I am experiencing disk performance issues (very slow) with hardware and software combo listed below. Poweredge 2450 Perc 3/si controller. RH linux ES3 (2.4.21-4.Elsmp) 4 x 73GB scsi (In a RAID 5 set) This server was previously running RH 7.3 with a 34GB mirror set with no issue So far I have updated the firmware of the card to Version 2.8.0.6092, Rev. A13 And have updated the aacraid driver to aacraid-1.1.4-2302 Neither of the above have had any impact. This machine is freshly installed and has no load to speak of yet As an indicator of performance here is what I get from hdparm. /dev/sda2: Timing buffer-cache reads: 780 MB in 2.00 seconds = 390.00 MB/sec Timing buffered disk reads: 22 MB in 3.20 seconds = 6.88 MB/sec [root@benidorm root]# hdparm -tT /dev/sda1 /dev/sda1: Timing buffer-cache reads: 788 MB in 2.00 seconds = 394.00 MB/sec Timing buffered disk reads: 26 MB in 3.02 seconds = 8.61 MB/sec When I do disk writes the system pretty much locks up in terms of doing anything else until it's finished. The following is a vmstat when the system is idle vmstat 1 procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 0 0 0 1541840 23028 127984 0 0 22 4 80 85 1 0 1 98 0 0 0 1541840 23028 127984 0 0 0 0 166 165 0 0 0 100 0 0 0 1541840 23028 127984 0 0 0 0 171 172 0 0 0 100 0 0 0 1541840 23028 127984 0 0 0 0 170 179 0 0 0 100 0 0 0 1541824 23044 127984 0 0 0 48 174 180 0 0 0 100 0 0 0 1541824 23044 127984 0 0 0 0 166 165 0 0 0 100 0 0 0 1541824 23044 127984 0 0 0 0 171 160 0 0 0 100 0 0 0 1541824 23044 127984 0 0 0 0 164 170 0 0 0 100 2 0 0 1541824 23044 127984 0 0 0 0 169 167 0 0 0 100 0 0 0 1541816 23052 127984 0 0 0 44 178 178 0 0 0 100 0 0 0 1541816 23052 127984 0 0 0 0 163 161 0 0 0 100 0 0 0 1541816 23052 127984 0 0 0 0 164 160 0 0 0 100 1 0 0 1541816 23052 127984 0 0 0 0 163 165 0 0 0 100 This is what happens when I run 'dd if=/dev/zero of=test bs=1024000 count=500' [root@benidorm raid]# vmstat 1 procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 0 0 0 1539248 23168 127984 0 0 22 4 80 86 1 0 1 98 0 0 0 1539248 23168 127984 0 0 0 0 202 226 0 0 0 100 0 0 0 1539248 23168 127984 0 0 0 0 445 458 0 0 0 99 0 1 0 1539196 23196 127984 0 0 28 0 239 258 0 0 5 95 2 0 0 1438304 23356 227984 0 0 28 14992 561 329 0 46 11 43 1 0 0 1438304 23356 227984 0 0 0 0 254 238 0 0 0 100 2 0 0 1438304 23356 227984 0 0 0 0 348 331 0 0 0 100 0 0 0 1438304 23356 227984 0 0 0 0 311 404 0 0 0 100 0 0 0 1438304 23356 227984 0 0 0 0 213 218 0 0 0 100 1 2 0 1437672 23360 227984 0 0 0 63704 826 371 0 4 57 38 0 2 0 1437668 23360 227984 0 0 0 8192 313 184 0 0 50 50 0 2 0 1437664 23360 227984 0 0 0 8192 310 166 0 0 50 50 0 2 0 1437652 23360 227984 0 0 0 5040 337 199 0 1 49 50 2 2 0 1437652 23360 227984 0 0 0 0 332 190 0 0 50 50 0 2 0 1437652 23360 227984 0 0 0 370 522 379 0 0 50 50 0 2 0 1437652 23360 227984 0 0 0 0 417 285 0 0 50 50 0 0 0 1437644 23372 227984 0 0 0 120 322 216 0 0 7 92 0 0 0 1437644 23372 227984 0 0 0 0 275 254 1 0 0 100 procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 3 0 0 1437644 23372 227984 0 0 0 0 279 282 0 0 0 100 0 0 0 1437636 23380 227984 0 0 0 16 597 617 1 0 15 83 0 0 0 1437632 23380 227984 0 0 0 0 603 598 3 0 0 97 0 0 0 1437632 23380 227984 0 0 0 0 192 188 0 0 0 100 0 0 0 1437632 23380 227984 0 0 0 0 200 200 0 1 0 99 1 0 0 1437632 23380 227984 0 0 0 0 188 189 0 0 0 100 1 0 0 1437628 23388 227984 0 0 0 16 215 204 0 0 0 100 0 0 0 1437628 23388 227984 0 0 0 0 289 296 1 0 0 99 [root@benidorm raid]# vmstat 1 procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 2 0 0 1225320 23700 431252 0 0 22 12 81 86 1 0 1 98 1 2 0 1113708 23816 538284 0 0 4 42376 334 176 0 51 8 42 1 3 0 1053544 23876 595980 0 0 4 