Seagate ST318404LC Podręcznik Użytkownika Pobierz pdf (Strona 27)

Dell Compellent Confidential HP-UX Best Practices 11i v2 and 11i v1

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Data Instant Replay (Continuous Snapshots)

It is often required in an enterprise environment to freeze and capture the state of a data set at a

specific point in time; there are many and various reasons that this is needed, including but not limited

to data backups, configuration snapshots prior to system upgrades etc. On the Dell Compellent Storage

Center products, this facility and ability to capture snapshots is known as “Data Instant Replay” or

“replay/s” for short. We will be using the term “replay” for brevity in this section and further

discussion.

Prior to capturing a replay, it is recommended that the data set be put into a known and consistent

state. This often and typically means that any writes to the data set (both buffered and direct) are

flushed and the data set is frozen for the duration when the replay is captured. This is often known in

the technical realm as “quiesceing” the data. For the sake of simplicity, we will be recreating a

Volume Group named “vgdemo” with a single 100g LUN from the Dell Compellent Storage Center and a

single 50g Logical Volume therefrom. The Volume Group and mounted filesystem looks as follow.

Type: vgdisplay –v vgdemo

--- Volume groups ---

VG Name /dev/vgdemo

VG Write Access read/write

VG Status available

Max LV 255

Cur LV 1

Open LV 1

Max PV 16

Cur PV 1

Act PV 1

Max PE per PV 6399

VGDA 2

PE Size (Mbytes) 16

Total PE 6399

Alloc PE 3125

Free PE 3274

Total PVG 0

Total Spare PVs 0

Total Spare PVs in use 0

--- Logical volumes ---

LV Name /dev/vgdemo/lvol1

LV Status available/syncd

LV Size (Mbytes) 50000

Current LE 3125

Allocated PE 3125

Used PV 1

--- Physical volumes ---

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 66 67

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