Quantum Lattus S20 User manual

Replacing Decommissioned Disks
in a Lattus Storage Node
Each Lattus Storage Node contains the following customer replaceable units (CRUs):
l12 hard disk drives
l2 power supplies
The instructions in this document describe how to replace decommissioned hard disk drives in a Lattus
storage node.
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6-68540-02 Rev A, March 2017

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Lattus Replace Decommissioned Disks 2
Locating Lattus Storage Nodes
When you're ready to replace CRUs in your Lattus Storage Nodes, you can physically locate the storage
nodes in your data center by doing the following in the Lattus CMC to illuminate the nodes' Location LEDs:
1. Determine which Lattus Storage Node contains the failed CRU.
a. If a power supply has failed, the Live Events section of the Dashboard lists the name of the node
containing the failed power supply the Node column.
b. If you have decommissioned drives that need to be replaced, navigate to Dashboard >
Administration > Hardware > Disks > Decommissioned. The names of the nodes with
decommissioned disks are listed in the Machine column.
2. Navigate to the Storage Nodes:[storage node name] screen.
a. If you're trying to locate a Lattus Storage Node that contains decommissioned disks, just click the
name of the node in the Decommissioned Disks screen's Machine column.
b. If you need to turn on the Location LED for a Lattus Storage Node that contains a failed power
supply, select Dashboard > Administration > Hardware > Servers > Storage Nodes to
access the Storage Nodes screen, then click the Lattus Storage Node you would like to locate.
3. In the Commands pane of the Storage Node: [storage node name] screen, select the Location
LED On radio button. This illuminates the Lattus Storage Node's Location LED. After replacing CRUs,

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Lattus Replace Decommissioned Disks 3
turn off the Location LED by selecting the Location LED OFF radio button.
4. You can now locate the selected Lattus S10 or original S20 Storage Node at the data center by its
illuminated Location LED.
For Lattus S20 Model 2, S30 or S50 storage nodes, the Location LED is located on the left side of the front
panel.
The S20 Model 2, S30 and S50 also have a Location LED located on the rear of the node near the
VGA port. When you press the Location button, the blue LED illuminates.

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Getting Started
Replacements for your decommissioned disks are shipped to you when required.
Replacing disks in a storage node involves these steps:
lExporting the Decommissioned Disk Details on the next page
lShutting Down the Lattus Storage Node on page 7
lRemoving the Lattus Storage Node from the Rack on page 7
lReplacing Disks in the Lattus S10 or S20 on page 9
lReplacing Disks in the Lattus S20 Model 2, S30 or S50 on page 11
lReinstalling a Lattus Storage Node in a Rack on page 14
lBooting the Lattus Storage Node on page 14
lRepurposing a Disk on page 15
lWhat to Do When You're Finished Replacing Disks in the Lattus Storage Node on page 16
WARNING: Opening or removing the Lattus Storage Node cover while it is powered on may expose
you to a risk of electric shock.
Caution: When replacing items from the inside of the chassis, ensure that you take precautions to
prevent Electrostatic Discharge (ESD).
Note: Unless otherwise specified, the procedures in this section apply to all Lattus storage nodes (S10,
Lattus S20, Lattus S20 Model 2, S30 and Lattus S50).
Caution: If you need to replace disks in multiple storage nodes, shut down and replace the disks one
node at a time. If you shut down too many storage nodes at once, data unavailability may occur.
Be especially careful when replacing storage nodes disks in systems that have a small number of
storage nodes, such as a 6-node system.
If the spread width is larger than the number of storage nodes, turning off one or more storage nodes
can have a serious impact on Lattus availability. The moment the actual disk safety becomes negative,
your Lattus installation is no longer accessible.
Follow these guidelines if you must replace disks in an environment with a small number of storage
nodes:
1. Turn off only one node at a time.
2. Replace the disk(s).

