我正在尝试将文件从 /backup/ 文件夹复制到 /backup/abc/，这花费了很多时间。在其他服务器上执行的复制操作非常快。
# df -HP
Filesystem Size Used Avail Use% Mounted on
/dev/sdc3 482G 351G 107G 77% /
tmpfs 4.2G 74k 4.2G 1% /dev/shm
/dev/sdc1 204M 36M 157M 19% /boot
/dev/sdb3 2.0T 590G 1.3T 32% /data
/dev/sda4 2.0T 705G 1.2T 38% /backup
与我拥有的其他服务器相比，磁盘的写入速度非常慢。这背后的原因是什么？
# hdparm -t /dev/sdc3
/dev/sdc3:
Timing buffered disk reads: 2 MB in 3.00 seconds = 682.67 kB/sec
# hdparm -t /dev/sdc1
/dev/sdc1:
Timing buffered disk reads: 2 MB in 4.10 seconds = 499.51 kB/sec
# hdparm -t /dev/sdb3
/dev/sdb3:
Timing buffered disk reads: read(2097152) returned 4096 bytes
# hdparm -t /dev/sda4
/dev/sda4:
Timing buffered disk reads: 4 MB in 6.10 seconds = 671.48 kB/sec
更新： 更多信息
# fdisk -l
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x3b011cfb
Device Boot Start End Blocks Id System
/dev/sda4 1 243201 1953512001 83 Linux
Partition 4 does not start on physical sector boundary.
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0000272a
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sdc2 26 1301 10240000 82 Linux swap / Solaris
/dev/sdc3 1301 60802 477940736 83 Linux