[olug] Slow read speeds-SuSE

[Craig Wolf]

More info.  
 
Write example iostat output:
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.69    0.00    0.70    0.00    0.00   98.61
 
Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00    13.53    0.00    1.40     0.00    59.73    85.33     0.00    0.19   0.19   0.03
cciss/c0d1        0.00   309.60    0.07   34.60     0.27  1409.07    81.31     0.01    0.34   0.15   0.53
dm-0              0.00     0.00    0.07  352.27     0.27  1409.07     8.00     0.15    0.44   0.02   0.53
dm-1              0.00     0.00    0.07  352.27     0.27  1409.07     8.00     0.15    0.44   0.02   0.53
dm-2              0.00     0.00    0.07  352.27     0.27  1409.07     8.00     0.15    0.44   0.02   0.53
Read iostat output:
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.30    0.00    0.14    0.00    0.00   99.56
 
Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00     2.67    0.00    0.87     0.00    14.13    32.62     0.00    0.00   0.00   0.00
cciss/c0d1        0.00     3.73    0.13    0.67     0.53    17.60    45.33     0.00    3.67   3.33   0.27
dm-0              0.00     0.00    0.13    4.40     0.53    17.60     8.00     0.02    3.94   0.59   0.27
dm-1              0.00     0.00    0.13    4.40     0.53    17.60     8.00     0.02    3.94   0.59   0.27
dm-2              0.00     0.00    0.13    4.40     0.53    17.60     8.00     0.02    3.94   0.59   0.27


>>> "Craig Wolf" <CJWolf at mpsomaha.org> 4/28/2010 >>>
Ok, my backups from one of my linux servers takes 5 days to finish...my window is 36 hours, not working right.  Throughput of about 1.5GB/hour.  
So in my testing, copying a 158MB directory to the server takes about 1 Minute 5 seconds.  Copying same structure off the box takes almost 7 minutes.  Network switches show no issues/error.  iostat shows slow to no throughput at all on read.  

SO, the million dollar question is, what should I look at for fixing this??  Do I use hdparm?

TIA!!


Craig Wolf
Linux Server Support
Data Backups Administrator
Desktop/Network Specialist
Desk: (402)715-6283
Cell: (402)510-0301
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