[CentOS] Odd behavior of a CentOS 7 box after repair of an external RAID

[Valeri Galtsev]

On Fri, March 25, 2016 9:55 am, m.roth at 5-cent.us wrote:
> I don't think I've seen this with CentOS 6 or 5, but I had to repair an
> external RAID box this morning. The server, running CentOS 7, has an  LSI
> HBA card in it, and it's presented to the system as /dev/sdb. I shut off
> the RAID controller, powered it off,

You did unmount filesystem on the machine before that, right?

> did the repair, then plugged
> everything back in (that includes the two fiber cables and the ethernet),
> and brought the RAID back up. I even used its web page to restart the
> controller (in the RAID box.
>
> I couldn't remount the drive until I rebooted the server.

Before powering off/disconnecting RAID box, did you remove resembling SCSI
device? this is done if my memory doesn't fail me by doing this:

echo 1 > /sys/class/scsi_device/6:0:0:0/device/delete

(replace "6:0:0:0" with your device's address). If you didn't remove the
device before powering it off, I'm not surprised. If you did remove the
device before powering it off, I'm puzzled ;-)

Valeri

>
> I tried scsi-rescan-bus, and nothing. In the logs, I saw it try to mount
> it, then unmount it, and complain that the drive wasn't active.
>
> I was expecting it to act like a hot-swap device. Any clues as to why,
> rather than see it removed, it continued to see it as "inactive"?
>
>        mark
>
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
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