StorEdge[TM] 99x0 Shadow Image and TrueCopy: Volume Statuses Explained

Asset ID:	1-71-1018574.1
Update Date:	2012-07-30
Keywords:

Solution Type Technical Instruction Sure

Solution 1018574.1 : StorEdge[TM] 99x0 Shadow Image and TrueCopy: Volume Statuses Explained

Applies to:

Sun Storage 9985 System - Version: Not Applicable and later   [Release: N/A and later ]
Sun Storage 9985V System - Version: Not Applicable and later    [Release: N/A and later]
Sun Storage 9990 System - Version: Not Applicable and later    [Release: N/A and later]
Sun Storage 9990V System - Version: Not Applicable and later    [Release: N/A and later]
All Platforms

Goal

This document will explain the states that can be seen in Shadow Image, CCI and TrueCopy configurations. It will include what these states mean, volume permissions in each state and some examples of how to transition from one state to another.

Solution

State	TrueCopy	ShadowImage	PVOL permissions	SVOL permissions
SMPL	Unpaired volume	Unpaired volume	Read/Write	Read/Write
PAIR	Paired volume. Initial copy is complete. Updates are processed synchronously or asynchronously	Paired volume. Initial copy is complete. Updates are processed asynchronously	Read/Write	Read only
COPY	In paired state, but initial copy, pairsplit, or resync operation is not complete. Includes COPY(PD), COPY(SP) and COPY(RS) statuses below.	In paired state, but initial copy, pairsplit, or resync operation is not complete. Includes COPY(PD), COPY(SP) and COPY(RS) statuses below.	Read/Write	Read only
COPY(PD) (pending duplex)		Initial copy in progress.	Read/Write	Read only
COPY(SP) (split pending)		When steady split mode is used for pairsplit. All pvol updates prior to pairsplit command are copied. When updates are complete, pvol and svol are identical to the pvol when split was issued.	Read/Write	Read only
COPY(RS) (resync)		When a split pair is resynchronized in normal mode, only the Pvol differential data is copied to the Svol. When PSUE pair is resync'd, the entire Pvol is copied to the Svol.	Read/Write	Read only
COPY(RS-R) (resync-reverse)		When a split pair is resynchronized in reverse or quick restore mode (only the Svol differential data is copied to the Pvol).	Read only	Read only
RCPY (reverse copy)		In paired state, but reverse resync operation is in progress.	Read only	Read only
PSUS (split)	In paired state, but updates to the Svol data are suspended due to user-requested pairsplit. The 99x0 keeps track of Pvol and Svol updates while the pair is split.	In paired state, but updates to the Svol data are suspended due to user-requested pairsplit. The 99x0 keeps track of Pvol and Svol updates while the pair is split to allow for a faster resync.	Read/Write	Read only Read/Write when using write enable pairsplit option.
PSUS(SP) (quick split pending)		Means quick split mode is selected. Only pvol differential data is copied to the svol in the background. Pairs in this state cannot be deleted	Read/Write	Read/Write
PSUE or PFUS (suspended)	In paired state, but updates to the Svol data are suspended due to an error condition. The volumes in this condition are not synchronized. PSUE is PSUS with due to an error condition. PFUS is PSUS with reason of sidefile full.	In paired state, but updates to the Svol data are suspended due to an error condition. When a PSUE pair is resynced, the 99x0 copies the entire Pvol to the Svol (same as initial copy). The volumes in this condition are not synchronized.	Read/Write if no error occurs in the pvol	Read only
PDUB	Used for TrueCopy LUSE pairs only. In paired state, but updates to one or more ldevs within the LUSE pair is SMPL or PSUE (due to some error condition).		Read/Write if no error occurs in the pvol	Read only

Command examples to transition between the states above:

Current State	Desired State	CCI Command	*Operation in Storage Navigator (9900V) 1 or Remote Console (9900) 2*	Transitional State
SMPL	PAIR	paircreate	Paircreate -Sync or Async for TrueCopy	COPY(PD)
PAIR	PSUS	pairsplit	Pairsplit Pairsplit-r (TrueCopy)	COPY(SP) or PSUS(SP)
PAIR	PSUE	pairsplit -E	Pairsplit-E *3
PAIR	SMPL	Pairsplit -S	Pairsplit-S
PSUS or PSUE	PAIR	pairesync	Pairresync	COPY (RS)

*1 Right click on the selected LU(s)/pair(s) in the TrueCopy 'Pair Operations' tab or the Shadow Image 'Main' tab to see the available operations.

*2 Select the Shadow Image or TrueCopy option from the RMC main window. The available operations will be seen as buttons on the right hand side of the window.

*3 The -E option is for Shadow Image only and is not normally used.

Product
Sun StorageTek 9900 ShadowImage In-System Replication
Sun StorageTek 9900 TrueCopy

shadow image, cci, 9910, 9960, 9970, 9980, hitachi, pvol, svol, p-vol, s-vol, pair, psus, psue, pdub, pfus, rcpy, smpl, paircreate, pairsplit, pairresync, copy, shadowimage, trucopy, truecopy, true copy
Previously Published As
78330

Change History
Date: 2010-04-29
User Name: eh47940
Action: consisteny tittle, object:defects

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