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Anonymous_User Absent Member.
Absent Member.
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replace failed mirrored drive (software mirror)

Hello to everyone.....

This is my first experience with software mirroring and a failed drive with
Netware. I have a Netware 6 server with 4 18.2gb hard drives. There is no
raid controller just a scsi card. There are two pools each with one volume,
and each pool is mirrored to one of the other hard drives. This server was
built years before I started working with the company needless to say. The
error message flashes on the console that not all mirrored objects are
synchronized. The HP management log reports that one of the hard drives has
failed, I know which one it is and I have a replacement. I also know which
pool had a mirrored partition on the failed drive. In NSSMU the device is
still listed but it shows no partitions. The server has not been rebooted
since the drive failed. Both pools and volumes are available and working
fine.

So what process am I looking at here? I am hoping all I have to do is down
the server, replace the drive and then boot back up, initialize the drive,
and tell NSS to mirror the partition again? Do I need to first break the
existing mirror? I am nervous about deleting the wrong thing and nuking the
data. Thanks for your help..........


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5 Replies
Knowledge Partner
Knowledge Partner

Re: replace failed mirrored drive (software mirror)

Hi,

Jacob Shorr wrote:
>
> So what process am I looking at here? I am hoping all I have to do is down
> the server, replace the drive and then boot back up, initialize the drive,
> and tell NSS to mirror the partition again?


That's basically it, yes.

> Do I need to first break the
> existing mirror?


Not necessarily, but it would make sense. You could in theory do it
later though, and first add the new drive to the mirror.

> I am nervous about deleting the wrong thing and nuking the
> data.


Shouldn't happen, once the original mirror drive is really dead and
gone. In NSSMU, under Raiddevices, navigate to the individual segments.
The dead one will cleraly indicate it's missing, the running one shows
"on-line". Delete the other one, then add the new drive.

CU,
--
Massimo Rosen
Novell Product Support Forum Sysop
No emails please!
http://www.cfc-it.de
CU,
--
Massimo Rosen
Micro Focus Knowledge Partner
No emails please!
http://www.cfc-it.de
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Anonymous_User Absent Member.
Absent Member.

Re: replace failed mirrored drive (software mirror)

Thank you for the pointers. I am assuming it does not fully indicate that
it is missing since the server has never been restarted and it's not a
hot-plug system. I should be all set to go tomorrow, thanks again.
"Massimo Rosen" <mrosenno@spamcfc-it.de> wrote in message
news:47AF83A7.BE724C82@spamcfc-it.de...
> Hi,
>
> Jacob Shorr wrote:
>>
>> So what process am I looking at here? I am hoping all I have to do is
>> down
>> the server, replace the drive and then boot back up, initialize the
>> drive,
>> and tell NSS to mirror the partition again?

>
> That's basically it, yes.
>
>> Do I need to first break the
>> existing mirror?

>
> Not necessarily, but it would make sense. You could in theory do it
> later though, and first add the new drive to the mirror.
>
>> I am nervous about deleting the wrong thing and nuking the
>> data.

>
> Shouldn't happen, once the original mirror drive is really dead and
> gone. In NSSMU, under Raiddevices, navigate to the individual segments.
> The dead one will cleraly indicate it's missing, the running one shows
> "on-line". Delete the other one, then add the new drive.
>
> CU,
> --
> Massimo Rosen
> Novell Product Support Forum Sysop
> No emails please!
> http://www.cfc-it.de



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snidelydev Absent Member.
Absent Member.

Re: replace failed mirrored drive (software mirror)

jshorr;1464911 wrote:
Thank you for the pointers. I am assuming it does not fully indicate that
it is missing since the server has never been restarted and it's not a
hot-plug system. I should be all set to go tomorrow, thanks again.


I've rarely had a mirrored drive fail as in bad hardware -- I yank cables, pull drives, etc -- so I'm not sure what NSSMU will say about the partition in the raid screen, but since the partition screen says "nobody home", I'm sure that the mirroring code has already figured out that the drive has gone bye-bye.

Here's one of my old writeup -- I'm posting kinda quick, but I think I've got the portion you need (this writeup was usually customized to fit people moving data via mirroring).

When you want to remove the old device:

1) as always, have a working backup [e.g., on tape].

2) Pull the bad disk out of the system.
[since this is a SAN device, you can probably do this with the system up by pulling a cable
or by setting it "offline" in the array manager]
2) Pull the bad disk out of the system
[for internal drives, you'd shutdown first, and reboot afterwards]

3) load NSSMU

4) Select DEVICES

5) Press F2 to scan devices

6) return to the main NSSMU menu

7) Select RAID devices

😎 Select the RAID (mirror) set of interest

9) Select the "offline" partition

10) Press the DELETE key

11) You now have a "complete" mirror, even if it only has 1 partition in it.


Good luck!

/dps

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snidelydev Absent Member.
Absent Member.

Re: replace failed mirrored drive (software mirror)

snidelydev;1465953 wrote:
I
2) Pull the bad disk out of the system.
[since this is a SAN device, you can probably do this with the system up by pulling a cable
or by setting it "offline" in the array manager]
2) Pull the bad disk out of the system
[for internal drives, you'd shutdown first, and reboot afterwards]


I think you can guess which number 2 you're supposed to use ;-} I said I was posting quick, didn't I?

With Massimo's advice, you should be good to go!

/dps

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snidelydev Absent Member.
Absent Member.

Re: replace failed mirrored drive (software mirror)

Ooops, that's just the cleanup part.

For the rebuild, the other half of my ancient stuff should be used:

1) as always, have a working backup [e.g., on tape].

2) Go about installing the new disk [For internal drives, shutdown first and reboot afterwards]

3) load NSSMU

4) Select DEVICES, and scroll down to the new device.

5) Press F3 to initialize it

6) return to top level menu and select RAID devices

7) select the partition of interest

😎 Press F3 to expand the mirror

9) Select the new device from the popup list.

10) Press F5 occasionally if you want to see the mirror percentage update, otherwise exit.


Good luck!

/dps

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