23108 607 289 0 29 72 0 0 2 0 1020184 23908 627984 0 0 0 10492 541 388 0 14 50 36 0 2 0 1020184 23908 627984 0 0 0 8192 457 319 1 0 50 49 0 2 0 1020184 23908 627984 0 0 0 8192 374 244 2 0 50 47 0 2 0 1020184 23908 627984 0 0 0 10560 411 284 0 0 50 50 1 2 0 1020184 23908 627984 0 0 0 6720 307 178 2 0 50 47 0 2 0 1020184 23908 627984 0 0 0 8256 398 333 1 0 50 48 0 2 0 1020184 23908 627984 0 0 0 10240 305 174 1 0 50 48 0 2 0 1020184 23908 627984 0 0 0 8256 371 233 1 1 49 49 0 2 0 1020184 23908 627984 0 0 0 10368 319 182 2 1 48 48 0 2 0 1020184 23908 627984 0 0 0 10432 313 168 5 1 49 45 0 2 0 1020184 23908 627984 0 0 0 8640 294 171 1 3 52 44 0 2 0 1020184 23908 627984 0 0 0 8384 297 171 0 0 49 50 0 2 0 1020184 23908 627984 0 0 0 8256 309 178 0 1 49 50 0 2 0 1020184 23908 627984 0 0 0 8512 297 179 0 1 49 50 0 2 0 1020184 23908 627984 0 0 0 8832 369 213 0 1 49 50 procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 1 2 0 1020184 23908 627984 0 0 0 10240 361 238 1 0 49 50 0 2 0 1020184 23908 627984 0 0 0 8128 300 181 0 0 50 50 0 2 0 1020184 23908 627984 0 0 0 8192 332 225 0 0 51 50 0 2 0 1020184 23908 627984 0 0 0 10624 488 343 1 1 48 50 0 2 0 1020184 23908 627984 0 0 0 8320 304 167 0 1 48 50 0 2 0 1020184 23908 627984 0 0 0 8704 302 180 1 1 49 50 0 2 0 1020184 23908 627984 0 0 0 10304 308 178 0 1 49 50 0 2 0 1020184 23908 627984 0 0 0 8384 304 178 1 0 48 50 0 2 0 1020184 23908 627984 0 0 0 8960 306 196 0 2 48 50 0 2 0 1020184 23908 627984 0 0 0 8192 316 191 1 0 49 50 0 2 0 1020184 23908 627984 0 0 0 8192 348 239 1 1 48 50 0 2 0 1020184 23908 627984 0 0 0 8192 301 176 1 1 48 50 0 2 0 1020184 23908 627984 0 0 0 10240 390 263 1 1 48 50 0 3 0 1020184 23908 627984 0 0 0 8188 399 271 2 2 47 50 0 3 0 1020184 23908 627984 0 0 0 11136 331 185 2 0 48 50 1 3 0 1020184 23908 627984 0 0 0 8256 353 233 1 1 47 50 0 3 0 1020184 23908 627984 0 0 0 8192 302 182 2 0 54 43 0 3 0 1020180 23908 627984 0 0 0 7132 292 186 3 2 95 0 procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 1 4 0 1019896 23908 627988 0 0 0 8132 350 217 3 1 96 0 0 4 0 1019896 23908 627988 0 0 0 7380 299 183 2 1 96 0 1 4 0 1019896 23908 627988 0 0 0 7292 361 223 2 3 96 0 1 4 0 1019896 23908 627988 0 0 0 10920 357 207 1 3 96 0 0 4 0 1019892 23916 627988 0 0 0 9916 327 192 2 8 90 0 1 4 0 1019892 23916 627988 0 0 0 8832 333 180 5 3 92 0 0 4 0 1019892 23916 627988 0 0 0 10560 327 178 0 0 100 0 0 4 0 1019880 23924 627988 0 0 0 10892 326 175 0 1 99 0 0 4 0 1019880 23924 627988 0 0 0 8384 294 173 0 0 100 0 1 4 0 1019880 23924 627988 0 0 0 8832 313 168 0 1 99 0 1 4 0 1019880 23924 627988 0 0 0 10368 432 332 0 0 100 0 0 4 0 1019880 23924 627988 0 0 0 8128 371 290 0 0 100 0 0 4 0 1019880 23924 627988 0 0 0 8192 307 166 0 1 100 0 0 4 0 1019880 23924 627988 0 0 0 8576 297 168 0 0 100 0 0 4 0 1019880 23924 627988 0 0 0 8768 299 175 0 0 100 0 1 3 0 1019880 23924 627988 0 0 0 5944 299 177 0 0 100 0 1 3 0 1019880 23924 627988 0 0 0 0 306 156 0 0 100 0 0 3 0 1019880 23924 627988 0 0 0 0 300 158 0 0 100 0 This is the container config output from aafcli _container show > cache 0 Executing: container show cache 0 Global Container Read Cache Size : 0 Global Container Write Cache Size : 51380224 Read Cache Setting : ENABLE Write Cache Setting : ENABLE ALWAYS Write Cache Status : Active, not protected, battery not present The write cache setting was previously 'enable when protected'. I changed it to enable always but it had no impact. I'm not sure where to go with this now. Possibly trying to boot off knoppix or something to see if a different kernel changes things. If anyone has any suggestions I'd be very grateful. Thanks Zoe - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
