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September 10th, 2015 19:00

The requirements of Gatekeeper device in Solutions Enabler control host for SRDF

The requirements of Gatekeeper device in Solutions Enabler control host for SRDF

Introduction

This article describes few common errors caused by lack of Symmetrix Gatekeeper (GK) device in Solutions Enabler control host and provides the recommendation of the number of GK devices for SRDF.

Detailed Information

Solutions Enabler is an EMC software component used to control the storage features of Symmetrix arrays. It receives user requests via CLI, GUI, or other means, and generates system commands that are transmitted to the Symmetrix array for action. Gatekeeper devices are LUNs that act as the target of command requests to Enginuity-based functionality. These commands arrive in the form of disk I/O requests. As more commands are issued in parallel from the host, and as the commands grow in complexity, more gatekeepers will be required to handle the commands in a timely manner.

In SRDF environment, if there are insufficient number of GK devices. Usually, following errors occur in host, storage and Solutions Enabler control hosts:

1. 1.Randomly SC_DISK_ERR4 temporary disk operation errors occur on multiple volumes and Fibre Channels, SENSE DATA is 0102.

LABEL: SC_DISK_ERR4

IDENTIFIER: DCB47997

Date/Time: Mon Aug 13 03:48:20 BEIST 2012

Sequence Number: 8228

Machine Id: 00C1F2264C00

Node Id: xxx_xxx_xxx

Class: H

Type: TEMP

Resource Name: hdisk20

Resource Class: disk

Resource Type: SYMM_RAID1

Location:

U5877.001.0081712-P1-C2-T1-W5006048452A9BC99-L157000000000000

VPD:

Manufacturer................EMC

Machine Type and Model......SYMMETRIX

ROS Level and ID............5773

Serial Number...............74690260

Part Number.................000000000000610019000290

EC Level....................105074

LIC Node VPD................0690

Device Specific.(Z0)........04

Device Specific.(Z1)........61

Device Specific.(Z2)........000000300D9C09000260019C

Device Specific.(Z3)........12000000

Device Specific.(Z4)........54120CE4

Device Specific.(Z5)........FF80

Device Specific.(Z6)........45

Description

DISK OPERATION ERROR

Probable Causes

MEDIA

DASD DEVICE

User Causes

MEDIA DEFECTIVE

Recommended Actions

FOR REMOVABLE MEDIA, CHANGE MEDIA AND RETRY

PERFORM PROBLEM DETERMINATION PROCEDURES

Failure Causes

MEDIA

DISK DRIVE

RecommendedActions

FOR REMOVABLE MEDIA, CHANGE MEDIA AND RETRY

PERFORM PROBLEM DETERMINATION PROCEDURES

Detail Data

PATH ID

0

SENSE DATA

0A00 2A00 020C 8730 0000 0804 0000 0000 0000 0000 0000 0000 0102 0000 0000 0B00

0000 000A 0000 0000 4400 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000

0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000

0000 0000 0000 0002 78AA 0004 4580 0000 0000 0000 0000 0000 0000 0000 0083 0000

0000 0030 001D

2. Error 503E.02 (rejected write to local consistent group) appears from Symmetrix array internally, Severity is Informational.

3. GK errors occur in SRDF Solutions Enabler host.

EMC:SYMREPLICATE

emcSymRealSimplePing PSCaccessok (182_03) sts: Unknown code:

0xffffc55b, Order17: None, gk: /dev/pooled, sid: 000290105074

returning SYMAPI_C_FAILED_LOCAL_SYM_PING

EMC:SYMREPLICATE

User Generated A non-recoverable RDF 'INCREMENTAL

ESTABLISH' operation has failed: The gatekeeper device (while using the Base

Daemon) has an error (Please see the Log file)

4. If it’s in SRDF/AR environment, replication may be interrupted.

The requirements of GK devices on Solutions Enabler SRDF Hosts are shown below:

Solution enabler 7.0: 20 + [# of Consistency Group] * 0.5
Solution enabler 7.1: 6 + [# of Consistency Group] * 0.5
Solution enabler 7.2 and above: 6 + [# of Consistency Group] * 0.3

Author: Fenglin Li

iEMC APJ

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