Use the worksheet in Table 25 to select the disks that will make up the LUNs and storage groups in each storage system. Complete a worksheet for each storage group in your configuration.
Table 25 LUN and storage group worksheet Storage-system number or name:
Storage group ID or name: Server hostname:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
LUN ID or name:
RAID type: RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare
LUN capacity:
Storage-system number or name
Enter the number or name that identifies the storage system. The storage system assigns the storage group ID number when you create the storage group. By default, the ID of the first storage group is 0, the second 1, and so on. Each storage group ID must be unique within the storage system.
Server hostname
Enter the name or IP address for the server. Storage group ID or name
Enter the ID or name that identifies the storage group. LUN name or ID
Enter either the name for the LUN or the number for the LUN ID. The storage system assigns the LUN ID when you create the LUN. By default, the ID of the first LUN is 0, the second 1, and so on. Each LUN ID must be unique within the storage system.
RAID type
Select the RAID type of the LUN, which is the RAID type of the RAID group or thin pool on which it was created. Only RAID 6 and RAID 5 types are available for thin pools.
LUN capacity
Enter the user capacity for the LUN.
LUN details worksheet
Use the worksheet in Table 26 to plan the individual LUNs. Complete as many blank worksheets as needed for all LUNs in the storage system. Table 26 LUN details worksheet
Storage-system information Storage-system number or name:
SP A information
IP address or hostname: Memory (MB):
SP B information
IP address or hostname: Memory (MB):
LUN information LUN ID:
SP owner: SP A SP B SP back-end bus
RAID group ID or thin pool name:
RAID group or thin pool name size (GB):
LUN size (GB): Disk IDs:
RAID type:
RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare SP caching (RAID
group LUN only): Read and write Write only Read only None Servers that can access this LUN’s storage group:
Operating system information Device name: File system, partition, or drive:
LUN or thin LUN information LUN ID:
SP owner: SP A SP B SP back-end bus
RAID group ID or thin pool name:
RAID group or thin pool name size (GB):
LUN or thin pool name size (GB):
Disk IDs:
RAID type:
RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare SP caching (RAID
group LUN only): Read and write Write only Read only None Servers that can access this LUN’s storage group:
Operating system information Device name: File system, partition, or drive:
LUN or thin LUN information LUN or thin LUN ID:
SP owner: SP A SP B SP back-end bus
RAID group ID or thin pool name:
RAID group or thin pool size (GB):
LUN size (GB): Disk IDs:
RAID type:
RAID 6 RAID 5 RAID 3 RAID 1 RAID 0 RAID 1/0 Individual disk Hot spare SP caching (RAID
group LUN only): Read and write Write only Read only None Servers that can access this LUN’s or thin LUN’s storage group:
Storage-system information
Fill in the storage-system information section of the worksheet using the information that follows.
Storage-system number or name
Enter the number or name that identifies the storage system. SP A and SP B information
Fill out the SP A and SP B information section in the worksheet using the information that follows.
IP address or hostname
Enter the IP address or hostname for the SP. The IP address is required for connecting to the SP. You do not need to complete it now, but you will need it when the storage system is installed so that you can set up communication with the SP.
Memory
Enter the amount of memory on the SP. LUN information
Fill in the LUN information section of the worksheet using the information that follows.
LUN ID
Enter the number for the LUN ID. The LUN ID is a number assigned when you create a LUN on a RAID group or a thin LUN on a thin pool. By default, the ID of the first LUN bound is 0, the second 1, and so on. Each LUN ID must be unique within the storage system, regardless of its storage group or RAID group. The maximum number of LUNs supported on one host bus adapter depends on the operating system. SP owner
Select the SP that you want to own the LUN. You can let the management program automatically select the SP to balance the workload between SPs; to do so, leave this entry blank.
SP back-end buses
A back-end bus consists of a physical back-end loop on one SP that is paired with its counterpart physical back-end loop on the other SP to create a redundant bus. Each SP supports one physical back-end loop that is paired with its counterpart SP to create a redundant bus (bus 0). The bus designation appears in the disk ID (in the form bed, where b is the back-end bus number, e is the enclosure number, and d is the disk position in the enclosure). For example, 013 indicates the fourth disk on bus 0, in enclosure 1 (numbering 0, 1, 2, 3... from the left) in the storage system. Navisphere Manager displays disk IDs as b-e-d, and Navisphere CLI recognizes disk IDs as b-e-d.
