ProLiant Servers - Netservers

TC4100 RAID5 expand

 
CA1340350
New Member

TC4100 RAID5 expand

Hi all,
I have a HP TC4100 server with this RAID configuration

Array 0 - Logical drive 0
4 x 18.2 GB - RAID 5 (slot 0,1,2,3)

Array 1 - Logical drive 1
2 x 18.2 GB - RAID 1 (slot 9,10)

Now I want to add 2 new 18.2 GB HD; I've inserted on slot 8, 11 (now my slots are all full) but when I try to use the NetRaid Assistant Wizard to drag and drop the new disk to expand the existing Array 0 disk is added only as Hot Spare

I tried also to use "Logical drive" menu - Change config - Add capacity but it says

"Physical Drive size less than Logical Drive size"

1) How can I change the new "Hot Spare" HD to go back to a READY status ?
2) How can expand my Logical Drive 0 capacity to add the new disks and have a 6 HD RAID configuration ?

Thanks
8 REPLIES 8
kris rombauts
Honored Contributor

Re: TC4100 RAID5 expand

Hi,

don't use the wizard, just open Netraid Assistant and then :

- select both new disks at the same time
(use CTRL key) they should both be in
the Ready state).
- right click on the Logical Drive you want
to add capacity to and select "Advanced
Menu" then "Add drive".
- this should start to the extension of the
Array you selected.

If your array you want to extend has more then one logical drive in it,then you cannot
extent it, this is a limitation of most such class of array controllers in the industry.

If the 2 new disks are not in the Ready status now and are Hotspare disks, then fail them manually (right click on them and choose fail disk) and then rescan, this should bring them in the Ready state and then they can be used in te above procedure.


HTH

Kris
CA1340350
New Member

Re: TC4100 RAID5 expand

Hi Kris,
thank for your response but...I cannot do it :-(

I can select my 2 new disks (on the "Physical Devices" window) - OK

I can select the Array 0 - LD 0 I want to expand, I click the right button - Advanced menu - Add drive and...

NetRaid Assistant asks "Do you want to add all the selected drives" and if I press OK it says

"Physical Drive size less than Logical Drive size"

Any idea how to solve it (and what can be the cause) ?

Thank you

kris rombauts
Honored Contributor

Re: TC4100 RAID5 expand

Hi,

can you specify the following details :

- disk capacity of those 2 new disks (check
the properties in the Netraid Assistant).

- compare with the properties of the disks
in the Logical Drive 0, are they the same
capacity or more/less ?

- what Netraid controller is this (Netraid
2M i.e.? and what F/W revision)

- what Netraid Assistant version are you
using ?

- do you have the same message when you
only add one disk ?


regadrs, Kris
CA1340350
New Member

Re: TC4100 RAID5 expand

Hi Kris,
thank for your support

Disk capacity of new disks
17364 MB (18.2 GB)

Array 0 disks capacity = 17365 --> Capacity is "the same"
Array 0 has 4 disks RAID5 = 52094 MB

Netraid controller 1M
Firmware version H.02.01
BIOS Version G.02.03

NetRaid Assistant Version = B.02.03

Yes I have the same message also If I try to add one disk


I've found a difference (I don't know how important it is..)
Array 0 (old disks) are 10K (rpm)
New disks are 15K (rpm)

Is this the problem ? Is possible to use disks with the same capacity but different speed ?

Thank you
kris rombauts
Honored Contributor

Re: TC4100 RAID5 expand

hmm, could you try to update the controller to the last F/W H.02.02.

This won't fix it but at least the H.02.02 fixes a critical problem for sucessfully rebuilding RAID arrays in case of a disk failure and bad blocks.

The f/w url is copied below, this is a offline process and you need a floppy for it:

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=51917&prodTypeId=329290&prodSeriesId=51915&swLang=13&taskId=135&swEnvOID=54



- you can mix disks with different
rotational speed (RPM) but the 1 Mbyte
difference in capacity is what might be
the issue here, not sure.


What HP productnumber do those disks have ?
i.e. P4619A (for 10 K rpm 18 GByte disks)

Can you get hold of a disk with the exact same size as the ones in A0 to prove this is the issue ?

Have those 2 new disks been previously used on a system ?


I just tried on a system with 3 arrays A0,A1 and A2 on a 2M (same card as 1M just with 2 channels and F/W H.02.02). On the A0 (3 * 18 GByte raid5) i added a 36 Gbyte disk and the raid5 expand just worked fine....maybe their something i'm missing here.


Kris
kris rombauts
Honored Contributor

Re: TC4100 RAID5 expand

I can't confirm by testing but it seems you cannot add a smaller disk (larger disks works fine as i mentioned), check this thread from a while ago... i must be getting old :-)


http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=213251

Kris
kris rombauts
Honored Contributor

Re: TC4100 RAID5 expand

ok, i know what it is, you cannot add disks with smaller capacity to a existing array with larger disks.

I did a quick test with 2* 36 GB in raid1 and tried to add one or 2 * 18 Gbyte disks and i got the popup window telling me :
"Physical Drive size less than Logical Drive size"

So the issue you are having here is that the 2 new disks are a bit smaller in capacity then the original disks in the raid5.

Check with your disk supplier pls


Kris
Sean T. Craig
Honored Contributor

Re: TC4100 RAID5 expand

Hi Comas17,

Kris is absolutely right. You cannot add drives who's capacities are 17364MB to an array of 17365's. The work-around is to recreate the array using all 6 drives. Then the larger ones will use 17364MB of their space. You're logical drive will then be 86820MB.

Hope this is helpful,

Sean T. Craig Sr. C.E.T., M.C.P.

I am King...of my apartment.