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Lattus Replace Decommissioned Disks 5
3. Switch on the node.
4. When the node is fully operational, wait at least five minutes before turning off the next node.
Prerequisites
lA Philips screwdriver.
lA number of new storage disks equal to the number of disks that need to be replaced.
The new disk must meet the following properties:
lThe spare disk has to be clean (no partitions)
lThe disk size of the new disk has to be the same or higher than the original one.
Note: To see an overview of how to replace a decommissioned disk in an S10/S20 Storage Node,
review the video "Lattus: Replacing Decommissioned Disks in an S10/S20 Storage Node” by
clicking here to access the Lattus Documentation Center, and then select Learn > Videos >
Lattus CRU Hardware Replacement Videos.
Exporting the Decommissioned Disk Details
To properly identify decommissioned disks within a Lattus Storage Node, you must print the details for the
decommissioned disks from the Lattus CMC:
1. Navigate to Dashboard > Administration > Hardware > Disks > Decommissioned.
2. In the Decommissioned Disks screen, select the check boxes next to the decommissioned disks.
3. In the Commands pane, click one of the following:
a. Export details as PDF: A PDF with all the necessary details is generated.
Note: This feature is currently disabled and will be enabled again in a future Lattus release. In
the meantime, use the emailed pdf method described below.
b. Mail details: specify an email address. A generated PDF with the necessary details is sent to that

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Lattus Replace Decommissioned Disks 6
email.
Note: To use this “Mail details” option, an smtp server must be configured. This is typically
configured when the management controller node is initialized. For more information about
configuring the smtp server, refer to “Finalizing the Cloud Service Setup” in the Lattus Installation
and Configuration Guide.
4. Once you've determined which Lattus Storage Node contains the decommissioned disks that need to
be replaced, turn on its Location LED by following these steps:
a. select Dashboard > Administration > Hardware > Servers > Storage Nodes to access the
Storage Nodes screen.
b. Click the Lattus Storage Node you want to locate.
c. In Commands pane of the Storage Node: [storage node name] screen, click the Location LED
On radio button. This will illuminate the Lattus Storage Node's Location LED.

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Lattus Replace Decommissioned Disks 7
Note: After replacing the failed component, turn off the Location LED by clicking the Location
LED OFF radio button.
d. You can now physically locate the selected Lattus Storage Node at the data center by finding the
storage node whose Location LED is illuminated.
Shutting Down the Lattus Storage Node
Before replacing disks inside a Lattus Storage Node, you must shut down the node that requires disk
replacement (as identified in the previous step).
If you need to replace disks in multiple storage nodes, follow the steps below for shutting down and replacing
the disks one node at a time.
Caution: Do not shut down more than one Lattus Storage Node at a time. If you shut down too many
storage nodes at once, data unavailability may occur.
1. In the Lattus CMC, navigate to Dashboard > Administration > Hardware > Servers > Storage
Nodes.
2. When the list of storage nodes appears, select the node you want to shut down. After you do so, several
command options appear on the right side of the screen.
3. When the list of storage nodes appears, select the node you want to shut down. After you do so, several
command options appear on the right side of the screen.
Removing the Lattus Storage Node from the Rack
To replace the disks in a Lattus Storage Node, you must remove it from the rack completely. To remove it
from the rack, follow these steps:
1. Once the Lattus Storage Node has been successfully shut down, go to the data center and locate the
Lattus Storage Node that contains disks that need to be replaced (look for the illuminated Location
LED).

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Figure 1: Location LEDs on a Lattus S10 or S20
Figure 2: Location LEDs on a Lattus S20 Model 2, S30 or S50
2. Detach the safety on the power cables and unplug them from the Lattus Storage Node's power
supplies.
Note: If they are not labeled already, mark the power cables to differentiate between the two to
ensure that you reconnect the power cables to the correct power supplies when you reinstall the
Lattus Storage Node.
3. Disconnect the network cables from the Lattus Storage Node's network ports.
Note: If labels or different colored network cables were not used to identify the network cables,
mark them before unplugging them so you can differentiate between them when you reconnect
them later.
The example below shows how the network cables for a Lattus S10/S20 might be labeled to
identify which one connects to Eth0, and which one connects to Eth1. This ensures that the ports
on the Lattus Storage Node are reconnected to the correct ports on the Lattus Rack Switches.
4. Unscrew the two front screws.
5. Slowly slide the Lattus Storage Node out until you reach the pull-safety (you will hear a soft clicking
sound).

