Deleting a StorEdge 6920 Snapshot Volume May Render the Primary Volume Inaccessible

Asset ID:	1-77-1000678.1
Update Date:	2011-03-04
Keywords:

Solution Type Sun Alert Sure

Solution 1000678.1 : Deleting a StorEdge 6920 Snapshot Volume May Render the Primary Volume Inaccessible

Related Items


Sun Storage 6920 System

Related Categories


GCS>Sun Microsystems>Sun Alert>Criteria Category>Availability
 GCS>Sun Microsystems>Sun Alert>Release Phase>Resolved

PreviouslyPublishedAs
200890

Product
Sun StorageTek 6920 System

Bug Id
<SUNBUG: 6273019>

Date of Workaround Release
29-AUG-2005

Date of Resolved Release
20-OCT-2005

Impact

When a snapshot volume is deleted from the Data Services Platform (DSP-1000) component of the Sun StorEdge (SE) 6920 array, the primary volume may become inaccessible.

Contributing Factors

This issue can occur on the following platforms:

Sun StorEdge 6920 with Data Services Platform (DSP) 1000 firmware version 2.0.4 or 2.0.5

Symptoms

The primary volume will be unavailable to the host. This condition can be seen by running the format(1M) command, which will show the corresponding disk as inaccessible, as in the following example:

before deletion of the snapshot volume:

    # format
    Searching for disks...done
    AVAILABLE DISK SELECTIONS:
    0. c1t0d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107>
    /pci@8,600000/SUNW,qlc@4/fp@0,0/ssd@w210000203784453e,0
    1. c1t1d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107>
    /pci@8,600000/SUNW,qlc@4/fp@0,0/ssd@w21000020378423ce,0
    2. c9t600015D0000246000000000000000F0Dd0 <SUN-SE6920-0201 cyl 1278 alt 2 hd 32 sec 512>
              /scsi_vhci/ssd@g600015d0000246000000000000000f0d

after deletion of the snapshot volume:

    # format
    Searching for disks...done
    AVAILABLE DISK SELECTIONS:
    0. c1t0d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107>
    /pci@8,600000/SUNW,qlc@4/fp@0,0/ssd@w210000203784453e,0
    1. c1t1d0 <SUN36G cyl 24620 alt 2 hd 27 sec 107>
    /pci@8,600000/SUNW,qlc@4/fp@0,0/ssd@w21000020378423ce,0
    2. c9t600015D0000246000000000000000F0Dd0 <drive type unknown>
    /scsi_vhci/ssd@g600015d0000246000000000000000f0d

Workaround

Access to the volume can be restored by unmapping and remapping the DSP volume to the host, as in the following example:

    # ./sscs unmap -S testdomain -i s4u-280ra-HBA0 volume volsource
    # ./sscs map -P readwrite -i s4u-280ra-HBA0 -S testdomain volume volsource

(In the example above, the volume is "volsource," mapped to the host s4u-280ra-HBA0)

Resolution

This issue is resolved on the following platform:

Sun StorEdge 6920 with Data Services Platform (DSP) 1000 firmware version 2.0.6 or later

For more information on all 6920 procedures and using the sscs(1M) commands, please see the "Sun StorEdge System Getting Started Guide" at http://docs.sun.com/app/docs?q=sscs and the "Sun StorEdge System 6920 Release Notes" at http://www.sun.com/products-n-solutions/hardware/docs/pdf/817-5229-14.pdf.

Modification History
Date: 20-OCT-2005

20-Oct-2005:

Updated Resolution section, re-release as Resolved

Previously Published As
101898
Internal Comments

Internal Contributor/submitter
bala.devaraj@sun.com

Internal Eng Business Unit Group
NWS (Network Storage)

Internal Eng Responsible Engineer
heeman.lee@sun.com

Internal Services Knowledge Engineer
david.mariotto@sun.com

Internal Escalation ID
1-9619015

Internal Sun Alert Kasp Legacy ID
101898

Internal Sun Alert & FAB Admin Info
Critical Category: Availability ==> HA-Failure
Significant Change Date: 2005-08-29, 2005-10-20
Avoidance: Upgrade, Workaround
Responsible Manager: peter.s.thompson@sun.com
Original Admin Info: [WF 20-Oct-2005, Dave M: upgrade released, sending for rerelease]
[WF 29-Aug-2005, Dave M: review complete, sending for release]
[WF 26-Aug-2005, Dave M: sending for tech review]
[WF 23-Aug-2005, Dave M: draft created]

Product_uuid
67794720-356d-11d7-8ef2-ce2ac2bc9136|Sun StorageTek 6920 System

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