User Manual

Table Of Contents
Vess R2000 Series Product Manual Promise Technologies
Technology Background 549
disk arrays 549
MediA PAtrOl 549
PdM 550
logiCal driVes 551
RAID 1 – MIRRoR 554
RAID 1eenhAnceD MIRRoR 556
RAID 5 – Block AnD PARIty StRIPe 558
RAID 6 – Block AnD DouBle PARIty StRIPe 559
RAID 10 – MIRRoR + StRIPe 561
rAid 50 – striPing Of distributed PArity 563
rAid 60 – striPing Of dOuble PArity 566
raid leVel MigratioN 569
MigrAtiOn reQuireMents 569
sOurce And tArget rAid levels 569
stripe size 578
sectOr size 578
Preferred cOntrOller id 578
initiAlizAtiOn 579
PArtitiOn And fOrMAt 579
spare driVes 580
DefInItIon 580
oPtIonS 580
reQuireMents 581
trAnsitiOn 581
running A trAnsitiOn 581
raid CoNtrollers 587
lun Affinity 587
AluA 587
cAche POlicy 588
reAd cAche POlicy 588
write cAche POlicy 589
AdAPtive writebAck cAche 590
POwer sAving 591
cAPAcity cOerciOn 591
isCsi MaNageMeNt 593
bAsic iscsi 593