[lustre-discuss] MDS using D3710 DAS

Sid Young sid.young at gmail.com
Sun Feb 14 14:42:43 PST 2021

Hi Christopher,

Just some background, all servers are DL385's all servers are running the
same image of Centos 7.9, The MDS HA pair have a SAS connected D3710 and
the dual OSS HA pair have a D8000 each with 45 disks in each of them.

The D3710 (which has 24x 960G SSD's) seams a bit hit and miss at presenting
two LV's, I had setup a /lustre and /home which I was going to use ldiskfs
rather than zfs however I am finding that the disks MAY present to both
servers after some reboots but usually the first server to reboot see's the
LV presented and the other only see's its local internal disks only, so the
array appears to only present the LV's to one host most of the time.

With the 4 OSS servers. i see the same issue, sometimes the LV's present
and sometimes they don't.

I was planning on setting up the OST's as ldiskfs as well, but I could also
go zfs, my test bed system and my current HPC uses ldsikfs.

Correct me if I am wrong, but disks should present to both servers all the
time and using PCS I should be able to mount up a /lustre and /home one the
first server while the disks present on the second server but no software
is mounting them so there should be no issues?

Sid Young

On Fri, Feb 12, 2021 at 7:27 PM Christopher Mountford <cjm14 at leicester.ac.uk>

> Hi Sid,
> We've a similar hardware configuration - 2 MDS pairs and 1 OSS pair which
> each consist of 2 DL360 connected to a single D3700. However we are using
> Lustre on ZFS with each array split into 2 or 4 zpools (depending on the
> usage) and haven't seen any problems of this sort. Are you using ldiskfs?
> - Chris
> On Fri, Feb 12, 2021 at 03:14:58PM +1000, Sid Young wrote:
> >    G'day all,
> >    Is anyone using a HPe D3710 with two HPeDL380/385 servers in a MDS HA
> >    Configuration? If so, is your D3710 presenting LV's to both servers at
> >    the same time AND are you using PCS with the Lustre PCS Resources?
> >    I've just received new kit and cannot get disk to present to the MDS
> >    servers at the same time..... :(
> >    Sid Young
> > _______________________________________________
> > lustre-discuss mailing list
> > lustre-discuss at lists.lustre.org
> > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
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