05-31-2016
What do you call multipath? Are you talking of PVs seen by HBAs ?
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1. Solaris
Hello everybody...
I have a Server conected to a Disk Array through 2 canals of FiberChannel... I've installed RedHat Advance Server 3 and of course i see two device files that refer the same disk: for example: /dev/sda and /dev/sdb are refered to the same Lun... This is the same case for a new... (2 Replies)
Discussion started by: lenux78
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2. UNIX for Dummies Questions & Answers
Hi..
when i delete a Lun from a Array on a SAN, and again when i create a Lun it shows that the newly created Lun has the ID of the Old deleted Lun which is leading to data corruption. All this is handled by the Multipath software. can anybody help. (0 Replies)
Discussion started by: Praveen13
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3. Red Hat
I don't undestand how to combine 4 nics in order to use DM Multipath. Do I have to install each nic with its IP address? If yes, do I need a group IP address? This concept is not clear for me.
The connection beetwen the server (DELL Poweredge T710) and the SAN through iscsi works well, I used... (1 Reply)
Discussion started by: gnupinux
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4. Red Hat
Hi All,
When I execute multipath -ll command that time display only 3 path (mpath1,mpath2 and mpath5), not display other 2 path (mpath3 and mpath4). I have configure 5 path in /etc/multipath.conf file. What is the reason behind it. Please help me.
Please find below the output :
... (5 Replies)
Discussion started by: mnmonu
5 Replies
5. Red Hat
Hi All,
When I execute "multipath -ll" command that time display only 3 path (orafra2,oradata2 and oradata1), not display other 2 path (orafra1 and data1). I have configure 5 path in "/etc/multipath.conf" file. What is the reason behind it. Please help me.
Please find below some output for... (4 Replies)
Discussion started by: mnmonu
4 Replies
6. Ubuntu
Hello,
i have a problem with the multipath tools configuration.
i can't remove the local disk paths.
the multipath.conf archives configuration is:
---------------------------------------------------------
$ cat /etc/multipath.conf
blacklist{
devnode cciss
devnode fd
... (0 Replies)
Discussion started by: FeeII
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7. Red Hat
hi,
I've a question about multipath.
One server uses this configuration:
mpath02 (3600d000ff0d510cae5b8df4d01000000) dm-2 FSC,FibraCAT_SX
\_ round-robin 0
\_ 0:0:3:2 sdq 8:64
\_ round-robin 0
\_ 1:0:2:2 sdw 8:160
\_ round-robin 0
\_ 1:0:5:2 sde 65:16
\_ round-robin... (0 Replies)
Discussion started by: davyp74
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8. Red Hat
Hi,
I am running RHEL6 on a physical node (HP Proliant).
If it normal for the root device to get listed in the "multipath -ll" output? (Listed below as dm-4, HP LOGICAL VOLUME).
i.e.
asm-data (360a98000424a414b453f443548503644) dm-3 NETAPP,LUN
size=768G features='4 queue_if_no_path... (0 Replies)
Discussion started by: Duffs22
0 Replies
9. UNIX for Advanced & Expert Users
Hi,
I have a RAC installation on 2 solaris 11 nodes. (With ASM)
Disks' mpath are managed by EMC Powerpath on both nodes.
I want to migrate mpath software to Solaris multipath without downtime.
My plan is first migrate node1 to solaris mpath, then after some days migrate node2 to sol.mpath.
My... (5 Replies)
Discussion started by: vlkkck
5 Replies
10. Red Hat
Hi,
In a RHEL 5 box, I have just added new multipath configurations in /etc/multipath.conf :
blacklist_exceptions {
wwid "360002ac0000000000000008e0001ee00"
wwid "360002ac0000000000000008f0001ee00"
wwid "360002ac000000000000000900001ee00"
wwid... (0 Replies)
Discussion started by: anaigini45
0 Replies
LEARN ABOUT LINUX
multipath
MULTIPATH(8) Linux Administrator's Manual MULTIPATH(8)
NAME
multipath - Device mapper target autoconfig
SYNOPSIS
multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-t|-F-B] [-p failover|multibus|group_by_serial|group_by_prio|group_by_node_name] [device]
DESCRIPTION
multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them
OPTIONS
-v level
verbosity, print all paths and multipaths
0 no output
1 print the created or updated multipath names only, for use to feed other tools like kpartx
2 + print all info : detected paths, coalesced paths (ie multipaths) and device maps
-h print usage text
-d dry run, do not create or update devmaps
-l show the current multipath topology from information fetched in sysfs and the device mapper
-ll show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
-f flush a multipath device map specified as parameter, if unused
-F flush all unused multipath device maps
-t print internal hardware table to stdout
-r force devmap reload
-B treat the bindings file as read only
-p policy
force new maps to use the specified policy:
failover 1 path per priority group
multibus all paths in 1 priority group
group_by_serial
1 priority group per serial
group_by_prio
1 priority group per priority value. Priorities are determined by callout programs specified as a global, per-con-
troller or per-multipath option in the configuration file
group_by_node_name
1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.
Existing maps are not modified.
device update only the devmap the path pointed by device is in. device is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or
major:minor format. device may alternatively be a multipath mapname
SEE ALSO
multipathd(8), multipath.conf(5), kpartx(8), udev(8), dmsetup(8) hotplug(8)
AUTHORS
multipath was developed by Christophe Varoqui, <christophe.varoqui@opensvc.com> and others.
July 2006 MULTIPATH(8)