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External Storage XP and FlexCopy XP. Module 9. HP Restricted. Objectives. Describe features, functionality and limitations of FlexCopy XP Describe features, functionality and limitations of External Storage XP. External Storage XP functionality.

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objectives
Objectives
  • Describe features, functionality and limitations of FlexCopy XP
  • Describe features, functionality and limitations of External Storage XP

HP Restricted

external storage xp functionality
External Storage XP functionality
  • External Storage is a capability resident on XP12000 disk arrays that enables you to copy data in both directions between an XP12000 Disk Array and an external disk array
  • You can also use External Storage XP for offline data migration, providing a point-in-time copy of data to/from an external device to the XP12000 disk array

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xp12000 external storage
XP12000 External Storage
  • Reduces costs by using less expensive external storage
  • Tiered storage: Up to 32PB of storage can be handled and presented by a single XP12000
  • Variety of supported external arrays
  • All LUNs are presented as XP12000 LUNs and can transparently be copied and moved between tiers
  • Direct Fibre Channel or SAN connection between XP Next Gen and external storage devices
  • Supports Continuous Access, Business Copy, AutoLUN

Hosts

SAN

CHIP

up to

32PB

FC

CHIP

create Copy

SAN

migrate

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xp12000 external storage1
XP12000 External Storage

Host

SAN

External Target Ports

FC Host Ports

LUNs presented to Hosts

Internal Logical Devices

Ldevs

4

6

x

y

n

1

2

3

External Arrays

XP internal disks

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external storage redundant paths 1
External storage redundant paths (1)
  • the XP disk array as external storage will use >=2 paths (basic requirement)
  • additional paths can be added through the GUI (SVP or CV)
  • XP/HDS Lightning & Thunder as external storage offers load balancing and failover mode for redundant paths
  • the path priority controls either:
    • failover sequence
    • usage in load balancing mode
  • for MSA only failover mode is supported today

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msa1000 1500 special considerations
MSA1000/1500 special considerations

External storage redundant pathes (3)

MSA1000/1500

RAID500

External

Port

LUN

Path 1

Switch

A

1

CL1

-

A

WWN A

5

External

Internal

Volume

Volume

Port

LUN

External

B

5

WWN B

CL2

-

A

Path 2

  • use at least 2 XP external ports from different clusters
  • do not connect the standby controller to the FC switch
  • there is a manual procedure to replace the active controller withoutloosing access to the data on the MSA
  • you may use the standby controller – swapping the controllers, notswapping FC cables !

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msa configuration failure reporting
MSA configuration & failure reporting

SIMs concerning External Storage provide no real detail, (e.g. vendor, SN, LU, Link Failure) So external storage will need its own failure reporting mechanism

Host

MODEM

Panther

SVP PC

C-Track

phone

home

Failure Reporting

SAN

MSA Config/Control &

Failure Reporting PC

supported host due to MSA streams

MSA

  • Failure Reporting
  • WEBES / ISEE
  • or other legacy reporting

dedicated to XP

Required

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external storage and other xp functionality
External Storage and other XP functionality
  • You can use the following products to manage external LUs you have mapped using External Storage XP
    • LUN Expansion (LUSE) and Volume Management
    • Cache LUN XP
    • Auto LUN XP
    • Business Copy XP
    • Configuration File Loader
    • (LUN Security XP Extension)

Note: Continuous Access XP is not supported with External Storage XP at first release

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external storage licensing
External Storage Licensing
  • E-LUN:
    • required licenses:
      • External Storage XP license(used capacity based)
      • LUN Configuration Manager XP license(raw capacity based = usable capacity of external storage)
      • Command View XP license(array based)
    • optional licenses:
      • LUN Configuration Manager XP on legacy XP(raw capacity based)

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esxp actual capacity available 1 of 4
ESXP – Actual Capacity Available (1 of 4)

Type 1: External volumes up to 2TB defined as OPEN-V

When an external LU of a size of 2 TB or smaller is defined with an emulation of OPEV-V, the exact size of the external volume will be available to the HOST (the HOST itself will see the exact same value as expected from the original LU)

In the XP display however, the mapped LU might be displayed with a slightly larger size than it actually has. This is due to the slot management method in the XP

Size displayed size to the HOSTs:

External Vol Capacity = 30GB

30GB = 31457265[Kbytes]

31457265 Kbytes = 62914530[LBA]

30GB

External

LU

OPEN-V

Size displayed in the XP:

Adjust Slot Count

62914530[LBA] ÷ 512 = 122879.9

122879.9 (round up) = 122880[SLOT]

Convert to HBA again

122880 x 512 = 62914560[LBA]

This is the capacity displayed in the Add LU SVP screen.

