Sorry for this newbie question! I have a disk divided as follows: =================== Disk /dev/sdb: 56.9 GB, 56908316672 bytes 255 heads, 63 sectors/track, 6918 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 1 1167 9373896 83 Linux /dev/sdb2 1168 6918 46194907+ 5 Extended /dev/sdb5 1168 2322 9373896 83 Linux /dev/sdb6 2323 3477 9277506 83 Linux .... =================== I used blktrace to capture I/Os on sdb5 when I was trying to mount sdb5. This is a part of the output: =================== ... 251,32 0 25 0.000919000 3529 A RM 18752478 + 8 <- (251,37) 4560 251,32 0 26 0.000919657 3529 Q RM 18752478 + 8 [mount] 251,32 0 27 0.000920810 3529 G RM 18752478 + 8 [mount] 251,32 0 28 0.000922188 3529 P N [mount] 251,32 0 29 0.000923025 3529 I R 18752478 + 8 [mount] 251,32 0 30 0.000924439 3529 U N [mount] 1 251,32 0 31 0.000925877 3529 D R 18752478 + 8 [mount] 251,32 0 32 0.023385527 0 C R 18752478 + 8 [0] 251,32 0 33 0.023465706 3529 A R 27664918 + 8 <- (251,37) 8917000 251,32 0 34 0.023466398 3529 Q R 27664918 + 8 [mount] 251,32 0 35 0.023467922 3529 G R 27664918 + 8 [mount] .... =================== According to blktrace manual, such a number of 18752478 is known as a "starting block", followed by the size of request. If I understand correctly, sdb5 is in the range of blocks from 9373897 to 9373896+9373897-1=18747792. However, blktrace's output shows that a R request occurs on a block whose index is much larger than the range of the partition. How should I understand correctly the value of 18752478? Please help. Thank you -- Dan -- To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
