I have a Red Hat Enterprise Linux Server release 6.7 system. I want to find SAS & SSD disks parts and which parts combine to form which mount points on system or database (Oracle 11gR2) level. For example:

sda + sdb + sdc = /BACKUP

And I want to which storage model using on the server.

I found this command for checking SSD:

lsblk -d -o name,rota

If rota's result equals zero, it is SSD (I'm not sure if it is not true).

But how can I find SAS disks?

I'm a newbie on Linux system, I couldn't find the exact answers to the questions I was looking for.

Best Regards,

  • Your question is not very clear, and I think your terminology is non-standard. Commented Aug 23, 2020 at 12:39
  • Please explain in written English what do you mean by sda + sdb + sdc = /BACKUP and explain a bit how much data do you manage (gigabytes, terabytes, petabytes) and what will happen to you if you lose some of it. Commented Aug 23, 2020 at 12:46
  • @BasileStarynkevitch 11TB and I explained under your answer.
    – jrdba
    Commented Aug 23, 2020 at 12:59
  • And what will happen to you if some gigabytes get lost - by your mistake or by hardware failure? How valuable is that data? What is your backup strategy? Please edit your question to improve it a lot. What kind of data do you manage (porn video, or military secrets, or payrolls) Commented Aug 23, 2020 at 13:08
  • What filesystems are you using? Give in your question the output of df -h and mount ... Without concrete details and some context, your question stays unclear. I voted to close it. Consider editing your question to give a lot more details but don't comment your own question. Explain also what is your computer. Commented Aug 23, 2020 at 13:13

2 Answers 2


You could be interested by the following commands (to be carefully run as root in a terminal emulator, and sometimes cleverly combined in a script or command pipeline): fdisk(8), hwinfo, blkid(8), mount(8), ls(1), df(1), du(1), cpio(1), afio, dd(1), scp(1), tar(1), lspci(8), lsblk(8), fsck(8), dmesg(1), lscpu(1), lsusb(8), lsmod(8), findmnt(8), e4crypt(8)

See also credentials(7), syscalls(2), mount(2), mount_namespaces(7), ext4(5), fstab(5), etc...

See also /sys/ and /dev/ and /proc/ so proc(5), sysfs(5),filesystems(5) and sd(4)

Look also into the various Linux HOWTOs

Take a few hours to read documentation before running commands.

Since a mistake in commands could erase your disks and data. Be prepared to make mistakes and to lose some data (so backup important data on a remote system, perhaps using rsync(1)). Look -using less(1) or GNU emacs, etc...- inside textual files under /etc/

Write on paper -with a pencil- the commands you want to run (e.g. before running them as root), and the day you did run them. Expect to make mistakes. Write on paper the commands you want to learn.

You may need to install additional packages, or to compile open source programs from their source code.

sda + sdb + sdc = /BACKUP

What does that mean?

Read inode(7). Are you referring to multi-volume filesystems or RAID ?

Define and document in writing (at least by emails to colleagues/clients) your backup strategy. You could need extra resources (training, consultancy, books, backup services, time, money, hardware, software).

If you use Oracle (but consider also MySQL and PostGreSQL) spend a few days to read documentation, and dump your important database (perhaps periodically thru crontab(5) into *.sql files, maybe compressed with bzip2 or gzip etc...)

Of course read Advanced Linux Programming and follow a week of Linux sysadmin training. Consider buying some support or training from Linux or database consultants in your area, and discuss preemptively with your manager or client the possibility of losing or leaking data.

Consider using git for your scripts (perhaps with Guile or Python or GNU bash) and database schemas. Try to find help from colleagues or locally (or external consultants)

I'm a newbie on Linux system

Above all, you need time, books, training, mentoring ....

I couldn't find the exact answers to the questions I was looking for.

They could require years of work. Free software is about freedom, not cost.

And please communicate with client or manager and colleagues. It looks you are given responsibilities above your current technical skillsets (which happen to all of us). Discuss with manager or client the possibility of giving a lot more details on forum like this one, and the probability of some future computer related disaster.

Good luck

  • Hi Basile. Firsly, thank you for your answer. For example; Let's say we have 10 discs. 3 of them are sda, sdb and sdc. Let this be the mount point /BACKUP created by combining sda, sdb and sdc disks. Where can I find such information?
    – jrdba
    Commented Aug 23, 2020 at 12:58
  • What will happen to you if some data is lost? Commented Aug 23, 2020 at 13:01
  • I still don't understand your sda + sdb + sdc = /BACKUP equation, so please improve your question Commented Aug 23, 2020 at 13:06
  • I get the axe if some data lost. :)
    – jrdba
    Commented Aug 23, 2020 at 13:07
  • Please improve your question (give more context, and links to documentation you have read) and tell us a bit more about that data. Being French, I don't understand "I get the axe" Commented Aug 23, 2020 at 13:11

Run the following command (in a terminal as root)

lsscsi -t

to show transport information.

  • Hi. What is this meaning? Thank you.
    – jrdba
    Commented Aug 22, 2020 at 19:50

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