I'm still getting the hang of iSCSI and multipath, so bear with me if
this is a FAQ that I've missed...
I have a host attaching to an MD3000i via iSCSI/dm-multipath that is
working but showing a lot of the following errors in syslog:
multipathd: sdc: readsector0 checker reports path is down
My initial impression is that sdc is likely the "passive" path (for
failover) whereas sdd is my active path:
# multipath -ll
sdc: checker msg is "readsector0 checker reports path is down"
mpath2 (36001ec9000f338370000000000000000) dm-2 DELL,Universal Xport
[size=20M][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:31 sdf 8:80 [active][ready]
mpath1 (36001ec9000f337dd0000000000000000) dm-1 DELL,Universal Xport
[size=20M][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:0:31 sde 8:64 [active][ready]
mpath0 (36001ec9000f337dd0000065b491854a4) dm-0 DELL,MD3000i
[size=150G][features=0][hwhandler=1 rdac]
\_ round-robin 0 [prio=3][active]
\_ 3:0:0:0 sdd 8:48 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:0 sdc 8:32 [failed][faulty]
# iscsiadm -m discovery -t sendtargets -p 192.168.132.101:3260
0.0.0.0:3260,1 iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
0.0.0.0:3260,2 iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
192.168.132.101:3260,1 iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
192.168.132.102:3260,2 iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
# iscsiadm -m session -P 1
Target: iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
Current Portal: 192.168.132.101:3260,1
Persistent Portal: 192.168.132.101:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:2738e0d3bd21
Iface IPaddress: 192.168.132.202
Iface HWaddress: default
Iface Netdev: default
SID: 1
iSCSI Connection State: LOGGED IN
iSCSI Session State: Unknown
Internal iscsid Session State: NO CHANGE
Current Portal: 192.168.132.102:3260,2
Persistent Portal: 192.168.132.102:3260,2
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:2738e0d3bd21
Iface IPaddress: 192.168.132.202
Iface HWaddress: default
Iface Netdev: default
SID: 2
iSCSI Connection State: LOGGED IN
iSCSI Session State: Unknown
Internal iscsid Session State: NO CHANGE
sde and sdf are the silly 20MB partition that the MD3000 creates and
I'm not using either.
My ultimate goal is to not have so many of the path is down errors
showing up in my syslog file (hundreds and hundreds of them). I'm not
sure if their presence is normal (indicative of a passive path) or
indicative of a problem.
Also, I'm not clear as to how I should identify which target
corresponds with which drive (sdc or sdd).
Any thoughts? I don't have direct access to the MD3000i
unfortunately... this is from a CentOS 5.2 system btw.
Ray
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