cyberfella IT SME

The Journal size is a question of the required protection window (a Business requirement) and the incoming write rate of the production application.  Whilst the Recovery Point Objective might be known, the incoming write rate of a newly deployed app may not be, making sizing of journal LUNs a bit “finger in the air”.  EMC provide a guideline value of 20% in this instance, but it has no real foundation.

The basic calculation is ( protection window in seconds * write rate in seconds ) / 0.7
The division by 0.7 is because roughly 70% of the journal is used for replication images.

For example, if the business requires 1 day of images and the average write rate by the application is 1MB/s you will need a minimum of about 125GB journal to support it.  RecoverPoint supports automatic journal LUN creation during configuration of a Consistency Group if you don’t have enough information to manually size the journal LUN up front.

During a recent deployment of RecoverPoint to support replication of LUNs to remote storage, solely for the purposes of failover, EMCs response was as follows.  Please note that in this scenario, there was no requirement for the “killer functionality” of RecoverPoint, namely point in time recovery using the journaled changes in Consistency Groups.  That’s not to say it won’t become a requirement later on however.

The Raid group in question would definitely be adequate to start replication, but whether it is enough to meet the business requirements, we cannot say.

Sizing aside, remember that it is very important to use a dedicated Storage Pool/RAID Group of physical disks that is entirely separate to ones used for your data LUNs and RecoverPoint Repository LUN.

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A more complete set of commands for use on MDS switches, with a useful set of commands at the top for exporting useful information (by logging session output of PuTTY terminal).  Note that using a ? after any command will show possible commands.

Export useful information

show switchname (display hostname on network)

show flogi database (shows wwn of fc connected hosts logged in to the switch ports)

—————————————————————————
INTERFACE VSAN FCID PORT NAME NODE NAME
—————————————————————————
fc1/1      60      0xad04d1       50:05:07:61:13:61:a6:33 51:01:07:63:11:20:a6:33
fc1/2      60     0xad0012       50:05:07:63:12:13:51:37 50:01:07:61:12:03:55:37

show interface description (shows description field for each physical port)

show interface brief (shows ports in errDisabled state)

——————————————————————————-
Interface Description
——————————————————————————-
fc1/1         L5500_CyberfellaTD1_1_A
fc1/2        L5500_CyberfellaTD2_1_A

show vsan (display vsans configured)

show zone vsan 10 (display zones in vsan)

show zoneset vsan 10 (display zoneset, zonenames and wwns in zones)

show fcalias vsan 10 (display human friendly alias for each wwn in all zones in vsan 10)

ENABLE A NEW PORT

Before you can create your zones, the device connected to the fc switch will need to flog in so you can see its wwn.  Before it can do that, the port itself will need to be opened/enabled.

conf t

interface fc1/21       (where 21 is the port number)

no shutdown           (obviously!)

exit

more here

ZONING

If you have to do some CISCO zoning at the command line here are a few of my favorite commands;

original cisco doc here…

To create an alias:

conf t
fcalias name {alias_name} vsan {vsan number}
member pwwn {wwid}
exit

To create a zone:
conf t
zone name {zone _name} vsan {vsan_number}
member {alias_name}
member {alias_name}
.
.
exit

To add it to the zoneset:
conf t
zoneset name {zoneset_name} vsan {vsan_number}
member {zone_name}
.
.
exit

To activate the zone/zoneset:
conf t
zoneset activate name {zoneset_name} vsan {vsan_number}
exit

Save the configuration
copy running-config startup-config

Displaying Zone Information

You can view any zone information by using the show command. If you request information for a specific object (for example, a specific zone, zone set, VSAN, alias, or even a keyword like brief or active), only information for the specified object is displayed. If you do not request specific information, all available information is displayed. Table 4-1 lists the show commands and the information they display.

Table 4-1 show zone and show zoneset Commands

show Command
Description
show zone

Displays zone information for all VSANs.

show zone vsan 1

Displays zone information for a specific VSAN.

show zoneset vsan 1

Displays information for the configured zone set.

show zoneset vsan 2-3

Displays configured zone set information for a range of VSANs.

show zone name Zone1

Displays members of a zone.

show fcalias vsan 1

Displays fcalias configuration.

show zone member pwwn 21:00:00:20:37:9c:48:e5

Displays membership status.

show zone statistics

Displays zone statistics.

show zone statistics read-only-zoning

Displays read-only zoning statistics.

show zoneset active

Displays active zone sets.

show zoneset brief

Displays brief descriptions of zone sets.

show zone active

Displays active zones.

show zone status

Displays zone status.

show zone

Displays zone statistics.

show running

Displays the interface-based zones.

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Assign hostname to switch

switchname <hostname>

Create Inter-Site Links (join two switches together to share zones)

conf t
trunk protocol enable #to enable trunking protocol
conf t
no trunk protocol enable #to disable trunking protocol

trunk protocol auto #to set trunking in auto mode . The preferred conf for CISCO MDS switches is (on) (auto) – one switch enabled, second is auto.

1. Connect 2 switches with FC cable on ANY port
2. In each switch, change port mode to TE:
show interface fc1/1
or
show running-config interface 1/1 # to see a current configuration
config t
interface fc1/1
switchport mode auto /on /off #will automatically set the port in TE mode in case it was previously set in another mode

3. Trunking ports should remain in VSAN1
4. Create new VSAN (same name and number) on both switches.
5. On both switches, run:
config t
interface fc1/1
switchport trunk allowed vsan 2-4 (To configure an allowed-active list of VSANs for an interface)
switchport trunk allowed vsan add 6 (Expands the specified VSAN 6 to the new allowed list)
no switchport trunk allowed vsan 2-4 (Disallow VSANS from being trunked)
no switchport trunk allowed vsan 5

One important note: you should create a VSANs BEFORE you allowing trunking on them –
otherwise trunking port will be automatically disabled due to VSAN mismatch.
Same problem can occur, if trunking interfaces are located in different VSANs
(for example, fc1/1 on switch A is in VSAN 2, while fc1/9 on switch B is in VSAN 3).

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