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Mirrored drive replacement

By mike.peck ·
Recently, one of my servers (NW 3.20) two 18 gb mirrored (not duplexed) SCSI drives crashed. I determined which drive had crashed, removed it, rebooted and everything seems to be OK. I have ordered a replacement drive. NOTE: The server boots fromthe SCSI drive, no an IDE drive. The problem is that I have never had to replace a mirrored drive. Some guidance would be appreciated. Do I format the drive? If so, do I use NEtware or DOS? Do I create a DOS partition on the new drive? Do I install DOS on the new drive?
Thank you,
Mike Peck

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Mirrored drive replacement

by Kevin Anderson In reply to Mirrored drive replacemen ...

If the dead drive is a mate to the one you boot from, use fdisk, and make a dos partition the same size as your current dos partition. This is often forgotten. Then use xcopy to copy your DOS files over as a backup. There is no Registry, or anything fancy, so Xcopy works great.

Then boot up netware. Load Install, and in Disk Options, Choose Mirror/Unmirror Disk Partitions. If you see an incomplete set, where one device ID is shown as a question mark, select that set, and break it by removing the ? drive from the set. If not, then you must have broken them correctly before removing the old one. Next, you'll want to go to Modify disk partitions and hot fix of the WORKING drive, and check what size the Netware Partition is. DON"T CHANGE IT. (You actually can't change it if the volumes are mounted.) Once you know the size, skip out, and go to the new drive. Create a Netware Partition the same size as in the other drive. once that's done skip back into Mirror/unmirror. Choose your CURRENT GOOD

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Mirrored drive replacement

by mike.peck In reply to Mirrored drive replacemen ...

The question was auto-closed by TechRepublic

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Mirrored drive replacement

by Kevin Anderson In reply to Mirrored drive replacemen ...

Continuing...

Choose your CURRENT GOOD WORKING drive. (This is important, be sure you have the right one) then hit Insert to add another drive. Select the new drive, and it should mirror right up. If you get an error that the partition sizes are different, it's OK if Netware expands the partition on the NEW drive, but it is NOT ok for netware to expand the old partition (You'll get errors). Sometimes the partition size will get rounded off and ends up a bit different that the number you specified...

Before you start, you'll want the make sure the new drive's SCSI ID is the same as the ID on the drive you were replacing. It can be any free ID, but the same as the old drive is generally easiest to figure out.

Kev.

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Mirrored drive replacement

by mike.peck In reply to Mirrored drive replacemen ...

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Mirrored drive replacement

by admin In reply to Mirrored drive replacemen ...

the best way typically, would be to physically install the new drive without any partitions. Launch the server and create a netware partition on the new disk #1 (assuming scsi-id is 1) to match your disk #0 (assuming your boot disk is SCSI-ID 0) and re-mirror your volumes. If there are any differences in partition size, the mirror process will ask if you want them synchronized, select yes.
Once mirroring is done, then you can down the server and create your dos partition on remaining free space on disk #1, format it, sys it, and xcopy everything from the dos partition on disk #0 to the dos partition on disk #1.
Note* you can use the ghost program to "clone" the dos partitions.
Note* If you make any changes to the dos partition ondisk #0 later, like install patches, etc., remember to copy them to dos partition on disk #1 also.

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Mirrored drive replacement

by mike.peck In reply to Mirrored drive replacemen ...

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Mirrored drive replacement

by Brian M In reply to Mirrored drive replacemen ...

The first 2 answers are fine if the mirroring was done through Netware. However, if your system is using hardware mirroring (where the mirror is set up by the SCSI card), then the remirror needs to be done using the utility that came with the card. Since you have 18GB drives, I suspect there is a good chance that you are using hardware mirroring. Systems from Compaq, Dell, HP, IBM, etc., usually come with SCSI RAID controller cards.

Brian

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Mirrored drive replacement

by mike.peck In reply to Mirrored drive replacemen ...

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Mirrored drive replacement

by lloyd In reply to Mirrored drive replacemen ...

Take out the bad drive. Set the good drive to be the primary SCSI. If it was the SCSI 0 drive then change the jumper setting(take it off). Boot up on what was the secondary SCSI drive which now becomes the primary bootable. Add a second unformatted drive and put the jumper on so the SCSI card recognizes it as the next SCSI in the chain.

If it is the secondary SCSI drive just take it out and replace with a new unformatted drive.

Now just follow the instructions to remirror the drive, using the features in the install menu.

DONE

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Mirrored drive replacement

by mike.peck In reply to Mirrored drive replacemen ...

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