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[root@macbook ~]# fdisk /dev/sda

Welcome to fdisk (util-linux 2.41.3).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

This disk is currently in use - repartitioning is probably a bad idea.
It's recommended to umount all file systems, and swapoff all swap
partitions on this disk.


Command (m for help): p

Disk /dev/sda: 233.76 GiB, 251000193024 bytes, 490234752 sectors
Disk model: APPLE SSD SD0256
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 4F3AA6FD-834F-40F4-98AB-A83FDB4D913C

Device       Start       End   Sectors  Size Type
/dev/sda1     2048   1230847   1228800  600M EFI System
/dev/sda2  1230848   5425151   4194304    2G Linux extended boot
/dev/sda3  5425152 152233983 146808832   70G Linux LVM

Command (m for help): n
Partition number (4-128, default 4):
First sector (152233984-490234718, default 152233984):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (152233984-490234718, default 490233855):

Created a new partition 4 of type 'Linux filesystem' and of size 161.2 GiB.

Command (m for help): p
Disk /dev/sda: 233.76 GiB, 251000193024 bytes, 490234752 sectors
Disk model: APPLE SSD SD0256
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 4F3AA6FD-834F-40F4-98AB-A83FDB4D913C

Device         Start       End   Sectors   Size Type
/dev/sda1       2048   1230847   1228800   600M EFI System
/dev/sda2    1230848   5425151   4194304     2G Linux extended boot
/dev/sda3    5425152 152233983 146808832    70G Linux LVM
/dev/sda4  152233984 490233855 337999872 161.2G Linux filesystem    ●

Command (m for help): w
The partition table has been altered.
Syncing disks.

[root@macbook ~]#





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[root@macbook ~]# mkfs.xfs /dev/sda4
[root@macbook ~]# mount /dev/sda4 /mnt/test


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NAME=standard_sequential_1st
fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g  --bs=1024k --readwrite=write     > ~/$(date +%Y%m%d.%H%M%S).$NAME.write.txt;         echo $?
fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=2g  --bs=1024k --readwrite=read      > ~/$(date +%Y%m%d.%H%M%S).$NAME.read.txt;          echo $?
NAME=standard_random_1st
fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=128m --bs=4k   --readwrite=randwrite > ~/$(date +%Y%m%d.%H%M%S).$NAME.randwrite.txt;     echo $?
fio --name=$NAME --ioengine=libaio --direct=1 --directory=/mnt/test --size=128m --bs=4k   --readwrite=randread  > ~/$(date +%Y%m%d.%H%M%S).$NAME.randread.txt;      echo $?


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[root@macbook ~]# egrep 'write:|read:' *txt | awk '{print $1,$4}'
20260303.041153.standard_sequential_1st.write.txt: BW=471MiB/s
20260303.041207.standard_sequential_1st.read.txt: BW=575MiB/s
20260303.041221.standard_random_1st.randwrite.txt: BW=14.9MiB/s
20260303.041237.standard_random_1st.randread.txt: BW=20.7MiB/s
[root@macbook ~]#




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