This one was easy.
[root@cdfs tw_cli]# ./tw_cli //cdfs> info c0 Unit UnitType Status %Cmpl Stripe Size(GB) Cache AVerify IgnECC ------------------------------------------------------------------------------ u0 RAID-5 OK - 64K 1396.95 ON OFF OFF u1 RAID-5 OK - 64K 1396.95 ON OFF ON Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 465.76 GB 976773168 WD-WMASY6064174 p1 OK u0 465.76 GB 976773168 WD-WCANU1090078 p2 OK u0 465.76 GB 976773168 WD-WCANU1119743 p3 OK u0 465.76 GB 976773168 WD-WCANU1089924 p4 OK u1 465.76 GB 976773168 WD-WMASY8103731 p5 SMART-FAILURE u1 465.76 GB 976773168 WD-WCANU1109927 p6 OK u1 465.76 GB 976773168 WD-WCAPW5103756 p7 OK u1 465.76 GB 976773168 WD-WCANU1125288 //cdfs> maint remove c0 p5 Exporting port /c0/p5 ... Done. //cdfs> info c0 Unit UnitType Status %Cmpl Stripe Size(GB) Cache AVerify IgnECC ------------------------------------------------------------------------------ u0 RAID-5 OK - 64K 1396.95 ON OFF OFF u1 RAID-5 DEGRADED - 64K 1396.95 OFF OFF ON Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 465.76 GB 976773168 WD-WMASY6064174 p1 OK u0 465.76 GB 976773168 WD-WCANU1090078 p2 OK u0 465.76 GB 976773168 WD-WCANU1119743 p3 OK u0 465.76 GB 976773168 WD-WCANU1089924 p4 OK u1 465.76 GB 976773168 WD-WMASY8103731 p5 NOT-PRESENT - - - - p6 OK u1 465.76 GB 976773168 WD-WCAPW5103756 p7 OK u1 465.76 GB 976773168 WD-WCANU1125288 //cdfs> rescan Rescanning controller /c0 for units and drives ...Done. Found the following unit(s): [none]. Found the following drive(s): [none]. //cdfs> info c0 Unit UnitType Status %Cmpl Stripe Size(GB) Cache AVerify IgnECC ------------------------------------------------------------------------------ u0 RAID-5 OK - 64K 1396.95 ON OFF OFF u1 RAID-5 DEGRADED - 64K 1396.95 OFF OFF ON Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 465.76 GB 976773168 WD-WMASY6064174 p1 OK u0 465.76 GB 976773168 WD-WCANU1090078 p2 OK u0 465.76 GB 976773168 WD-WCANU1119743 p3 OK u0 465.76 GB 976773168 WD-WCANU1089924 p4 OK u1 465.76 GB 976773168 WD-WMASY8103731 p5 OK - 465.76 GB 976773168 WD-WCAPW2252807 p6 OK u1 465.76 GB 976773168 WD-WCAPW5103756 p7 OK u1 465.76 GB 976773168 WD-WCANU1125288 //cdfs> /c0/u1 start rebuild disk=5 ignoreecc Sending rebuild start request to /c0/u1 on 1 disk(s) [5] ... Done. //cdfs> info c0 Unit UnitType Status %Cmpl Stripe Size(GB) Cache AVerify IgnECC ------------------------------------------------------------------------------ u0 RAID-5 OK - 64K 1396.95 ON OFF OFF u1 RAID-5 REBUILDING 0 64K 1396.95 OFF OFF ON Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 465.76 GB 976773168 WD-WMASY6064174 p1 OK u0 465.76 GB 976773168 WD-WCANU1090078 p2 OK u0 465.76 GB 976773168 WD-WCANU1119743 p3 OK u0 465.76 GB 976773168 WD-WCANU1089924 p4 OK u1 465.76 GB 976773168 WD-WMASY8103731 p5 DEGRADED u1 465.76 GB 976773168 WD-WCAPW2252807 p6 OK u1 465.76 GB 976773168 WD-WCAPW5103756 p7 OK u1 465.76 GB 976773168 WD-WCANU1125288 //cdfs>