VSAN-Troubleshooting-Reference-Manual

Recommendations

Info

Diagnostics and Troubleshooting Reference Manual – Virtual SAN Checking storage controller/adapter supportability The first area of focus is whether or not the HP Smart Array 410i is on the VCG and if it is supported. From the VCG for Virtual SAN, select the I/O Controller, then HP as the brand name. This will search all releases and all device types. Click on the update and view results to see a list of supported HP controllers: There is no entry for the HP Smart Array 410i, which implies that this is not a supported controller for Virtual SAN and therefore should not be used with Virtual SAN. However, this is the status right now – this may change in the future. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 38
Diagnostics and Troubleshooting Reference Manual – Virtual SAN Understanding RAID-0 versus pass-through In the “Feature” column above, you can see references to RAID-0 and Pass-Through. (Pass-through is sometimes referred to as JBOD or HBA mode). This is a reference to how controllers present their magnetic disks and flash devices (SSD) to ESXi hosts. It means that certain controllers are only supported when they present their disks directly to the ESXi hosts participating in Virtual SAN. Other controllers are only supported when they present each disk to the ESXi host as a RAID-0 volume. Some controllers can support both pass-through and RAID-0 volumes. Pass-through is preferred. In certain cases, ESXi cannot detect disks on a controller unless they are placed in pass-through mode. Configuring each disk as a “RAID-0” group of one allows them to be detected by Virtual SAN. Caution: If a controller is supported in RAID-0 mode only, and the disks are configured in pass-through mode, some disks might encounter permanent errors frequently which results in VM objects going degraded. For the configuration to be supported, their disks need to be reconfigured as RAID-0. Therefore if the VCG says use RAID-0, use RAID-0 and not pass-through, even though it might appear to work. This misconfiguration and failure to adhere to the VCG has led to a number of escalations in the past. Ensure this is checked before deployment. This will have to be done via the BIOS of the card, or via third party tools. Also note that pass-through is preferred over RAID-0 for ease of disk drive replacement. When a drive needs replacing, if it is in pass-through mode, it is a simple matter of plug and replace. When RAID-0 is configured on the drive, this is an additional step that needs to be carried out on the new disk before the drive can be fully replaced. Another caveat of using RAID 0 is that the disk type and SMART (Self-Monitoring, Analysis and Reporting Technology) information is not passed to the ESXi host because the controller blocks it. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 39
Page 1 and 2: Diagnostics and Troubleshooting Gui
Page 3 and 4: Diagnostics and Troubleshooting Ref
Page 37: Diagnostics and Troubleshooting Ref
Page 89 and 90:
Diagnostics and Troubleshooting Ref
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289 and 290:
Page 291 and 292:
Page 293 and 294:
Page 295:
show all

VSAN-Troubleshooting-Reference-Manual

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

Delete template?

Save as template?