▁generation ▁B L ▁servers ▁just ▁by ▁upgrad ing ▁the ▁firm ware ▁for ▁O A ▁in ▁the ▁en closure ▁( On board ▁Administr ator ). ▁However ▁improvements ▁to ▁back - plane ▁of ▁the ▁en closure ▁in ▁the ▁new ▁generation ▁en clos ures ▁have ▁enabled ▁faster ▁I / O ▁capabilities ▁( such ▁as ▁ 1 0 G bit / s ▁E ther net ▁ad ap ters ▁and ▁switch es , ▁and ▁In fin ib and ). ▁The ▁physical ▁design ▁of ▁the ▁en clos ures ▁has ▁not ▁changed ▁since ▁the ▁first ▁versions ▁( other ▁than ▁the ▁larger ▁L CD ▁screen ▁at ▁the ▁front ▁compared ▁to ▁the ▁first ▁generation ▁en clos ures , ▁and ▁new ▁pl astic ▁covers ▁and ▁H PE ▁brand ing