2 disk failed in one mirror group of raid10

[bkzk]

Hi everyone

It's ma first time here, I have a strange problem , my hp server with p410 controller is reporting that
my two disks are failed in this same mirror group but the array is working and system also is working which 
is odd because in this scenario the whole array should failed .  

Here is some output from hpacucli : 

Smart Array P410 in Slot 1 (sn: PACCRID1214191P)

array A (SAS, Unused Space: 0 MB)


logicaldrive 1 (558.9 GB, RAID 1+0, Interim Recovery Mode)

physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 300.0 GB, OK)
physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 300.0 GB, OK)
physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 300.0 GB, Failed)
physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 300.0 GB, Failed)

...

Logical Drive: 1
Size: 558.9 GB
Fault Tolerance: RAID 1+0
Heads: 255
Sectors Per Track: 32
Cylinders: 65535
Strip Size: 256 KB
Status: Interim Recovery Mode
Array Accelerator: Enabled
Unique Identifier: 600508B1001C31044F93A9CDBD271A9E
Disk Name: /dev/sda
Mount Points: /boot 200 MB, /tmp 5.0 GB, / 537.7 GB
Logical Drive Label: A02DE4B1PACCRID1214191PDAD9
Mirror Group 0:
physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 300.0 GB, OK)
physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 300.0 GB, OK)
Mirror Group 1:
physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 300.0 GB, Failed)
physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 300.0 GB, Failed)

...

physicaldrive 1I:1:3
Port: 1I
Box: 1
Bay: 3
Status: Failed
Drive Type: Data Drive
Interface Type: SAS
Size: 300.0 GB
Rotational Speed: 15000
Firmware Revision: A5D0
Serial Number: LVWHZBDM
Model: HITACHI HUS156030VLS600
Current Temperature (C): 38
PHY Count: 2
PHY Transfer Rate: 3.0GBPS, Unknown

physicaldrive 1I:1:4
Port: 1I
Box: 1
Bay: 4
Status: Failed
Drive Type: Data Drive
Interface Type: SAS
Size: 300.0 GB
Rotational Speed: 15000
Firmware Revision: A5D0
Serial Number: LVWHZ8BM
Model: HITACHI HUS156030VLS600
Current Temperature (C): 34
PHY Count: 2
PHY Transfer Rate: 3.0GBPS, Unknown

Also I noticed that smartctl not reporting anything for this two failed disk, it's look like this

disk dissapeared for smart monitor (smartctl) - but disk could not phisically failed because 

the system is working. 

Some idea here .. ?

[Torsten.]

It is a bit strange, since the document http://h20195.www2.hp.com/V2/GetPDF.aspx%2F4AA4-7979ENW.pdf is showing this:

If this is really the case, the data would be corrupted.

But the status is interim recovery, so it looks like group1 is mirrored to group2?

[Torsten.]

Meanwhile I found something different that tells the "low ID drives" are striped together and the "high ID drives" are striped together, then the groups are mirrored. This would mean group 0 is mirrored to group 1 - this may explain why the system is still working.
Maybe someone can confirm ...

[edit]

this was regarding RAID 0+1, not RAID 1+0, sorry

[bkzk]

Maybe i misunderstand sth , but if two drives are stripped and second pair of drives are stripped and  this is mirrored then we talk about raid 01 not raid 10