Gentoo Archives: gentoo-user

From: "J. Roeleveld" <joost@××××××××.org>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] multipath.conf : learning how to use
Date: Wed, 14 Aug 2019 11:21:25
Message-Id: 1786455.n5vAsDlxU6@andromeda
In Reply to: Re: [gentoo-user] multipath.conf : learning how to use by "Stefan G. Weichinger"
On woensdag 14 augustus 2019 10:14:31 CEST Stefan G. Weichinger wrote:
> Am 14.08.19 um 08:36 schrieb J. Roeleveld: > > Stefan, > > > > On maandag 29 juli 2019 21:28:50 CEST Stefan G. Weichinger wrote: > >> At a customer I have to check through an older gentoo server. > >> > >> The former admin is not available anymore and among other things I have > >> to check how the SAN storage is attached. > > > > If you ever encounter that admin, make sure you hide the body :) > > I only learn day by day what a mess all that is ...
If there is no documentation, it is a mess by definition.
> >> I see two devices sdc and sdd that should come from the SAN. > > > > Interesting, are these supposed to be the same? > > No, I don't think so. But maybe you'r right. No sdd in fstab or in the > mounts at all and ...
See next item, make sure you do NOT mount both at the same time.
> > what do you get back from: > > > > # /usr/bin/sg_vpd --page=di /dev/sdc > > # /usr/bin/sg_vpd --page=di /dev/sdd > > (As suggested in the multipathd.conf file you listed above) > > these 2 look similar to me: > > samba ~ # /usr/bin/sg_vpd --page=di /dev/sdc > Device Identification VPD page: > Addressed logical unit: > designator type: NAA, code set: Binary > 0x600c0ff0001e91b2c1bae25601000000
> samba ~ # /usr/bin/sg_vpd --page=di /dev/sdd > Device Identification VPD page: > Addressed logical unit: > designator type: NAA, code set: Binary > 0x600c0ff0001e91b2c1bae25601000000
> > > If "sdc" and "sdd" are the same disk, the "Adressed logical unit" id > > should be the same for both. > > So we have 0x600c0ff0001e91b2c1bae25601000000 twice, right?
Yes, IOW, the same device/LUN/whatever. Do NOT mount both at the same time EVER
> There's a /dev/sdb as well, commented in fstab with "9750-8i Raid6 > (4x3TB + 2x4TB)" but that seems another "branch" of devices: > > # /usr/bin/sg_vpd --page=di /dev/sdb > Device Identification VPD page: > Addressed logical unit: > designator type: NAA, code set: Binary > 0x600605b00d0ce810217ccffe19f851e8
Yes, this one is different. I checked the above ID and it looks like it is already correctly configured. Is " multipathd " actually running? If it were running correctly, you would mount " /dev/mapper/.... " instead of " /dev/sdc " or " /dev/sdd ".
> In the first week of september I travel there and I have the job to > reinstall that server using Debian Linux (yes, gentoo-users, I am > getting OT here ;-)).
For something that doesn't get updated/managed often, Gentoo might not be the best choice, I agree. I would prefer Centos for this one though, as there is far more info on multipath from Redhat.

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Re: [gentoo-user] multipath.conf : learning how to use "Stefan G. Weichinger" <lists@×××××.at>