Ext Volume capacity

is 62914530 (LBA)

Adjusted capacity

For internal control

is 62914560 (LBA)

Notes: 1. For OPEN-V, 1 SLOT has 512 LBA.

2. The volume is controlled by the # of slots used. This is part of the control method.

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esxp actual capacity available 2 of 4
ESXP – Actual Capacity Available (2 of 4)

Reference Information: Emulation size data

The calculation represented under the GB(10**9) is the catalog capacity representation and the calculation represented under the GB(1024**3) column is the actual capacity of each OPEN-x LVI

Use number of blocks for any type of external capactiy handling if possible

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esxp actual capacity available 2b of 4

OPEN-3

OPEN-8

OPEN-9

OPEN-E

OPEN-L

OPEN-V

usable capacity

blocks

4806720

14351040

14423040

28452960

71192160

4294967296

usable capacity

GB

2,29

6,84

6,88

13,57

33,95

2048,00

space used on ext LUN per ldev

blocks

4818240

14389920

14461920

28480320

71202240

4294967296

overhead

blocks

11520

38880

38880

27360

10080

overhead

percent

0,24%

0,27%

0,27%

0,10%

0,01%

min size of ext LUN

blocks

83520

110.880

110880

99360

82080

384000

min usable capacity

blocks

72000

72000

72000

72000

72000

96000

min usable capacity

MB

35,16

35,16

35,16

35,16

35,16

46,88

maximum usefull E-LUN size

blocks

1207934976

1207934976

1207934976

1207934976

1207934976

4294967296

maximum usefull E-LUN size

GB

575,99

575,99

575,99

575,99

575,99

2048,00

maximum LDEVs

ldev

250

83

83

42

16

1

max usable capacity of an E-LUN

GB

573,01

567,98

570,83

569,83

543,15

2048,00

ESXP – Actual Capacity Available (2b of 4)
  • max 256 LDEVs per external LUN being mapped, but ...

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esxp actual capacity available 3 of 4
ESXP – Actual Capacity Available (3 of 4)

Type 2: Emulation Types other than OPEN-V

When using an emulation type other than Open-V, then some of original space of the external volume will also be used to create areas for control data. Each control area equals 8 cylinders in size, which is 5,760KB

OPEN-3

OPEN-3

2403360KB

(2461040640 bytes)

6GB

External

LU

OPEN-V

OPEN-3

FREE

CYN - cylinder

1 cylinder = 15 tracks

1 track = 48KB

Control Information

8CYN = 5760KB

Ext Volume capacity

is 12582912[LBA]

1 cylinder = [(15 tracks) x (48KB)] = 720KB

720KB x 8 cylinders = 5760KB

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esxp actual capacity available 4 of 4
ESXP – Actual Capacity Available (4 of 4)

Type 3: External volume is smaller than Basic Capacity of the Specified LDEV emulation

When an open emulation other than OPEN-V is mapped to the XP12000, and the mapped emulation is not OPEN-V, an area will need to be assigned in the external volume for control data. This will result in the external volume being smaller

OPEN-3

3338 CYN

2403360 KB

(2461040640 bytes)

OPEN-3-CVS

OPEN-3

OPEN-3-CVS

2905 CYN

2091600 KB

Control Information

8CYN = 5760KB

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esxp setup overview
ESXP – setup overview
  • Step 1—Prepare the external subsystem for use by ESXP
  • Step 2—Preparing XP12000 Ports
  • Step 3—Connect Fibre cables from the external subsystems to the external ports on the XP12000
  • Step 4—Mapping an external volume (LU)
  • Step 5—Define the HOST path (Open volumes only)

