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Full Discussion: Question about multipath
Operating Systems Linux Red Hat Question about multipath Post 302857797 by davyp74 on Friday 27th of September 2013 09:12:13 AM
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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LEARN ABOUT DEBIAN

poe::component::dbiagent::queue

DBIAgent::Queue(3pm)					User Contributed Perl Documentation				      DBIAgent::Queue(3pm)

NAME

       POE::Component::DBIAgent::Queue -- Helper class for managing a round-robin queue of Po:Co:DBIAgent:Helper's.

SYNOPSIS

DESCRIPTION

   Methods
       This are the methods we recognize:

       init
	   init the queue (currently noop)

       add append argument to the queue

       clear
	   Clear the queue

       find_by_pid
	   Find the index of helper with specified pid

       find_by_wheelid
	   Find the index of helper with specified wheel id

       remove_by_pid
	   Remove helper with specified pid

       remove_by_wheelid
	   Remove helper with specified wheel id

       next
	   Get next helper off the head of the queue (and put it back on the end (round robin))

       make_next
	   Force the helper with the specified wheel id to the head of the queue.

       exit_all
	   Tell all our helpers to exit gracefully.

       kill_all
	   Send the specified signal (default SIGTERM) to all helper processes

AUTHOR

       This module has been fine-tuned and packaged by Rob Bloodgood <robb@empire2.com>.  However, most of the code came directly from Fletch
       <fletch@phydeaux.org> and adapted for the release of POE::Component::DBIAgent.  Thank you, Fletch!

       However, I own all of the bugs.

       This module is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2008-01-18						      DBIAgent::Queue(3pm)
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