Mention which fsync methods are unavailable.
Mention which fsync methods are unavailable.

jmcatamney/gpdb,xuegang/gpdb,yazun/postgres-xl,lisakowen/gpdb,zeroae/postgres-xl,postmind-net/postgres-xl,tangp3/gpdb,royc1/gpdb,kmjungersen/PostgresXL,rubikloud/gpdb,CraigHarris/gpdb,lintzc/gpdb,rvs/gpdb,zeroae/postgres-xl,ahachete/gpdb,oberstet/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,royc1/gpdb,yuanzhao/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,rvs/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,lisakowen/gpdb,rubikloud/gpdb,atris/gpdb,adam8157/gpdb,Chibin/gpdb,jmcatamney/gpdb,50wu/gpdb,cjcjameson/gpdb,ahachete/gpdb,janebeckman/gpdb,ahachete/gpdb,foyzur/gpdb,edespino/gpdb,tangp3/gpdb,rvs/gpdb,tangp3/gpdb,randomtask1155/gpdb,xuegang/gpdb,Chibin/gpdb,postmind-net/postgres-xl,Quikling/gpdb,techdragon/Postgres-XL,Chibin/gpdb,ahachete/gpdb,foyzur/gpdb,lintzc/gpdb,rubikloud/gpdb,ahachete/gpdb,tangp3/gpdb,cjcjameson/gpdb,edespino/gpdb,CraigHarris/gpdb,ovr/postgres-xl,arcivanov/postgres-xl,lisakowen/gpdb,zeroae/postgres-xl,jmcatamney/gpdb,janebeckman/gpdb,tpostgres-projects/tPostgres,xinzweb/gpdb,cjcjameson/gpdb,adam8157/gpdb,lpetrov-pivotal/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,kaknikhil/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,yazun/postgres-xl,kmjungersen/PostgresXL,jmcatamney/gpdb,randomtask1155/gpdb,pavanvd/postgres-xl,lintzc/gpdb,oberstet/postgres-xl,adam8157/gpdb,xuegang/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,arcivanov/postgres-xl,arcivanov/postgres-xl,adam8157/gpdb,royc1/gpdb,pavanvd/postgres-xl,randomtask1155/gpdb,Quikling/gpdb,lisakowen/gpdb,janebeckman/gpdb,rubikloud/gpdb,tpostgres-projects/tPostgres,50wu/gpdb,xinzweb/gpdb,foyzur/gpdb,ahachete/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,janebeckman/gpdb,Quikling/gpdb,chrishajas/gpdb,adam8157/gpdb,rvs/gpdb,oberstet/postgres-xl,atris/gpdb,janebeckman/gpdb,Chibin/gpdb,Chibin/gpdb,rvs/gpdb,Chibin/gpdb,chrishajas/gpdb,xinzweb/gpdb,Quikling/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,Quikling/gpdb,zaksoup/gpdb,Chibin/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,CraigHarris/gpdb,zaksoup/gpdb,rubikloud/gpdb,0x0FFF/gpdb,tangp3/gpdb,50wu/gpdb,CraigHarris/gpdb,edespino/gpdb,royc1/gpdb,cjcjameson/gpdb,rubikloud/gpdb,janebeckman/gpdb,chrishajas/gpdb,rvs/gpdb,lpetrov-pivotal/gpdb,randomtask1155/gpdb,cjcjameson/gpdb,techdragon/Postgres-XL,kaknikhil/gpdb,tangp3/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,tpostgres-projects/tPostgres,tangp3/gpdb,xinzweb/gpdb,Quikling/gpdb,techdragon/Postgres-XL,Quikling/gpdb,randomtask1155/gpdb,kaknikhil/gpdb,yazun/postgres-xl,cjcjameson/gpdb,foyzur/gpdb,0x0FFF/gpdb,xuegang/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,chrishajas/gpdb,yazun/postgres-xl,yuanzhao/gpdb,techdragon/Postgres-XL,jmcatamney/gpdb,ovr/postgres-xl,tangp3/gpdb,lintzc/gpdb,yuanzhao/gpdb,techdragon/Postgres-XL,Quikling/gpdb,royc1/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,atris/gpdb,50wu/gpdb,xuegang/gpdb,atris/gpdb,xuegang/gpdb,rvs/gpdb,chrishajas/gpdb,janebeckman/gpdb,yuanzhao/gpdb,randomtask1155/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,yuanzhao/gpdb,xinzweb/gpdb,chrishajas/gpdb,lintzc/gpdb,snaga/postgres-xl,atris/gpdb,adam8157/gpdb,atris/gpdb,CraigHarris/gpdb,lpetrov-pivotal/gpdb,zeroae/postgres-xl,ovr/postgres-xl,edespino/gpdb,snaga/postgres-xl,zaksoup/gpdb,rvs/gpdb,0x0FFF/gpdb,0x0FFF/gpdb,atris/gpdb,ahachete/gpdb,50wu/gpdb,lpetrov-pivotal/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,CraigHarris/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,janebeckman/gpdb,ashwinstar/gpdb,edespino/gpdb,0x0FFF/gpdb,lisakowen/gpdb,Postgres-XL/Postgres-XL,xuegang/gpdb,oberstet/postgres-xl,lisakowen/gpdb,greenplum-db/gpdb,lisakowen/gpdb,CraigHarris/gpdb,xinzweb/gpdb,lintzc/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,postmind-net/postgres-xl,edespino/gpdb,janebeckman/gpdb,CraigHarris/gpdb,edespino/gpdb,edespino/gpdb,jmcatamney/gpdb,chrishajas/gpdb,atris/gpdb,snaga/postgres-xl,50wu/gpdb,cjcjameson/gpdb,edespino/gpdb,royc1/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,arcivanov/postgres-xl,0x0FFF/gpdb,zaksoup/gpdb,royc1/gpdb,royc1/gpdb,Chibin/gpdb,ahachete/gpdb,jmcatamney/gpdb,foyzur/gpdb,cjcjameson/gpdb,zaksoup/gpdb,Postgres-XL/Postgres-XL,foyzur/gpdb,Chibin/gpdb,greenplum-db/gpdb,50wu/gpdb,rubikloud/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,xuegang/gpdb,greenplum-db/gpdb,oberstet/postgres-xl,lpetrov-pivotal/gpdb,greenplum-db/gpdb,lintzc/gpdb,xinzweb/gpdb,randomtask1155/gpdb,Chibin/gpdb,snaga/postgres-xl,chrishajas/gpdb,foyzur/gpdb,zaksoup/gpdb,tpostgres-projects/tPostgres,ovr/postgres-xl,zaksoup/gpdb,zaksoup/gpdb,adam8157/gpdb,snaga/postgres-xl,kaknikhil/gpdb,kaknikhil/gpdb,rvs/gpdb,kaknikhil/gpdb,lintzc/gpdb,rvs/gpdb,greenplum-db/gpdb,postmind-net/postgres-xl,arcivanov/postgres-xl,yuanzhao/gpdb,xuegang/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,foyzur/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,Quikling/gpdb,lintzc/gpdb,xinzweb/gpdb,zeroae/postgres-xl,tpostgres-projects/tPostgres,kaknikhil/gpdb,ashwinstar/gpdb,50wu/gpdb,ashwinstar/gpdb