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external storage gui
External Storage GUI

LU List

WWN of external array

LU Tree

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step 1 preparing external storage
Step 1—Preparing External Storage
  • From the perspective of the attached external subsystem, the XP12000 will appear to be a Windows HOST
  • Define LUNs to the external subsystem ports that will be attached to the XP12000
  • If the connection runs through a switch, set up Security for each port to ensure no other entity in the SAN can access the LUNs that are assigned for use to the XP
  • If an XP is being used as the external device, besure the HOST mode = 0C

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step 2 preparing xp12000 ports
Step 2—Preparing XP12000 Ports
  • No paths (LDEV assignments can exist on the port). If a path exists, it cannot be changed
  • Ports defined for Remote Copy (RCU target/initiator) or for other features cannot be defined
  • When defining an XP12000 port to be an External port, two ports will be changed at a time; for example, if CL1-A is changed, then CL5-A will also become an external port (based on MP responsibility)

Ports that will be used for external storage management need to be defined as an external port. An external subsystem cannot be connected to a port that is not an external port

NOTE: Only Open Fibre ports can be used

as an external port (FICON cannot be used).

Target

External Port(s)

1A & 2A

XP12000

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step 2 preparing xp12000 ports1
Step 2—Preparing XP12000 Ports

Select “Change to External”

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step 3 connect xp12000 and external subsystem
Step 3 - Connect XP12000 and external subsystem
  • Connect Fibre cables from the external subsystems to the external ports on the XP12000

SWITCH

SWITCH

Target

External Port(s)

1A & 2A

The switch is optional

External Storage

XP12000

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step 4 mapping an external lu as an internal lu 1 of 4
Step 4—Mapping an External LU as an Internal LU (1 of 4)

1. Select LU Operation

3. Click “Add LU”

2. Select External Port

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mapping an external lu as an internal lu 2 of 4
Mapping an External LU as an Internal LU (2 of 4)

5. Select CU#

6. Map LUs

4. Set Ext Grp and emulation type

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mapping an external lu as an internal lu 3 of 4
Mapping an External LU as an Internal LU (3 of 4)
  • IO Suppression ModeDISABLE = E-LUNENABLE = FlexCopy
  • Cache ModeENABLE = cache is used (for E-LUNs default)DISABLE = automatically set for FlexCopy
  • Attributes apply to all LDEVs generated from external space
  • Attributes cannot be changed ONLINE, requires DELETE and ADD LUprocedure 2 changes & not with data on external storage
  • The mapped volumes that have different external volume attributes cannot be used to create one LUSE volume.

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external storage xp operational notes 1 of 8
External Storage XP—operational notes (1 of 8)
  • Note 1—Do not create LUSE volumes that extend across two external LUs. Only create LUSE volumes across internally mapped LDEVs that span a single external LU
  • Note 2—If an external volume is greater than 2TB, it can still be mapped to the XP12000, but only the first 2TB of space will be available for use. Anything beyond the first 2TB will be inaccessible
  • Note 3—When using an external volume for HOST access, set the I/O Suppression mode to Disable when performing the ADD LU function
  • Note 4—When mapping an external volume for use with FlexCopy, set the I/O Suppression mode to Enable (which will automatically disable the Cache mode) when performing the ADD LU function. Remember that only the OPEN-V emulation can be used for volumes be set up for use in FlexCopy
  • Note 5—When I/O Suppression is set to Disable (signifying this volume will be used for HOST access, two paths should be defined to the external storage (use of different clusters is recommended)

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external storage xp operational notes 2 of 8
External Storage XP—operational notes (2 of 8)
  • Note 6—When I/O Suppression Mode is set to Enable for an external volume (FlexCopy), then the system will allow you to define only a single path, even though more than one is recommended; however, remember that
    • With only a single path means a failure will result in an inability to use the external device
    • An online µcode upgrade cannot be performed
  • Note 7—The XP12000 does not issue a reserve to the mapped external volumes in the external storage device regardless of whether the I/O Suppression mode is set to Enable or Disable
    • Do not write to an external volume directly from a HOST to the external device itself
    • There is no direct protection against this, so it must be considered when setting up the configuration for the volumes in the external device
    • (If the volume is used for FlexCopy, it can be accessed by the HOST; however, accesses attempted by the HOST during the actual copy process can result in HP’s inability to guarantee the consistency of the data)

