Can anybody tell me if my multipath o/p is fine?<div><br></div><div>I have a active/active setup and when I unplug the FC SAN cable on one of the ports of my HBA my host is being un responsive and need to reboot it.</div><div>
<br></div><div>When I do </div><div><br></div><div>multipath -ll</div><div><br></div><div>I can see:</div><div><br></div><div><div>[root@cvprd2 etc]# multipath -ll</div><div>mpath2 (360060e8004770d000000770d0000018c) dm-1 HITACHI,OPEN-V*10</div>
<div>[size=335G][features=1 queue_if_no_path][hwhandler=0][rw]</div><div>\_ round-robin 0 [prio=8][active]</div><div> \_ 6:0:0:1 sdc 8:32 [active][ready]</div><div> \_ 6:0:0:16385 sde 8:64 [active][ready]</div><div>
\_ 6:0:0:32769 sdg 8:96 [active][ready]</div><div> \_ 6:0:0:49153 sdi 8:128 [active][ready]</div><div> \_ 5:0:0:1 sdk 8:160 [active][ready]</div><div> \_ 5:0:0:16385 sdm 8:192 [active][ready]</div><div> \_ 5:0:0:32769 sdo 8:224 [active][ready]</div>
<div> \_ 5:0:0:49153 sdq 65:0 [active][ready]</div><div>mpath1 (360060e8004770d000000770d00000154) dm-0 HITACHI,OPEN-V*9</div><div>[size=301G][features=1 queue_if_no_path][hwhandler=0][rw]</div><div>\_ round-robin 0 [prio=8][active]</div>
<div> \_ 6:0:0:0 sdb 8:16 [active][ready]</div><div> \_ 6:0:0:16384 sdd 8:48 [active][ready]</div><div> \_ 6:0:0:32768 sdf 8:80 [active][ready]</div><div> \_ 6:0:0:49152 sdh 8:112 [active][ready]</div><div> \_ 5:0:0:0 sdj 8:144 [active][ready]</div>
<div> \_ 5:0:0:16384 sdl 8:176 [active][ready]</div><div> \_ 5:0:0:32768 sdn 8:208 [active][ready]</div><div> \_ 5:0:0:49152 sdp 8:240 [active][ready]</div><div>[root@cvprd2 etc]# </div><div><br></div><div><br></div><div>
--</div><div><br></div><div>But when I do "multipath -v2" i donot see anything..</div><div><br></div><div><br></div><div><div>[root@cvprd2 etc]# multipath -v2</div><div>[root@cvprd2 etc]# </div><div><br></div><div>
<br></div><div>--</div><div><br></div><div>My multipath.conf is as below:</div><div><br></div><div><div>[root@cvprd1 etc]# more multipath.conf </div><div># This is a basic configuration file with some examples, for device mapper</div>
<div># multipath.</div><div># For a complete list of the default configuration values, see</div><div># /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.defaults</div><div># For a list of configuration options with descriptions, see</div>
<div># /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.annotated</div><div><br></div><div><br></div><div># Blacklist all devices by default. Remove this to enable multipathing</div><div># on the default devices. </div>
<div>blacklist {</div><div> devnode "^sda"</div><div>}</div><div><br></div><div>## Use user friendly names, instead of using WWIDs as names.</div><div>defaults {</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>user_friendly_names yes</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>polling_interval 5</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>no_path_retry 3</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>failover immediate</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>path_grouping_policy multibus</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>rr_weight priorities</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>path_checker readsector0</div>
<div>}</div><div>devices {</div><div> device {</div><div> vendor "HITACHI"</div><div> product "OPEN-V"</div><div> path_grouping_policy multibus</div>