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6. Push the pull-safety on both sides of the Lattus Storage Node, and slide the node out until you see the
split line between the two top covers.
7. Remove the Lattus Storage Node from the rack completely.
Caution: Once you pull the node past the pull-safety, don't leave the node in the rack. Otherwise
the rack rails might break.
8. Unscrew the four screws from the Lattus Storage Node's top plate and carefully slide it off.
Replacing Disks in the Lattus S10 or S20
Once you have removed the Lattus Storage Node from the rack, follow these steps to replace the
decommissioned disk(s) in a Lattus S10 or S20.
Note: If you are replacing disks in a Lattus S20 Model 2, S30 or S50, see Replacing Disks in the Lattus
S20 Model 2, S30 or S50 on page 11
1. Using the decommissioned disk details report you exported from the Lattus CMC, identify the disks that
need to be replaced.
Note: The report shown in the illustration shows a disk drive with a 3.00 TB capacity. Lattus also
uses disk drives with 4.00 TB and 6.00 capacity. Be sure to obtain the correct capacity drive for
replacement.
All disk drives in a Lattus Storage Node must be the same capacity, meaning either all 3 TB drives,
all 4TB drives, or all 6 TB drives. Mixing 3 TB, 4 TB drives and 6 TB drives in the same storage
node is not currently supported.
Caution: Always check and confirm the serial numbers of the disks to verify that you're replacing
the right ones.
Caution: Be sure the storage capacity of the replacement drive(s) matches the drive(s) you are
replacing. For example, do not install a 4 TB or 6 TB replacement drive into a Lattus S10 Storage
Node, and do not install a 3 TB or 6 TB replacement drive into a Lattus S20 Storage Node.

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Lattus Replace Decommissioned Disks 10
2. Unscrew the disk from the Lattus Storage Node and slide it out by pulling the handle towards the front
of the storage node. Do not pull upwards on the handle.
3. Remove the disk from its drive sled by unscrewing the screw holding the drive to the sled.
4. Screw the new disk into the drive sled and place it into the Lattus Storage Node.
Note: There are four posts that must be inserted into the four holes on the bottom of the drive sled
when you install the drive into the storage node. The drive will not sit flush in the storage node
unless all four posts are inserted with the four holes.
The following illustration shows the four posts that must be inserted into the four holes on the bottom of
the drive sled.
5. Repeat steps 2 through 5 for each disk that must be replaced.
6. When all of the decommissioned disks have been replaced, slide the top plate back on the Lattus
Storage Node and screw it back onto the node tightly.

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Replacing Disks in the Lattus S20 Model 2, S30 or S50
Once you have removed the Lattus Storage Node from the rack, follow these steps to replace the
decommissioned disk(s) in a Lattus S20 Model 2, S30 or S50.
1. Unscrew the cover thumbscrews from the Lattus Storage Node's top.
2. Using the decommissioned disk details report you exported or emailed from the Lattus CMC, identify
the disks that need to be replaced.
Caution: Always check and confirm the serial numbers of the disks to verify that you're replacing
the right ones.
Caution: If your Lattus system includes a mix of different Lattus Storage Node models and you
are replacing drives in multiple storage nodes, be sure the storage capacity of the replacement
drive(s) matches the drive(s) you are replacing.
For example, do not install a 3 TB, 6 TB or 10 TB replacement drive into a Lattus S20 Model 2 Storage
Node. Also do not install a 3 TB,4 TB or 10 TB replacement drive into a Lattus S30, and do not install a
3 TB, 4 TB or 6 TB replacement drive into a Lattus S50 Storage Node.
Also, different 4 TB drives are used in the original Lattus S20 and the S20 Model 2, so make sure you
are using the correct replacement drives in those nodes.
3. Pull the lid toward the front of the node to unseat and remove the cover.
4. Identify the location of the drive you want to replace. The following illustration shows how the twelve
drives are arranged inside the chassis. Make a note of the drive number because you will need it when

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Lattus Replace Decommissioned Disks 12
you disconnect the drive connector cable.
5. Disconnect the SATA power and signal cables from the failed hard drive. To help you identify the
correct drive cable, the cable is numbered both where it connects to the drive and where it connects to
the drive controller.

