[ovirt-users] iscsi config for dell ps series
Marcin Kruk
askifyouneed at gmail.com
Sun Apr 2 21:40:46 UTC 2017
In my perspective, the ovirt developers put very general configuration of
multipath.conf file, which in their opinion should work with as much as
posslible arrays.
So you should modify this file and try to do some tests, plug in, plug out
links etc.
If you want to get luns picture, you should better use: iscsiadm -m session
-P 3.
2017-03-28 18:25 GMT+02:00 Gianluca Cecchi <gianluca.cecchi at gmail.com>:
>
> Hello,
> I'm configuring an hypervisor for iSCSI Dell PS Series
> It is a CentOS 7.3 + updates server.
> The server has been already added to oVirt as a node, but without any
> storage domain configured yet.
> It has access to one lun that will become the storage domain one.
>
> Default oVirt generated multipath.conf is like this:
>
> defaults {
> polling_interval 5
> no_path_retry fail
> user_friendly_names no
> flush_on_last_del yes
> fast_io_fail_tmo 5
> dev_loss_tmo 30
> max_fds 4096
> }
>
> devices {
> device {
> # These settings overrides built-in devices settings. It does not
> apply
> # to devices without built-in settings (these use the settings in
> the
> # "defaults" section), or to devices defined in the "devices"
> section.
> # Note: This is not available yet on Fedora 21. For more info see
> # https://bugzilla.redhat.com/1253799
> all_devs yes
> no_path_retry fail
> }
> }
>
>
> Apparently in device-mapper-multipath there is no builtin for this
> combination
>
> Vendor: EQLOGIC Model: 100E-00 Rev: 8.1
>
> So, with the oVirt provided configuration a "show config" for multipath
> reports something like this at the end:
>
> polling_interval 5
> path_selector "service-time 0"
> path_grouping_policy "failover"
> path_checker "directio"
> rr_min_io_rq 1
> max_fds 4096
> rr_weight "uniform"
> failback "manual"
> features "0"
>
> and multipath layout this way
>
> [root at ov300 etc]# multipath -l
> 364817197b5dfd0e5538d959702249b1c dm-3 EQLOGIC ,100E-00
> size=1.0T features='0' hwhandler='0' wp=rw
> |-+- policy='service-time 0' prio=0 status=active
> | `- 7:0:0:0 sde 8:64 active undef running
> `-+- policy='service-time 0' prio=0 status=enabled
> `- 8:0:0:0 sdf 8:80 active undef running
> [root at ov300 etc]#
>
> Following recommendations from Dell here:
> http://en.community.dell.com/techcenter/extras/m/white_papers/20442422
>
> I should put into defaults section these directives:
>
> defaults {
> polling_interval 10
> path_selector "round-robin 0"
> path_grouping_policy multibus
> path_checker tur
> rr_min_io_rq 10
> max_fds 8192
> rr_weight priorities
> failback immediate
> features 0
> }
>
> I'm trying to mix EQL and oVirt reccomendations to have the best for my
> use
> and arrived at this config (plus a blacklist section with my internal hd
> and my flash wwids that is not relevant here):
>
> # VDSM REVISION 1.3
> # VDSM PRIVATE
>
> defaults {
> polling_interval 5
> no_path_retry fail
> user_friendly_names no
> flush_on_last_del yes
> fast_io_fail_tmo 5
> dev_loss_tmo 30
> # Default oVirt value overwritten
> # max_fds 4096
> #
> max_fds 8192
> }
>
> devices {
> device {
> # These settings overrides built-in devices settings. It does not
> apply
> # to devices without built-in settings (these use the settings in
> the
> # "defaults" section), or to devices defined in the "devices"
> section.
> # Note: This is not available yet on Fedora 21. For more info see
> # https://bugzilla.redhat.com/1253799
> all_devs yes
> no_path_retry fail
> }
> device {
> vendor "EQLOGIC"
> product "100E-00"
> # Default EQL configuration overwritten by oVirt default
> # polling_interval 10
> #
> path_selector "round-robin 0"
> path_grouping_policy multibus
> path_checker tur
> rr_min_io_rq 10
> rr_weight priorities
> failback immediate
> features "0"
> }
> }
>
> After activating this config I have this mutipath layout
>
> [root at ov300 etc]# multipath -l
> 364817197b5dfd0e5538d959702249b1c dm-3 EQLOGIC ,100E-00
> size=1.0T features='0' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=0 status=active
> |- 7:0:0:0 sde 8:64 active undef running
> `- 8:0:0:0 sdf 8:80 active undef running
> [root at ov300 etc]#
>
> NOTE: at this moment the storage is not yet configured as a storage domain.
> I also changed /etc/iscsi/iscsd.conf and sysctl.d parameters as from EQL
> doc indications
>
> From an iSCSI initiator point of view:
>
> [root at ov300 ~]# iscsiadm -m session
> tcp: [1] 10.10.100.9:3260,1 iqn.2001-05.com.equallogic:4-771816-e5d0dfb59-1c9b240297958d53-ovsd3910
> (non-flash)
> tcp: [2] 10.10.100.9:3260,1 iqn.2001-05.com.equallogic:4-771816-e5d0dfb59-1c9b240297958d53-ovsd3910
> (non-flash)
> [root at ov300 ~]#
>
> [root at ov300 ~]# iscsiadm -m session -P 1
> Target: iqn.2001-05.com.equallogic:4-771816-e5d0dfb59-1c9b240297958d53-ovsd3910
> (non-flash)
> Current Portal: 10.10.100.41:3260,1
> Persistent Portal: 10.10.100.9:3260,1
> **********
> Interface:
> **********
> Iface Name: ip1p1
> Iface Transport: tcp
> Iface Initiatorname: iqn.1994-05.com.redhat:f2d7fc1e2fc
> Iface IPaddress: 10.10.100.87
> Iface HWaddress: <empty>
> Iface Netdev: <empty>
> SID: 1
> iSCSI Connection State: LOGGED IN
> iSCSI Session State: LOGGED_IN
> Internal iscsid Session State: NO CHANGE
> Current Portal: 10.10.100.42:3260,1
> Persistent Portal: 10.10.100.9:3260,1
> **********
> Interface:
> **********
> Iface Name: ip1p2
> Iface Transport: tcp
> Iface Initiatorname: iqn.1994-05.com.redhat:f2d7fc1e2fc
> Iface IPaddress: 10.10.100.87
> Iface HWaddress: <empty>
> Iface Netdev: <empty>
> SID: 2
> iSCSI Connection State: LOGGED IN
> iSCSI Session State: LOGGED_IN
> Internal iscsid Session State: NO CHANGE
> [root at ov300 ~]#
>
> Do you think it is ok?
>
> Thanks for any comments,
>
> Gianluca
>
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>
>
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