<div> path_checker readsector0</div><div> getuid_callout "/sbin/scsi_id -g -u -p0x80 -s /block/%n"</div><div> }</div><div>}</div><div>[root@cvprd1 etc]# </div>
<div><br></div><div><br></div><div>Thanks !</div><div>Paras</div><div><br></div><div><br></div><div><br></div></div></div><br><div class="gmail_quote">On Tue, Jan 12, 2010 at 10:37 AM, Paras pradhan <span dir="ltr"><<a href="mailto:pradhanparas@gmail.com">pradhanparas@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Upgrding the kernel to 2.6.18-164.10.1.el5xen brought back /dev/dm-* and now multipath -ll has the ouput.<div><br></div>
<div>I am curious about what has caused the lost of /dev/dm* in my previous kernel.</div><div><br></div>
<div>Any ideas?</div><div><br></div><font color="#888888"><div>Paras.</div></font><div><div></div><div class="h5"><div><br><br><div class="gmail_quote">On Mon, Jan 11, 2010 at 8:09 PM, Paras pradhan <span dir="ltr"><<a href="mailto:pradhanparas@gmail.com" target="_blank">pradhanparas@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yes every thing's loaded.<br><br>Here is the output:<br><br>[root@cvprd1 ~]# lsmod | grep dm<br>dm_round_robin 36801 0 <br>
rdma_cm 68565 1 ib_iser<br>ib_cm 73449 1 rdma_cm<br>
iw_cm 43465 1 rdma_cm<br>ib_sa 75209 2 rdma_cm,ib_cm<br>ib_core 105157 6 ib_iser,rdma_cm,ib_cm,iw_cm,ib_sa,ib_mad<br>ib_addr 41929 1 rdma_cm<br>dm_multipath 56153 1 dm_round_robin<br>
scsi_dh 41665 1 dm_multipath<br>dm_raid45 99401 0 <br>dm_message 36289 1 dm_raid45<br>dm_region_hash 46273 1 dm_raid45<br>dm_mem_cache 39489 1 dm_raid45<br>dm_snapshot 52105 0 <br>
dm_zero 35265 0 <br>dm_mirror 54737 0 <br>dm_log 44993 3 dm_raid45,dm_region_hash,dm_mirror<br>dm_mod 101521 11 dm_multipath,dm_raid45,dm_snapshot,dm_zero,dm_mirror,dm_log<br>
<br><br><br>Thanks<br><font color="#888888">Paras.</font><div><div></div><div><br><br><br><br><div class="gmail_quote">On Mon, Jan 11, 2010 at 6:33 PM, nate <span dir="ltr"><<a href="mailto:centos@linuxpowered.net" target="_blank">centos@linuxpowered.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex">
<div><div></div><div>Paras pradhan wrote:<br>
> Hi.<br>
><br>
> Somehow I do not see any out put using multipath -l or multipath -ll . But I<br>
> can see using dry run ie multipath -d.<br>
><br>
> Also I do not see /dev/dm-*<br>
><br>
> It was there before. How do I re claim it.<br>
<br>
</div></div>Are the modules loaded?<br>
<br>
[root@dc1-mysql001a:~]# lsmod | grep dm<br>
dm_zero 35265 0<br>
dm_mirror 60617 0<br>
dm_round_robin 36801 1<br>
dm_multipath 52945 2 dm_round_robin<br>
dm_mod 99737 17 dm_zero,dm_mirror,dm_multipath<br>
[root@dc1-mysql001a:~]# multipath -l<br>
350002ac0006a0714dm-1 3PARdata,VV<br>
[size=1.0T][features=0][hwhandler=0]<br>
\_ round-robin 0 [prio=0][active]<br>
\_ 1:0:0:3 sdc 8:32 [active][undef]<br>
\_ 1:0:1:3 sde 8:64 [active][undef]<br>
\_ 2:0:0:3 sdg 8:96 [active][undef]<br>
\_ 2:0:1:3 sdi 8:128 [active][undef]<br>
350002ac000790714dm-0 3PARdata,VV<br>
[size=2.0T][features=0][hwhandler=0]<br>
\_ round-robin 0 [prio=0][active]<br>
\_ 1:0:0:2 sdb 8:16 [active][undef]<br>
\_ 1:0:1:2 sdd 8:48 [active][undef]<br>
\_ 2:0:0:2 sdf 8:80 [active][undef]<br>
\_ 2:0:1:2 sdh 8:112 [active][undef]<br>
<br>
<br>
<br>
nate<br>
<br>
<br>
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</blockquote></div><br>
</div></div></blockquote></div><br></div>
</div></div></blockquote></div><br></div>