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Lattus Replace Decommissioned Disks 13
The following illustration shows which cable to disconnect from the hard drive.

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Lattus Replace Decommissioned Disks 14
6. Lift up the failed hard drive and remove it from the chassis.
Note: The drive can be removed by simply lifting it from the chassis. There are no screws to loosen
or remove.
7. Insert the replacement drive into the vacated HDD space.
Note: The new drive should rest on the protective foam pieces. There are no screws to tighten.
8. Reconnect the SATA power and signal cables.
9. Replace the storage node’s top cover and tighten the thumbscrews.
Reinstalling a Lattus Storage Node in a Rack
1. Safely reinstall the Lattus Storage Node back into its position in the rack and slide the node all the way
into the rack.
Caution: Do not leave the Lattus Storage Node partially installed in the rack. Slide it all the way
into the rack. Otherwise the rack rails might break.
2. Tighten the two front screws.
3. Reconnect the network cables to the ports from which you disconnected them.
4. Reconnect the power cables to the power supplies from which you removed them, and attach the
safety.
Booting the Lattus Storage Node
1. Push the power button on the front of the Lattus Storage Node to boot it.
2. Check if the node has successfully booted and if the disks have been initialized by doing the following:
a. Look in the Events section of the Dashboard. When the machine has booted, you will see the two
events listed below:
lMachinewasrebooted
lNewemptydisk(s)detected.This event may take up to 15 minutes to appear in the Events
list. If you insert a disk that does have data on it, you will see the “New non-empty disk(s)
detected” event.
b. After the second event appears, go to Dashboard > Administration > Lattus Management >
Logging > Jobs.

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Lattus Replace Decommissioned Disks 15
c. In the List of Jobs screen, look for the job Initializingnewdisksonmachine<machinename>.
Note: If the job doesn't appear, but the Newemptydisk(s)detectedevent appeared, it
could mean that you replaced the wrong disk(s). Verify that the serial number of disk you
replaced matches the serial number of the decommissioned disk in the disk details PDF you
exported from the Lattus CMC earlier.
d. Select the job to monitor its progress. Once the job completes, its status displays as Done (blue
check mark; initialization was successful) or Error (red check mark; initialization failed) along with
the job's start and end timestamps.
3. If the disks fail to initialize, contact Quantum support and ask them for assistance. Click the failed job to
display its details in the Job Details screen; technical support will need this information to help
determine the cause and resolution for the failed disk initialization.
Repurposing a Disk
In the event that the automatic replacement does not take place (there is no “initializing new disk” job
started), most likely the system cannot detect the purpose of the new disk. (You can see the new disk in the
list of unmanaged disks by navigating to Dashboard > Administration > Hardware > Disks >
Unmanaged.)
If this occurs, you must manually specify the purpose of the new disk by doing the following:
1. In the CMC, go to Dashboard > Administration > Hardware > Disks > Unmanaged.
2. Select the new disk, and in the Commands pane, click Repurpose.
3. In the Use As field, select Replacement Disk.
Note: You can select Replacement Disk only when there is a decommissioned disk. If there are
no decommissioned disks, you can select Additional Disk only as the purpose for the disk.
4. In the Replacement For field, select the decommissioned disk you want to replace.
5. Click Next to start the replacement. A job “Initializing new disks on <name of node>” starts.
6. Repeat steps 1 - 5 for other unmanaged disks.

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What to Do When You're Finished Replacing Disks in the Lattus
Storage Node
If you have additional Lattus Storage Nodes with decommissioned disks that need to be replaced, repeat the
process for each of those nodes.
Caution: Replace the decommissioned disks in one Lattus Storage Node at a time. If you shut down
too many nodes at once, data unavailability may occur.