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external storage xp operational notes 3 of 8
External Storage XP—operational notes (3 of 8)
  • Note 8—The same attributes that have been set for the external volume within its own subsystem (e.g. port security, LUN Security, LDEV Guard attribute, etc.) is not extended to the XP12000. On mapping the external volumes to a Target port for HOST use, the appropriate settings must be on the XP12000 port as well
  • Note 9—When an OPEN-x emulation is selected for the emulation type during the ADD LU operation, a format of the device is not necessary. The LDEV will be immediately available after the ADD LU operation is complete
  • Note 10—If an M/F emulation is selected during the ADD LU process, the volume(s) will be blocked upon the completion of the ADD LU process. The user will then have to format the volumes using the CVS screen to add the needed VTOC to the volumes
  • Note 11—After you have defined the external volume attributes during the ADD LU process (I/O Suppression mode and Cache mode), the attributes cannot be changed while the volume remains mapped. To change them, the volume must first be deleted (delete LU) and then re-added with the desired attributes

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external storage xp operational notes 4 of 8
External Storage XP—operational notes (4 of 8)
  • Note 12—All E-LUNs created from the same external volume will have the same attributes (I/O Suppression and Cache modes). This will remain true for any E-LUNs that are used in the CVS function
  • Note 13—A LUSE volume cannot consist of E-LUNs containing different attributes. Note that this statement is a culmination of what is defined in Notes 1 & 12
  • Note 14—When I/O Suppression mode is set to Enable for an external volume, the E-LUN cannot be used with the CacheLUN feature (note that this is because the Cache mode will have automatically been set to Disable)
  • Note 15—When the Cache mode is set to Disable, the E-LUN cannot be used in CacheLUN’s BIND mode
  • Note 16—When I/O Suppression Mode is set to Enable, the E-LUN cannot be paired using Continuous Access or Business Copy, nor can it be migrated using the AutoLUN feature

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external storage xp operational notes 5 of 8
External Storage XP—operational notes (5 of 8)
  • Note 17
  • Turning OFF the XP12000 when external storage is attached
    • Stop I/O to the mapped external devices
    • Perform the Disconnect Subsystem function in the ESXP panel for all external subsystems attached to the XP12000. This will force a destage of all write data before reporting the process has completed
      • Besides forcing a destage of the data, this will also inhibit additional writes to the external volumes
    • Perform any other steps necessary on the subsystem to power down the XP12000
    • Perform a normal Power Off of the system using the CE Panel switch

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external storage xp operational notes 6 of 8
External Storage XP—operational notes (6 of 8)
  • Note 18
  • Turning ON the XP12000 when external storage is attached
    • Power on any external storage which has volumes that are mapped on the XP12000
    • Power on the XP12000
    • Perform the Check Paths in the EXSP display of the Web Console or Command View

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external storage xp operational notes 7 of 8
External Storage XP–operational notes (7 of 8)
  • Note 19
  • Turning OFF external storage attached to the XP12000
    • Stop I/O to the mapped external devices
    • Perform the Disconnect Subsystem function in the ESXP panel for all external subsystems attached to the XP12000
        • This will force a destage of all write data before reporting the process has completed
        • This will also inhibit additional writes to the external volumes
    • Perform any other steps necessary on the subsystem to power down the external subsystem
    • Power off the external subsystem

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external storage xp operational notes 8 of 8
External Storage XP—operational notes (8 of 8)
  • Note 20
  • Turning ON external storage attached to the XP12000
    • Power on the external storage subsystem
    • Perform the Check Paths in the EXSP display of the Web Console or Command View
  • Note 21

When you must power ON or OFF both the XP12000 and the external storage at the same time, remember that the external subsystem is the LAST to power OFF, and the FIRST to power ON

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slide44

Learning

check

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slide45

Lab

activity

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