HP 3PAR CRC errors in correlation with Brocade SAN

HP 3PAR CRC errors and Invalid transmission word in correlation with Brocade SAN switches

The advantage of HP 3PAR is hidden in monitoring mechanism. One of them is especially useful in case we do not have any special monitoring within our SAN. Thanks to that, we have opportunity to detect possible issue, before it will affect substantially our environment.

3par showhost -lesb

Intermittent CRC Errors Detected

Let’s take a look how HP 3PAR can present such an information to us. First example comes from HP 3PAR Service Processor Onsite Customer Care (SPOCC).

Event type: evt_host_port_crc_errors			     
ID: 30003
Component: Port 3:1:3
Short Dsc: Host Port 3:1:3 experienced over 50 CRC errors (50) in 24 hours Event String: Host Port 3:1:3 experienced over 50 CRC errors (50) in 24 hours
...
Event String: Port 3:1:3 Degraded (Intermittent CRC Errors Detected {0x2})

Same thing can be checked on HP 3PAR system itself. Just look at the event log.

3PAR-cluster cli% shoeventlog -oneline -startt 1/1/16
2016-01-01 12:33:18 GMT        2 Minor           FC LESB Error   sw_port:2:3:2 FC LESB Error Port ID [2:3:2]-Counters: (Invalid transmission word) (Invalid CRC) -ALPAs:  140700
2016-01-01 12:44:19 GMT        2 Minor           FC LESB Error   sw_port:3:1:3 FC LESB Error Port ID [3:1:3]-Counters: (Invalid transmission word)-ALPAs:  140700

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HP 3PAR disk replacement

HP 3PAR disk replacement. How to deal with failed drive on 3PAR

This article treats of disk replacement on 3PAR for administrators who want to know a little more about the background of disk replacement.

3PAR logical layer

With telling about disk replacement on 3PAR, the logical layer cannot be omited, as this is the fundamental concern around hard drive replacement procedure on 3PAR. The logical layer of 3PAR consist few levels. In overall the structure is not complicated, starting with physical disk and ending on Virtual Volumes.

physical disks (PD) → logical disks (LD) → Common Provisioning Groups (CPGs) → Virtual Volumes (VV)

Physical disks are divided into chunklets, starting with 7000 series, we are talking about 1GB fixed size of chunklets. Then 3PAR is using chunklets to build LDs. This all happen without any administrator involvement. Chunklet is the basic logic unit in 3PAR terminology.  Thanks to this approach, we are receiving nicely virtualized storage, with virtual RAID approach, which gives a lot of more flexibility, also in terms of redundancy. From the other hand, while some blocks within specific chunklet are unreadable, then the whole chunklet (1GB) is marked as failed.
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HP 3PAR 7200 Simulator

Deploying HP 3PAR 7200 Simulator with Windows Server 2012 in VMware Workstation as a part of Virtual LAB environment.

This article is about building/expanding lab environment about HP 3PAR clustered simulator with Windows 2012 Server with Active Directory and DNS server.

Prerequisites for HP 3PAR Simulator Lab

HP 3PAR Simulator for VMware Workstation

Below notes about features and requirements are coming from document HP3PAR StoreServ Simulator Version 3.2.1 MU2 (June 2015) – HP_3PAR_Simulator_Release_Notes_v3.2.1_Z7550-96179.pdf

  • Supported FeaturesThe following 3PAR StoreServ Storage System features are supported:
    • Up to 48 HDDs, 4 cage configuration
    • Cage types – DCN1, DCS1, DCS2
    • Disk types – FC, SSD, NL
    • 3PAR Management Console support
    • CLI and Remote CLI support
    • CIM-API (SMI-S) and WS-API support
    • Storage Provisioning including Thin-Provisioning
    • Exporting Virtual Volumes
    • Adaptive Optimization (AO)
    • Dynamic Optimization (DO)
    • Local Replication (Snapshot)
    • Remote Replication (RCIP) – requires 2 instances of the simulator ( Requires more resources )

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