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Taring my mp3 collection from 2.5in 500MB internal sata drive (sda) to esata |
| 2 |
3.5in 500MB drive (sdb) and it seems slow. In vmstat i can see that the |
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external drive writes faster than the internal can read (external has |
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periods of inactivity) |
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# time tar cf /mnt/usbdrive/mp3back.tar mp3/ |
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|
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real 10m9.679s |
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user 0m1.577s |
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sys 2m1.769s |
| 10 |
# du -ks mp3/ |
| 11 |
21221661 mp3/ |
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|
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So 21221MB in 610 seconds = 35 MB/s |
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|
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# hdparm -t /dev/sda |
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|
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/dev/sda: |
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Timing buffered disk reads: 220 MB in 3.01 seconds = 73.14 MB/sec (77 |
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with --direct) |
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|
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FWIW; |
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# hdparm /dev/sda |
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|
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/dev/sda: |
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multcount = 16 (on) |
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IO_support = 1 (32-bit) |
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readonly = 0 (off) |
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readahead = 256 (on) |
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geometry = 60801/255/63, sectors = 976773168, start = 0 |
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So the should i expect filesystem (reiser3) and other overhead to cut the |
| 33 |
read performance to less than half of what hdparm reports? Anything else i |
| 34 |
can look at to speed it up? Im using CFQ io scheduler. |
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