[tech] New Mermaid

Sat Mar 5 00:06:16 WST 2011

On Fri, 4 Mar 2011, Mitch Kelly (UCC) wrote:

> Drives have been replaced with the help of Chris, Bob and TRS.
> 
> TRS is adding new disks into the array.... i think...

Yep, they were initially unable to be added:

# mdadm /dev/md1 --add /dev/sdj1
mdadm: Cannot open /dev/sdj1: Device or resource busy

This is because multipath snarfed them:

# multipath -l
360060160879a1000d8c0be44a3cfdf11 dm-1 DGC,RAID 10
size=1.2T features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=-1 status=active
| `- 5:0:0:0 sda 8:0   active undef running
`-+- policy='round-robin 0' prio=-1 status=enabled
  `- 5:0:1:0 sdc 8:32  active undef running
SSEAGATE ST3146707LC    3KS1TK41 dm-4 SEAGATE,ST3146707LC
size=137G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=-1 status=active
  `- 7:0:0:0 sdj 8:144 active undef running      
360060160879a1000ceacdb257c02e011 dm-2 DGC,RAID 1
size=50G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=-1 status=active
| `- 5:0:0:1 sdb 8:16  active undef running
`-+- policy='round-robin 0' prio=-1 status=enabled
  `- 5:0:1:1 sdd 8:48  active undef running
SSEAGATE ST3146807LC    3HY9BZG2 dm-3 SEAGATE,ST3146807LC
size=137G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=-1 status=active
  `- 7:0:3:0 sdg 8:96  active undef running

The trick is to remove them with dmsetup:

# dmsetup remove /dev/mapper/SSEAGATE\ ST3146707LC\ \ \ \ 3KS1TK41
# dmsetup remove /dev/mapper/SSEAGATE\ ST3146807LC\ \ \ \ 3HY9BZG2

Then the raw disk devices could be added back to the RAID array.

> -----Original Message-----
> From: Mitch Kelly (UCC) [mailto:mitch at ucc.asn.au] 
> Sent: Friday, 4 March 2011 9:01 PM
> To: 'Mitch Kelly (UCC)'; 'Bob Adamson'
> Cc: tech at ucc.gu.uwa.edu.au
> Subject: RE: [tech] New Mermaid
> 
> These drives will be replaced tonight instead of this weekend.
> 
> -----Original Message-----
> From: tech-bounces at ucc.gu.uwa.edu.au [mailto:tech-bounces at ucc.gu.uwa.edu.au]
> On Behalf Of Mitch Kelly (UCC)
> Sent: Friday, 4 March 2011 7:53 PM
> To: 'Bob Adamson'
> Cc: tech at ucc.gu.uwa.edu.au
> Subject: Re: [tech] New Mermaid
> 
> Fine,
> 
> I retract that offer.
> 
> -----Original Message-----
> From: Bob Adamson [mailto:bob at ucc.gu.uwa.edu.au] 
> Sent: Friday, 4 March 2011 2:16 PM
> To: Mitch Kelly (UCC)
> Cc: tech at ucc.gu.uwa.edu.au
> Subject: RE: [tech] New Mermaid
> 
> Mitch,
> 
> You have completely failed to deliver on every single item you have 
> offered to sell or donate to the club since July last year. Mylah is 
> currently one disk away from raid failure as a result of this. Forgive me 
> if I don't hold my breath for your current offer.
> 
> Bob
> 
> On Fri, 4 Mar 2011, Mitch Kelly (UCC) wrote:
> 
> > I can drop off one of my spare Mini ITX Via Eden boards.
> > I will be at UCC likely Sunday or Monday with the replacement 146's and a
> > label maker.
> > 
> > The ITX board takes up to 2GB Ram and doesn't require a fan, we COULD mount
> > it inside the coke machine...
> > 
> > 
> > Mitch
> > 
> > -----Original Message-----
> > From: tech-bounces at ucc.gu.uwa.edu.au
> [mailto:tech-bounces at ucc.gu.uwa.edu.au]
> > On Behalf Of Bob Adamson
> > Sent: Thursday, 3 March 2011 10:53 PM
> > To: tech at ucc.gu.uwa.edu.au
> > Subject: [tech] New Mermaid
> > 
> > Hi techies,
> > 
> > I've been thinking about a replacement box for mermaid, and now seems like
> 
> > a good time to do the job properly while the box isn't being used for 
> > anything.
> > 
> > Dispense is currently running on heathred, the vendserver is running on 
> > martello, the door lock is controlled by a service running on mussel, with
> 
> > a decserver, a man-eating power supply and a modem in amongst all that. 
> > It's all very hot, very power hungry, and not all that reliable. What I 
> > hope to do is put all these services on one reliable machine with a ups. 
> > It will also require a little electronics later on for the door stuff. 
> > This will hopefully mean that the services are more likely to stay up in 
> > emergencies (fuse trips, power dips, hail storms in the clubroom, 
> > armageddon, freshers in the machine room) and also be easier to 
> > understand, manage and update.
> > 
> > The replacement box should run on as little power as possible, have at 
> > least 3 serial ports (preferably more), have static cooling (ie no fans), 
> > preferably mini or microATX so we can stick it somewhere out of the way.
> > 
> > At the moment, I'm keen on getting something in the $800 range from 
> > advantech, such as 
> > http://buy.advantech.net.au/ARK-3360L-3S51/ARK-3360L-3S51/system-3545.htm 
> > 
> > If you have a better suggestion, or can be bothered trawling sites to 
> > custom build a box, I'd love to hear from you!

-- 
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