Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
Drive not appear in /dev
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware
View previous topic :: View next topic  
Author Message
mkp
n00b
n00b


Joined: 27 Oct 2016
Posts: 8

PostPosted: Mon Nov 28, 2016 8:12 am    Post subject: Drive not appear in /dev Reply with quote

Hi,

I have a problem with one new hdd attached to Gentoo box. It's connected to Adaptec 1220sa with another drive. Both are new and 2tb size but only one is visible. Both are shown in kernel logs, one is /dev/sdd, other is /dev/sde but when try fdisk /dev/sde i've got error "Unable to open /dev/sde". If i check /proc/partitions it's there.

Code:
test linux-3.6 # cat /proc/partitions
major minor  #blocks  name

   8        0  234431064 sda
   8        1     112640 sda1
   8        2   40163328 sda2
   8        3  194153472 sda3
   8       16 1953514584 sdb
   8       32 1953514584 sdc
   8       48 1953514584 sdd
   8       64 1953514584 sde
  11        0    1048575 sr0
   9        0 1953514496 md0


The drive is visible only in logs and if i run lshw:

Code:
*-disk UNCLAIMED
       description: ATA Disk
       product: WDC WD20EFRX-68E
       vendor: Western Digital
       physical id: 0.0.0
       bus info: scsi@5:0.0.0
       version: 82.0
       serial: WD-WCC4M2JL0FCJ
       configuration: ansiversion=5


Before that Adaptec, i tried asm1061 controler .. the result was the same. The problem is that i have only 4 sata ports on motherboard and 5 drives. Is there something in the kernel config which i miss? It's not possible to have limitation of connected drives.

How to find what is wrong?

Thanks.
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 43182
Location: 56N 3W

PostPosted: Mon Nov 28, 2016 12:22 pm    Post subject: Reply with quote

mkp,

That controller supports fakeraid and Just A Bunch Of Drives (JBOD) mode.
If its in fakeraid mode, the operating system will see both drives at a low level but only one (the raid set) at a higher level.

Make sure its in JBOD mode.

If that's not it, post your lspci output.

If you want another wild guess. the card implements a SATA Expander. That's like a hub to have more that one drive on a single SATA port.
That's not quite so horrible an it sounds, its only a single lane PCIe card so it can't keep both dives busy at the same time anyway.
SATA Expander is a kernel option.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
mkp
n00b
n00b


Joined: 27 Oct 2016
Posts: 8

PostPosted: Mon Nov 28, 2016 1:08 pm    Post subject: Reply with quote

Hi NeddySeagoon,

I set a fake raid1 through adaptec menu. I know it's normal to see only 1 drive but if it's a hardware raid. So, do i have same info on this 2 drives or not? Like is normal when have raid1.

Thanks.
Back to top
View user's profile Send private message
szatox
Veteran
Veteran


Joined: 27 Aug 2013
Posts: 1746

PostPosted: Mon Nov 28, 2016 1:38 pm    Post subject: Reply with quote

mkp, don't mistake hardware-dependent software raid with actual hardware raid.
Fakeraid is the former, which means it collects all the disadvantages from both worlds. If you don't have a really good reason to use it, simply disable it and use plain softraid instead (mdraid, lvm, anything but fake raid).
Quote:
So, do i have same info on this 2 drives or not?
We don't have any way to know for sure what option did you set. I suppose* it's a sort of capacity raid: either striped RAID0 or linear JBOD (next drive appended to previous one).
You can try getting some information from lsblk: what is the size of your fakeraid compared to physical drives inside?


* If you put 2 drives in, you obviously want to see the available space double. Making mirrors by default would result in shitloads of complains from unhappy SOHO users. I'm intentionally leaving any comments on usefulness of redundancy out, because it not the point here.
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 43182
Location: 56N 3W

PostPosted: Mon Nov 28, 2016 7:04 pm    Post subject: Reply with quote

mkp,

Its not hardware raid.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
mkp
n00b
n00b


Joined: 27 Oct 2016
Posts: 8

PostPosted: Mon Nov 28, 2016 8:31 pm    Post subject: Reply with quote

Hi,

It was so simple. Just execute MAKEDEV sdX and voila , drive appear.

Thanks.
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum