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Old 09-30-2010, 10:58 AM
Adam Carter
 
Default Normal disk speed?

Taring my mp3 collection from 2.5in 500MB internal sata drive (sda) to esata 3.5in 500MB drive (sdb) and it seems slow. In vmstat i can see that the external drive writes faster than the internal can read (external has periods of inactivity)

# time tar cf /mnt/usbdrive/mp3back.tar mp3/

real*** 10m9.679s
user*** 0m1.577s
sys*** 2m1.769s
# du -ks mp3/
21221661*** mp3/

So 21221MB in 610 seconds = 35 MB/s

# hdparm -t /dev/sda


/dev/sda:
*Timing buffered disk reads:* 220 MB in* 3.01 seconds =* 73.14 MB/sec (77 with --direct)

FWIW;
# hdparm /dev/sda

/dev/sda:
*multcount**** = 16 (on)
*IO_support*** =* 1 (32-bit)
*readonly***** =* 0 (off)

*readahead**** = 256 (on)
*geometry***** = 60801/255/63, sectors = 976773168, start = 0


So the should i expect filesystem (reiser3) and other overhead to cut
the read performance to less than half of what hdparm reports? Anything else i can look at to speed
it up? Im using CFQ io scheduler.
 

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