RAID group ID or thin pool name
Enter the number for the RAID group ID or the name for the thin pool. When you create a RAID group, you can either assign an ID to it or have the storage system assign one automatically. If the storage system assigns the RAID group IDs automatically, the ID of the first RAID group is 0, the second 1, and so on. Each RAID group ID must be unique within the storage system. When you create athin pool, you must assign a name to it, even though the storage system assigns an ID to it automatically. Each thin pool name must be unique within the storage system. The ID of the first thin pool is always 0, the second 1,
RAID group or thin pool size
Enter the user-available capacity in gigabytes (GB) of the whole RAID group or thin pool. For a RAID group, the user capacity is assigned to physical storage on the disks in the group when you create the group. For a thin LUN, the user capacity is assigned to physical storage in a capacity-on-demand basis from a shared thin pool of disks. The storage system monitors and adds storage capacity, as required, to each thin pool until its physical capacity is reached. You can determine the RAID group capacity using Table 27.
Table 27 RAID group capacity
RAID group Disk capacity (GB)
RAID 6 group disk-size x (number-of-disks - 2) RAID 5 or RAID 3 group disk-size x (number-of-disks - 1) RAID 1/0 or RAID 1 group (disk-size x number-of-disks) / 2 RAID 0 group disk-size x number-of-disks Individual unit disk-size
The 1 TB SATA disks operate on a 4 Gb/s back-end bus like the 4 Gb FC disks, but have a 3 Gb/s bandwidth. Since they have a Fibre Channel interface to the back-end loop, these disks are sometimes referred to as Fibre Channel disks. The currently available disks and their usable disk space are listed in EMC® CX4 Series Storage Systems – Disk and FLARE® OE Matrix (P/N 300-007-437) on the EMC Powerlink website.
The vault disks must all have the same capacity and same speed. The 1 TB, 5.4K rpm SATA disks are available only in a DAE that is fully populated with these disks. Do not mix 1 TB, 5.4K rpm SATA disks with 1 TB, 1.2K rpm SATA disks in the same DAE, and do not replace a 1 TB, 5.4K rpm SATA disk with a 1 TB, 1.2K rpm SATA disk or a 1 TB, 1.2K rpm SATA disk with a 1 TB, 5.4K rpm SATA disk.
LUN size
Enter the user-available capacity in gigabytes (GB) of the LUN. The total user capacity of all the LUNs on a RAID group cannot exceed the total user capacity of the RAID group. You can make LUN size the same size or smaller than the user capacity of the RAID group. You might make a LUN smaller than the RAID group size if you want a RAID 5 group with a large capacity and you want to place many smaller capacity LUNs on it, for example, to specify a LUN for each
user. You can make the thin LUN size greater than the user capacity of the thin pool because thin provisioning assigns storage to the server in a capacity-on-demand basis from a shared thin pool. The storage system monitors and adds storage capacity, as required to each thin pool. If you want multiple LUNs per RAID group or multiple thin LUNs per thin pool, then use a RAID group/LUN series or thin pool/thin LUN series of entries for each LUN or thin LUN. The LUNs is a RAID group or thin pool share the same total performance capability of the disk drives, so plan carefully.
Disk IDs
Enter the IDs of all disks that will make up the LUN or hot spare. These are the same disk IDs you specified on the previous worksheet. For example, for a RAID 5 group or thin pool in a DAE on bus 0 (disks 10 through 14), enter 0010, 0011, 0012, 0013, and 0014.
RAID type
Copy the RAID type from the previous worksheet, for example, RAID 5 or hot spare. For a hot spare (strictly speaking not a LUN at all), skip the rest of this LUN entry and continue to the next LUN entry (if any). SP Caching
Select the type of SP caching you want — read and write, write, read, or none — for this LUN.
FAST (tiering) policy (pool LUN only)
If the storage system has two of more types of disks (FC, SATA, Flash) and the FAST enabler installed, select the policy for placing data on this storage as it is written to the storage — Auto-Tier, Highest Available Tier, Lowest Available Tier, No Data Movement.
Servers that can access this LUN’s storage group
For switched shared storage or shared or clustered direct storage, enter the name of each server (copied from the LUN and storage group worksheet). For unshared direct storage, this entry does not apply. Operating system information
Fill out the operating system information section of the worksheet using the information that follows.
Device name
Enter the operating system device name, if this is important and if you know it. Depending on your operating system, you may not be able
File system, partition, or drive
Write the name of the file system, partition, or drive letter for this LUN. This is the same name you wrote on the application worksheet.
On the following line, write any pertinent notes, for example, the file system mount-point or graft-point directory pathname (from the root directory). If any of this storage system’s LUNs will be shared with another server, and the other server is the primary owner of this LUN, write secondary. (As mentioned earlier, if the storage system will be used by two servers, complete one of these worksheets for each server.)
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