passwd: Authentication token lock busy
Solution would be: mount -o remount,rw /
Second Level Error:
block device /dev/VolGroup00/LogVol00 is write-protected, mounting read-only
Solution would be: fsck (yes simply type fsck)
yum install seeker seeker /dev/sda
Another benchmarking tool.
Benchmarking /dev/sda [83886080 blocks, 42949672960 bytes, 40 GB, 40960 MB, 42 GiB, 42949 MiB]
[512 logical sector size, 512 physical sector size]
Wait 30 seconds…………………………
Results: 679 seeks/second, 1.473 ms random access time (4756640 < offsets < 42946385220) We can get the average number of seeks per second, and calculated random access time of the disk Now, the utility reads only 512 bytes of data per one read operation, but internal kernel readahead mechanisms translate that to 4096 byte I/O operations. Multiplying 167 with 4096, we can estimate that disk is reading only 668 KB/sec. (Considering worste case senario).
hdparm -t /dev/sda
Timing buffered disk reads: 56 MB in 3.65 seconds = 15.34 MB/sec
Perform timings of device reads for benchmark and comparison purposes. For meaningful results, this operation should be repeated 2-3 times on an otherwise inactive system (no other active processes) with at least a couple of megabytes of free memory. This displays the speed of reading through the buffer cache to the disk without any prior caching of data. This measurement is an indication of how fast the drive can sustain sequential data reads under Linux, without any filesystem overhead. To ensure accurate measurements, the buffer cache is flushed during the processing of -t using the BLKFLSBUF ioctl. If the -T flag is also specified, then a correction factor based on the outcome of -T will be incorporated into the result reported for the -t operation.
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