▁then ▁updates ▁would ▁flow ▁in ▁a ▁tree ▁like ▁structure ▁through ▁specific ▁paths . ▁In ▁a ▁flat ▁topology ▁it ▁is ▁entirely ▁a ▁matter ▁of ▁the ▁peer ▁relationships ▁between ▁nodes ▁as ▁to ▁how ▁updates ▁take ▁place . ▁In ▁a ▁hy brid ▁topology ▁consisting ▁of ▁both ▁flat ▁and ▁hierarchy ▁top ologies ▁updates ▁may ▁take ▁place ▁through ▁specific ▁paths ▁and ▁between ▁pe ers . ▁ ▁Rep lication ▁pla cement ▁strategy ▁There ▁are ▁a ▁number ▁of ▁ways ▁the ▁rep lication ▁management ▁system ▁can ▁handle ▁the ▁creation ▁and ▁pla cement ▁of ▁rep lic as ▁to ▁best ▁serve ▁the ▁user ▁community . ▁If ▁the ▁storage ▁architecture ▁supports ▁rep lica ▁pla cement ▁with ▁sufficient ▁site ▁storage , ▁then ▁it ▁becomes ▁a ▁matter ▁of ▁the ▁needs ▁of ▁the ▁users ▁who ▁access ▁the ▁datasets ▁and ▁a ▁strategy ▁for ▁pla cement ▁of ▁rep lic as . ▁There ▁have ▁been ▁numerous ▁strateg ies ▁proposed ▁and ▁tested ▁on ▁how ▁to ▁best ▁manage ▁rep lica ▁pla cement ▁of ▁datasets ▁within ▁the ▁data ▁grid ▁to ▁meet ▁user ▁requirements . ▁There ▁is ▁not ▁one ▁universal ▁strategy ▁that ▁fits ▁every ▁requirement ▁the ▁best . ▁It ▁is ▁a ▁matter ▁of ▁the ▁type ▁of ▁data ▁grid ▁and ▁user ▁community ▁requirements ▁for ▁access ▁that ▁will ▁determine ▁the ▁best ▁strategy ▁to ▁use . ▁Rep lic as ▁can ▁even ▁be ▁created ▁where ▁the ▁files ▁are ▁encrypted ▁for ▁confident ial ity ▁that ▁would ▁be ▁useful ▁in ▁a ▁research ▁project ▁dealing ▁with ▁medical ▁files . ▁The ▁following ▁section ▁contains ▁several ▁strateg ies ▁for ▁rep lica ▁pla cement . ▁ ▁Dynamic ▁rep lication ▁Dynamic ▁rep lication ▁is ▁an