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--- nas:build_a_linux_nas:prepare_the_raid_disks [2021/09/25 15:53] – [Create a Linux RAID Partition] peter
+++ nas:build_a_linux_nas:prepare_the_raid_disks [2021/10/12 20:36] (current) – [Test the Disks] peter
@@ Line 24: / Line 24: @@
 **NOTE:**  This shows:
-  * **sda**:  The boot disk of the host OS.
+  * **sda**:  The boot disk of the host OS. Leave this alone!
   * **sdb**:  A free disk.
   * **sdc**:  A free disk.
@@ Line 30: / Line 30: @@
 The free disks do not have any partitions yet and will be included into a RAID.
+</WRAP>
+----
+===== Obtain the Serial Numbers of the Disks =====
+<code bash>
+hdparm -i /dev/sdd | grep SerialNo
+</code>
+returns:
+<code bash>
+Model=ST16000NM001G-2KK103, FwRev=SB30, SerialNo=WL2091XL
+</code>
+<WRAP important>
+**IMPORTANT:**  Obtain the serial number for every disk; and keep a record of this somewhere safe.
+</WRAP>
+<WRAP info>
+**NOTE:**  Many disks also have the serial number written on the disk.
+The reason for recording the serial number of each disk is that in the case of a disk failure, there needs to be a way to determine which disk has failed and needs to be replaced.
+  * The enclosure being used for the disks may not support hot-swapping and there may not be a separate light for each disk, so there may not be a straight-forward way to determine which specific disk has failed.
+</WRAP>
+----
+===== Test the Disks =====
+All hard drives, both new and old, should be tested before adding them to an array.
+See S.M.A.R.T. to view smart data and run smart tests.
+Do a short smart test:
+<code bash>
+smartctl -t short /dev/sdb [-d sat]
+</code>
+Do a long smart test:
+<code bash>
+smartctl -t long /dev/sdb [-d sat]
+</code>
+Check all smart attributes:
+<code bash>
+smartctl -a /dev/sdb [-d sat]
+</code>
+Do a random readwrite test:
+<code bash>
+sudo fio --filename="/dev/sdb --name=randwrite --ioengine=sync --iodepth=1 --rw=randrw --rwmixread=50 --rwmixwrite=50 --bs=4k --direct=0 --numjobs=8 --size=300G --runtime=7200 --group_reporting
+</code>
+<WRAP info>
+**NOTE:** The smartmontools package might be needed to be installed:
+<code bash>
+sudo apt install smartmontools
+</code>
+  * **-d sat**:  Sata disks.
+See:  https://www.smartmontools.org/
 </WRAP>
@@ Line 125: / Line 198: @@
 <WRAP info>
-**NOTE:** Just taking the default values uses the entire disk.
+**NOTE:** This shows that there is a single partition, /dev/sdb1, using the entire disk.
 </WRAP>
@@ Line 197: / Line 270: @@
 ===== Partition other Disks =====
-Repeat the above instructions for the other free disks.
+<WRAP info>
+**NOTE:** Repeat the above instructions for the other free disks.
+</WRAP>
 ----