Hi,

if used for NAS file systems you cannot extend a raidgroup and you need to add raidgroups in one of the supported size.

that means for RAID5 to use either 5 or 9 drives

if you only have two drives to add you only choice is RAID10 which will end up in a different pool

Rainer

Currently I have 13 drives total. I have a clar_r1 Mirrored Pair pool = 366.8GB and a clar_r5_performance pool RAID 5 4+1 = 2.6TB. I only have a 15 slot shelf therefore I can only add 2 additional drives. Can I swap out the HS 400G drive for a 450G drive? How do I determine which drive is the HS. Also, Can I tear down the calr_r1 pool and use those 2 mirrored drives and 2 new drives to create a RAID3+1?

3+1 is not supported and will not work

cat /etc/hosts to find out SP address and then

/nas/opt/Navisphere/bin/navicli -h SP_Address getall > getall.out

open the file and look for something similar to this, you can see the disk being defined as HS

RaidGroup ID:                              200
RaidGroup Type:                            hot_spare
RaidGroup State:                           Explicit_Remove
                                           Valid_luns
List of disks:                             Bus 0 Enclosure 0  Disk 5
List of luns:                              200
Max Number of disks:                       1
Max Number of luns:                        1
Raw Capacity (Blocks):                     769161016
Logical Capacity (Blocks):                 769161016
Free Capacity (Blocks,non-contiguous):     56
Free contiguous group of unbound segments: 56
Defrag/Expand priority:                    Low
Percent defragmented:                      100
Percent expanded:                          100
Disk expanding onto:                       N/A
Lun Expansion enabled:                     NO
Legal RAID types:                          hot_spare
Hot Spare Replacing RAID Group:            Inactive

Currently I have 13 drives total. I have a clar_r1 Mirrored Pair pool =  366.8GB and a clar_r5_performance pool RAID 5 4+1 = 2.6TB. I only have a  15 slot shelf therefore I can only add 2 additional drives

The smallest alternatives are Raid10 using two disks, 2 Raid10 pairs using 2x2 disk and then Raid5 (4+1)

in your example you have:

----------------------------------------------------------------

0_0:  400 400 400 400 400 400 400 400 400 400 400 400 400
FC     0   0   0   0   0   HS  1   1   1   1   1   2   2  EMP EMP
----------------------------------------------------------------

0: Raudgroup 0 Raid5(4+1)

HS: Hot Spare

1: Raudgroup 1 Raid5(4+1)

2: Raudgroup 2 Raid10

EMP: Empty

When adding two more disks, the easiest way ist another Raid10 2 disk pair. (3+1 is not supported)

Problem is you have to replace the 400 GB HS with one of the biggest disks (450GB)

Tearing down the existing raid10 group does not help.

If you want to maximize the available disk space, you need to tear down the existing Raid10 group and the Raid5(4+1) group (Raidgroup 1)between HS and Raid10.

Then there are only the first 6 disks used, and you can create a new Raid5(8+1) group on all of the remaining disks.

Thanks to all for the information. Since 2 RAID10 pools won't help me I've requested pricing and hopefully mgmt approval on adding an additional shelf and one more drive to form another RAID5 4+1. I really appreciate the help in determining which drive is the hot spare. I assume I have to power off the chassis, swap the HS drive and then power the system back up but since it will be in the same slot do I have to tell the NAS or will it automatically use it as the HS? Thanks again for all the information.

you don't have to power off the shelves. I used NST , connected to the back of the Clariion on management port (you can use Navisphere if it's fiber enabled unit)  and deleted the LUN/Raid group that comprised the HS, told NST i want to remove the drive, pulled the drive and told NST i want to insert new drive. Once that was done i re-defined the HS on the new (bigger drive)

Download NST from Powerlink

Home > Support > Product and Diagnostic Tools > CLARiiON Tools > About Navisphere Service Taskbar

Each Clariion SP (service processor) has a management port,  one is assigned IP address 128.221.1.250 and the other 128.221.1.251. Assign your laptop ip address 128.221.1.249, subnet mask 255.255.255.248, no gateway. Connect with a regular cat5 cable from your laptop to one of the management ports on SP. At this point you should be able to ping one of the IPs (128.221.1.250 or 128.221.1.251). Open your browser and connect one of the SPs. You will be logged-in into Navisphere. I believe default username and password are "nasadmin". Find the hot spare LUN, unbind it and the delete the raid group where that LUN was (Be very very careful here to delete correct LUN and RAID Group).

Now start NST and tell it to connect to one of the SPs, tell it you want to remove drive, tell it which drive and then remove it (i am telling you from memory here). Then tell NST you want to insert new drive, pop new drive in. Then in Navisphere select to create new raid group, select type "hot spare" and manually pick the drive you just inserted. This should create the raid group as well as the LUN inside of it (very import, expand the raid group, private LUN ..make sure there is one listed there with a big + on it.)

if you don't feel comfortable doing this, your local CE can assist you with this.

Thanks. I do not have the Navisphere loaded into celerra manager (or at least a license). However, I do not know what NST is. Since I have celerra I assume the mgmt port is not open.

no problem. Before we make new disk purchases i always refer to this document just to make sure i am inline with one of the supported configs for my Celerra

http://corpusweb130.corp.emc.com/ns/common/post_install/Configure_storage_Non_FC.pdf

Fantastic. I downloaded it and will give it a shot. To bad they don't have a mac version. I'll have to install it in Parallels. Thanks for all the help. We are going to purchase an additional dae and drive for each NAS. I'm a little ticked cause when we bought our NAS's I could have purchased one additional drive for each and had a RAID5 8+1 to begin with. Oh well. Thanks.

I dont think you need NST for this

With nas_storage you can delete hot spares and with CPW you can create new hot spares using SPW

See attached for SPW info