Re: [ovirt-users] iscsi config for dell ps series

[Marcin Kruk]

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 :

>
> 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_interval5
> no_path_retry   fail
> user_friendly_names no
> flush_on_last_del   yes
> fast_io_fail_tmo5
> dev_loss_tmo30
> 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_devsyes
> 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@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@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_interval10
> path_selector   "round-robin 0"
> path_grouping_policymultibus
> path_checkertur
> rr_min_io_rq10
> max_fds 8192
> rr_weight   priorities
> failbackimmediate
> features0
> }
>
> 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_interval5
> no_path_retry   fail
> user_friendly_names no
> flush_on_last_del   yes
> fast_io_fail_tmo5
> dev_loss_tmo30
> #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_devsyes
> no_path_retry   fail
> }
> device {
> vendor  "EQLOGIC"
> product "100E-00"
> #Default EQL configuration overwritten by oVirt default
> #polling_interval10
> #
> path_selector   "round-robin 0"
> path_grouping_policymultibus
> path_checkertur
> rr_min_io_rq10
> rr_weight   priorities
> failbackimmediate
> features"0"
> }
> }
>
> After activating this config I have this mutipath layout
>
> [root@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@ov300 etc]#
>
> NOTE: at 

[ovirt-users] iscsi config for dell ps series

[Gianluca Cecchi]

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_interval5
no_path_retry   fail
user_friendly_names no
flush_on_last_del   yes
fast_io_fail_tmo5
dev_loss_tmo30
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_devsyes
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@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@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_interval10
path_selector   "round-robin 0"
path_grouping_policymultibus
path_checkertur
rr_min_io_rq10
max_fds 8192
rr_weight   priorities
failbackimmediate
features0
}

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_interval5
no_path_retry   fail
user_friendly_names no
flush_on_last_del   yes
fast_io_fail_tmo5
dev_loss_tmo30
#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_devsyes
no_path_retry   fail
}
device {
vendor  "EQLOGIC"
product "100E-00"
#Default EQL configuration overwritten by oVirt default
#polling_interval10
#
path_selector   "round-robin 0"
path_grouping_policymultibus
path_checkertur
rr_min_io_rq10
rr_weight   priorities
failbackimmediate
features"0"
}
}

After activating this config I have this mutipath layout

[root@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@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@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@ov300 ~]#

[root@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: