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Storage Area Network Job Interview Questions Date: 26/Nov/2012 MD Ali Ashara !han

b) Hardware Zoning.Q."hat are #i$erent levels o %oning&

a) Port Level zoning.b) b) WWN Level zoning.c) c) Device Level zoning.d) d) Protocol Level zoning.e) e) LUN Level zoning.Q.

"hat is virtuali%ation&A technique o hiding the !h"#ical characteri#tic# o co$!uter re#ource# ro$the wa" in whichother #"#te$ a!!lication or end u#er interact with tho#ere#ource#. Aggregation% #!anning orconcatenation o the co$bined $ulti!lere#ource# into larger re#ource !ool#.Q.

"hat is storage virtuali%ation&&torage virtualization i# a$alga$ation o $ulti!le n'w #torage device# into#ingle #torage unit.Q.

"hat is '(N Masking&A) A $ethod u#ed to create an e(clu#ive #torage area and acce## control.And thi# can be achievedb" #torage device control !rogra$.

Q) "hat are two t*+es o re,or#ing te,hni-ues on the ta+es& a) Linear ecording b) Helical &can ecording.

Q) Na.e ew t*+es o a+e storage&a) Digital Linear *a!e b) Advanced +ntelligent *a!e c) Linear *a!e ,!enQ.

"hat is sna+shot&

A #na!#hot o data ob-ect contain# an i$age o data at a !articular !oint oti$e.

Q)"hat is stri+e unit si%e&+t i# data di#tribution #che$e that co$!le$ent # the wa" o!erating #"#te$reque#t data. ranularit" at which data i# #tored on one drive o the arra"be ore #ub#equent data i# #tored on thene(t drive o the arra". &tri!e unit#ize #hould be clo#e to the #ize o the #"#te$ +', reque#t.Q.

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"hat is hot swa++ing&Device# are allowed to be re$oved and in#erted into a #"#te$ withoutturning o/ the #"#te$.Q.

"hat is ot S+aring&

A #!are device i# available to be in#erted into the #ub#"#te$ o!erationwithout having to re$oveand re!lace a device.Q.

"hat is SM&Hierarchical &torage 0anage$ent 1 An a!!lication that atte$!t# to $atchthe !riorit" o datawith the co#t o #torage.Q.

"hat are #i$erent t*+es o ba,ku+ s*ste.&a) ,2ine.b) ,nline.c) Near Line.

Storage Area Network Job Interview Questions Q) "hat is ba# blo,k reallo,ation& A bad #ector i# re$a!!ed or reallocated to good #!are bloc3 and thi#in or$ation i# #tored in theinternal table on the hard di#3 drive. *he badbloc3# are identi4ed during the $edia te#t o the HDDa# well a# duringvariou# t"!e# o read write o!eration# !er or$ed during the +', te#t#. A!art

ro$the new generation o HDD co$e# with a technolog" called 5 0&6bac3ground $edia #can) whichcontinuou#l" #can# the HDD $edia orde ect# and $a!# the$ when the drive i# idle 6thi# i#!er or$ed a ter the

HDD i# attached to the #"#te$).Q ."hat is the #i$erent between .irroring 3outing an#.ulti+athing&

edundanc" 7unction# elation#hi!# oleMirroring

enerate# 8 io# to 8 #torage target# 9reate# 8 co!ie# o data.3outingDeter$ined b" #witche# inde!endent o &9&+ ecreate# n'w route a ter a

ailure.Multi+athing

*wo initiator to one target &elect# the LUN initiator !air to u#e.

Q ."hat are the #i$erent t*+es o ,lusters&a) High availabilit" clu#ter#.b) High Per or$ance 9lu#ter#.c) Load

5alancing 9lu#ter#.

Q) "hat is Multi+ath I/4&

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A. 7ault tolerant technique where% there i# $ore than one !h"#ical !athbetween the 9PU in theco$!uter #"#te$# and it# $ain #torage device#through the bu#e#% controller#% #witche# and otherbridge device# connectingthe$.

Q)"hat is Jitter& :itter re er# to an" deviation in ti$ing that a bit #trea$ #u/er# a# it traver#e#the !h"#ical $ediu$and the circuitr" on1board the end device#. A certaina$ount o deviation ro$ the original #ignalingwill occur naturall" a# #erialbit #trea$ !ro!agate# over 4bre1o!tic or co!!er cabling.0ainl" cau#ed b"electro1$agnetic inter erence.

Q. "hat is 5 3/5it error rate&Probabilit" that a tran#$itted bit will be erroneou#l" received i# the $ea#ureo nu$ber o bit#6erroneou#) at the out!ut o the receiver and dividing b" thetotal nu$ber o bit# in tran#$i##ion.

Q. "hat is b*+ass ,ir,uitr*&A circuit that auto$aticall" re$ove# the #torage device ro$ the data !ath679 device out o 79AL loo!) when #ignaling i# lo#t 6thi# #ignal i# called !ortb"1!a## #ignal).

Q. "hat is ,onne,tion allegian,e&iven $ulti!le connection# are e#tabli#hed% individual co$$and're#!on#e

!air $u#t ;ow overthe #a$e connection. *hi# connection allegiance en#ure#that #!eci4c read or write# co$$and# are ul4lled without an" additionaloverhead o $onitoring $ulti!le connection# and to #ee whether a!articular

reque#t i# co$!leted.

Q. ow is the ,a+a,it* o the DD ,al,ulate#&Nu$ber o Head# < Nu$ber o 9"linder# < &ector# !er trac3 < &ector &ize.Q. "hat is ba# blo,k reallo,ation&A bad #ector i# re$a!!ed or reallocated to good #!are bloc3 and thi#in or$ation i# #tored in theinternal table on the hard di#3 drive. *he badbloc3# are identi4ed during the $edia te#t o the HDDa# well a# duringvariou# t"!e# o read write o!eration# !er or$ed during the +', te#t#. A!art

ro$the new generation o HDD co$e# with a technolog" called 5 0&

6bac3ground $edia #can) whichcontinuou#l" #can# the HDD $edia orde ect# and $a!# the$ when the drive i# idle 6thi# i#

Storage Area Network Job Interview Questions

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