SCSI Primary Commands - 2.pdf

More documents

Recommendations

Info

T10/1236-D Revision 20 18 July 20017.10.4.3 Persistent Reservations TypeThe value in the TYPE field shall specify the characteristics of the persistent reservation being established for alldata blocks within the element or within the logical unit. Table 72 defines the characteristics of the different typevalues. For each persistent reservation type, table 72 lists code value and describes the required device serversupport. In table 72, the description of required device server support is divided into two paragraphs. The firstparagraph defines the required handling for read operations. The second paragraph defines the required handlingfor write operations.Code Name DescriptionTable 72 — Persistent reservation type codes0h1h2h3h4h5h6h7h - FhWriteExclusiveExclusiveAccessWriteExclusive –RegistrantsOnlyExclusiveAccess –RegistrantsOnlyReservedObsoleteReads Shared: Any application client on any initiator may initiate tasks that requesttransfers from the storage medium or cache of the logical unit to the initiator.Writes Exclusive: Any task from any initiator other than the initiator holding thepersistent reservation that requests a transfer from the initiator to the storagemedium or cache of the logical unit shall be terminated with RESERVATIONCONFLICT status.ObsoleteReads Exclusive: Any task from any initiator other than the initiator holding thepersistent reservation that requests a transfer from the storage medium or cache ofthe logical unit to the initiator shall be terminated with RESERVATION CONFLICTstatus.Writes Exclusive: Any task from any initiator other than the initiator holding thepersistent reservation that requests a transfer from the initiator to the storagemedium or cache of the logical unit shall be terminated with RESERVATIONCONFLICT status.ObsoleteReads Shared: Any application client on any initiator may initiate tasks that requesttransfers from the storage medium or cache of the logical unit to the initiator.Writes Exclusive: A task that requests a transfer to the storage medium or cacheof the logical unit from an initiator that is not currently registered with the deviceserver shall be terminated with RESERVATION CONFLICT status.Reads Exclusive: A task that requests a transfer from the storage medium orcache of the logical unit to an initiator that is not currently registered with the deviceserver shall be terminated with RESERVATION CONFLICT status.Writes Exclusive: A task that requests a transfer to the storage medium or cacheof the logical unit from an initiator that is not currently registered with the deviceserver shall be terminated with RESERVATION CONFLICT status.108 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 207.11 PERSISTENT RESERVE OUT command7.11.1 PERSISTENT RESERVE OUT command introductionThe PERSISTENT RESERVE OUT command (see table 73) is used to request service actions that reserve alogical unit or element for the exclusive or shared use of a particular initiator. The command uses other serviceactions to manage and remove such reservations. The command shall be used in conjunction with thePERSISTENT RESERVE IN command and shall not be used with the RESERVE and RELEASE commands.Initiators performing PERSISTENT RESERVE OUT service actions are identified by a reservation key provided bythe application client. An application client may use the PERSISTENT RESERVE IN command to obtain the reservationkey for the initiator holding a persistent reservation and may use the PERSISTENT RESERVE OUTcommand to preempt that reservation.Table 73 — PERSISTENT RESERVE OUT commandBitByte7 6 5 4 3 2 1 00 OPERATION CODE (5Fh)1 Reserved SERVICE ACTION2 SCOPE TYPE3 Reserved4 Reserved5 Reserved6 Reserved7 (MSB)PARAMETER LIST LENGTH (18h)8 (LSB)9 CONTROLIf a PERSISTENT RESERVE OUT command is attempted, but there are insufficient device server resources tocomplete the operation, the device server shall return a CHECK CONDITION status. The sense key shall be set toILLEGAL REQUEST and the additional sense data shall be set to INSUFFICIENT REGISTRATION RESOURCES.The PERSISTENT RESERVE OUT command contains fields that specify a persistent reservation service action,the intended scope of the persistent reservation, and the restrictions caused by the persistent reservation. TheTYPE and SCOPE fields are defined in 7.10.4.2 and 7.10.4.3. If a SCOPE field specifies a scope that is not implemented,the device server shall return a CHECK CONDITION status. The sense key shall be set to ILLEGALREQUEST and additional sense data shall be set to INVALID FIELD IN CDB.Fields contained in the PERSISTENT RESERVE OUT parameter list specify the information required to perform aparticular persistent reservation service action.The parameter list shall be 24 bytes in length and the PARAMETER LIST LENGTH field shall contain 24 (18h). If theparameter list length is not 24, the device server shall return a CHECK CONDITION status. The sense key shall beset to ILLEGAL REQUEST and the additional sense data shall be set to PARAMETER LIST LENGTH ERROR.dpANS SCSI Primary Commands - 2 (SPC-2) 109
Page 1 and 2:
dpANSProjectT10/1236-DRevision 2018
Page 3:
DraftANSI (r)NCITS.351:200xAmerican
Page 6 and 7:
T10/1236-D Revision 20 18 July 2001
Page 8 and 9:
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77: T10/1236-D Revision 20 18 July 2001
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Page 188 and 189:
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Page 214 and 215:
Page 216 and 217:
Page 218 and 219:
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
Page 232 and 233:
Page 234 and 235:
Page 236 and 237:
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 254 and 255:
Page 256 and 257:
Page 258 and 259:
Page 260 and 261:
Page 262 and 263:
Page 264 and 265:
Page 266 and 267:
Page 268 and 269:
Page 270 and 271:
Page 272 and 273:
Page 274 and 275:
Page 276 and 277:
Page 278 and 279:
Page 280 and 281:
Page 282 and 283:
Page 284 and 285:
Page 286 and 287:
Page 288 and 289:
Page 290 and 291:
Page 292 and 293:
show all

SCSI Primary Commands - 2.pdf

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?