Re: [lustre-discuss] Wanted: multipath.conf for dell ME4 series arrays
Hi Jeff,
On Wed, 21 Aug 2019 at 17:34, Jeff Johnson
wrote:
> What underlying Lustre target filesystem? (assuming ldiskfs with a hardware
> RAID array)
correct - ldiskfs, using 8* raid6 luns per ME4084
> What does your current multipath.conf look like?
we just had blacklist, WWNs and mappings, we were missing any ME4
specific device {} settings, however I've since found the magic
incantation from
https://downloads.dell.com/manuals/common/powervault-me4-series-linux-dell-emc-2018-3924-bp-l_wp_en-us.pdf,
notably
device {
vendor "DellEMC"
product "ME4"
path_grouping_policy "group_by_prio"
path_checker "tur"
hardware_handler "1 alua"
prio "alua"
failback immediate
rr_weight "uniform"
path_selector "service-time 0"
}
and it seems to be working a whole lot better :-)
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Re: [lustre-discuss] Wanted: multipath.conf for dell ME4 series arrays
Andrew,
ME4084 is a dual-controller active/active hardware RAID array. Disclosing
some config data could be helpful.
1. What underlying Lustre target filesystem? (assuming ldiskfs with a
hardware RAID array)
2. What does your current multipath.conf look like?
--Jeff
On Tue, Aug 20, 2019 at 11:47 PM Andrew Elwell
wrote:
> Hi folks,
>
> we're seeing MMP reluctance to hand over the (umounted) OSTs to the
> partner pair on our shiny new ME4084 arrays,
>
> Does anyone have the device {} settings they'd be willing to share?
> My gut feel is we've not defined path failover properly and some
> timeouts need tweaking
>
>
> (4* ME4084's per 2 740 servers with SAS cabling, Lustre 2.10.8 and CentOS
> 7.x)
>
> Many thanks
>
>
> Andrew
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--
--
Jeff Johnson
Co-Founder
Aeon Computing
jeff.johnson at aeoncomputing dot com
www.aeoncomputing.com
4170 Morena Boulevard, Suite C - San Diego, CA 92117
High-Performance Computing / Lustre Filesystems / Scale-out Storage
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[lustre-discuss] Wanted: multipath.conf for dell ME4 series arrays
Hi folks,
we're seeing MMP reluctance to hand over the (umounted) OSTs to the
partner pair on our shiny new ME4084 arrays,
Does anyone have the device {} settings they'd be willing to share?
My gut feel is we've not defined path failover properly and some
timeouts need tweaking
(4* ME4084's per 2 740 servers with SAS cabling, Lustre 2.10.8 and CentOS 7.x)
Many thanks
Andrew
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