Exclude the following drives from spinning down, sda to sdi, which is which?

[qneeuqeo]

I have 2 external HDD connecting to RT-AC68U, they spin 24x7 in the past year and start made some strange noise when running. I realised the HDD power management function are not enabled by default till today Now I want one of the drive to spin down when idle.

under the "Tools - Other Settings", I'm confused with this:

Exclude the following drives from spinning down sda sdb sdc sdd sde sdf sdg sdh sdi

Can anyone please tell me which option should I tick to spin down one of my HDD?

Thanks.

 

[kcobain1992]

I think "exclude from spinning down" is pretty self-explanatory: only tick the hard drives that you DON'T want to stop spinning.
If you don't want both to stop spinning, then issue the following command while logged in through telnet/ssh on the router:
blkid
This should give you a list of available disk drives, along with their associated labels and UUIDs.
If you still don't recognise which is which, you can ask details about each one. Example for /dev/sda:
fdisk -l /dev/sda

 

[qneeuqeo]

problem solved, much appreciated

sda, sdb indicates each external usb disk.

as the options contains "sda sdb sdc sdd sde sdf sdg sdh sdi "

can I assume that the router supports to connect up to 9 external usb disk in total?

 

[RMerlin]

problem solved, much appreciated

sda, sdb indicates each external usb disk.

as the options contains "sda sdb sdc sdd sde sdf sdg sdh sdi "

can I assume that the router supports to connect up to 9 external usb disk in total?

Asuswrt supports up to 26 disks actually, but for sake of UI simplicity, I limited it to what I felt was a reasonable limit (and which would fit in one single line).

 

[Jheroen]

A: can you use an USB hub connected to one usb port on the router to connect more drives?
B: if you can't or don't use ssh or telnet how do you know which drive is which code (sda/sdb)

 

[RMerlin]

A: can you use an USB hub connected to one usb port on the router to connect more drives?
B: if you can't or don't use ssh or telnet how do you know which drive is which code (sda/sdb)

USB 2.0 hubs are supported.

You will have to use ssh/telnet, or browse through syslog looking for any reference to sda,sdb,sdc, etc...