Patent ID: 6253295
Filing Date: 2001-06-26
Classification: G06F,Y10S

Abstract:
A data storage system including first storage means, second storage means, third storage means and fourth storage means, said first and second storage means arranged to enable a mirroring of data therebetween using remote copy procedures so as to maintain a synchronism of data therebetween, said storage system further comprising:first processor means responsive to a copy pair command, or an equivalent command, from a host processor, for (i) copying a directory from said first storage means to a directory for said third storage means and for (ii) dispatching a copy command, or an equivalent command from said remote copy procedures, to copy a directory for said second storage means to a directory for said fourth storage means; andsecond processor means coupled to said second storage means and said fourth storage means and responsive to said dispatched copy command or said equivalent command from said first processor means, to cause copying of said directory of said second storage means to said directory of said fourth storage means using said remote copy procedures, whereby said third and fourth storage means are each controlled to include directories which duplicate said directories of said first and second storage means.