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Operating Systems Linux Red Hat Question about multipath
# 1  
Old 09-27-2013
Question about multipath
hi,
I've a question about multipath.
One server uses this configuration:

Code:
mpath02 (3600d000ff0d510cae5b8df4d01000000) dm-2 FSC,FibraCAT_SX
[size=1T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 0:0:3:2  sdq  8:64   [active][ready]
\_ round-robin 0 [prio=1][enabled]
 \_ 1:0:2:2  sdw  8:160  [active][ready]
\_ round-robin 0 [prio=1][enabled]
 \_ 1:0:5:2  sde  65:16  [active][ready]
\_ round-robin 0 [prio=1][enabled]
 \_ 0:0:7:2  sdt  65:128 [active][ready]


iostat report 90%-100% busy on sdq.

Code:
sdq            248.26     0.00 870.65  0.00 210228.86     0.00   241.46     1.56    1.79   1.01  88.11
sdq             281.00     0.00 964.50 25.50 236000.00   592.00   238.98     4.71    4.73   1.00  99.15

I think that a config like this:

Code:
mpath02 (3600d000ff0d510cae5b8df4d01000000) dm-2 FSC,FibraCAT_SX
[size=1T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=10][active]
 \_ 0:0:3:2  sdq  8:64   [active][ready]
 \_ 1:0:2:2  sdw  8:160  [active][ready]
\_ round-robin 0 [prio=50][enabled]
 \_ 1:0:5:2  sde  65:16  [active][ready]
 \_ 0:0:7:2  sdt  65:128 [active][ready]

is better.

What do you thinks?
Last edited by Don Cragun; 09-27-2013 at 10:31 AM.. Reason: Add CODE tags.
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