Resources

What is the Fan-out ratio for an FA port on a Symmetrix V-Max

Fan-out ratio is a measure of the number of hosts that can access a storage port at any given time.This topology allows customers to map multiple host HBA ports onto a single FA port.The term fan-out is used to describe the server:storage ratio, where a graphic representation of a n:1 logical topology looks like a hand-held fan, with the wide end toward n. By convention fan-out refers to the number of server ports that share a single storage port. Fan-out consolidates a large number of server ports on a fewer number of storage ports. A fan-out rate is often referred to as just the n part of the ratio; For example, a 16:1 fan-out is also called a fan-out rate of 16, in this case 16 server ports are sharing a single storage port.

How to find which devices are causing high write pendings

Poor performance on disks due to high write pending count

This command will give the write pending tracks for all devices:

DEVICE	Tracks/sec	% Dev
17:32:07	WP Tracks	Prefchd	Destgd	WPmax
17:32:07 0081 (Not Visible )	6	0	0	0
0083 (Not Visible )	1	0	0	0
0088 (Not Visible )	12	0	0	0
0089 (Not Visible )	3	0	0	0
008A (Not Visible )	6	0	0	0
008E (Not Visible )	3	0	0	0
008F (Not Visible )	3	0	0	0
0083 (Not Visible )	1	0	0	0
0090 (Not Visible )	17	0	0	0
0091 (Not Visible )	0	0	0	0
0092 (Not Visible )	0	0	0	0
0093 (Not Visible )	0	0	0	0
0094 (Not Visible )	0	0	0	0
0095 (Not Visible )	0	0	0	0
0096 (Not Visible )	6	0	0	0

If you want to look at only a device group, use the following command:

symstat -sid 0000 -g groupname -type MEMIO -i 5 -c 5

How to recover SRDF Link Failure

1. symrdf -g dgname disable (Disables consistency protection for SRDF/A pairs in device group)
2. symrdf -g dgname set mode acp_disk (This will turn on the adaptive copy write pending mode for the device group)
3. symrdf -g dgname est (This initiates an establish for all the SRDF pairs in the device group)
4. symrdf -g dgname query (To query a device Group)
   Wait until the invalid track count is under 30,000 tracks
5. symrdf -g dgname set mode async (Change the Copy mode to Asynchronous)
6. symrdf -g dgname enable (Enables consistency protection for SRDF/A pairs in device group)

SYMCLI Command Line Examples

In this example I will show you how to add new dynamic pairs to an existing device group in srdf. VMAX R1 Frame : 1344VMAX R2 Frame : 1719Device Group : njserver_dg Device Group (DG) Name : njserver_dg DG's Type : RDF1DG's Symmetrix ID : 000192601344 (Microcode Version: 5876)Remote Symmetrix…

To extend a Filesystem nas_fs -xtend testnfs size=500M pool=poolname Check/set speed and duplex server_sysconfig server_2 -pci cge0 -o duplex=full,speed=100 Configure server_3 to be a standby for server_2 (presuming server_3 is currently a primary data mover): server_standby server_2 -c mover=server_3 -policy=auto Confgure server_3 to be a primary data mover…

How will clients be affected during Data Mover failover

NFS Clients: NFS is a stateless protocol.A stateless server does not keeps state between connections.NFS version 3 is the standard for NFS and is the most stable and mature version of the NFS protocol. NFS clients will likely see a “NFS Server not responding” message when failover is underway. NFS operation will…

How to use Nested Mount File System (NMFS) in VNX

Example : $ nas_fs -name Root -type nmfs -create id = 306 name = Root acl = 0 in_use = False type = nmfs worm = off volume = 0 pool = rw_servers= ro_servers= …

SYMCLI Command Line Examples

In this example I will show you how to add new dynamic pairs to an existing device group in srdf. VMAX R1 Frame : 1344VMAX R2 Frame : 1719Device Group : njserver_dg Device Group (DG) Name : njserver_dg DG's Type : RDF1DG's Symmetrix ID : 000192601344 (Microcode Version: 5876)Remote Symmetrix…

Migrating CIFS shares from VNX to Isilon using emcopy

Here's the scenario : We have a cifs share named "cifsdata" residing on vnx-cs-180. The name of the cifs server is njcifs187 and its IP is 192.168.0.187 . Isilon smartconnect zone name is smartcluster. On the Isilon Cluster create a SMB share .When you create a share, select " Do Not…

Isilon CLI

Check OneFS Version isi version Check the Status isi status Check High Level Overview Of Usage isi status -d isi status -q Hardware Status isi_hw_status Array Wide commands With an Isilon cluster being made up of multiple nodes, you will occasionally want to run command on some or all…

Troubleshooting Isilon Performance Issues

Performance issues are typically caused by network traffic,network configuration issues, client or cluster processing load, or a combination thereof. This article describes several effective ways to troubleshoot performance issues. Symptoms Client computers perform slowly. Certain jobs, particularly those that run on the cluster, either fail or take longer than expected…

SYMCLI Command Line Examples

In this example I will show you how to add new dynamic pairs to an existing device group in srdf. VMAX R1 Frame : 1344VMAX R2 Frame : 1719Device Group : njserver_dg Device Group (DG) Name : njserver_dg DG's Type : RDF1DG's Symmetrix ID : 000192601344 (Microcode Version: 5876)Remote Symmetrix…

How to use the isi_vol_copy utility to migrate data from a NetApp filer to an Isilon cluster

The isi_vol_copy command line utility provides a mechanism for transferring data from a NetApp filer to an Isilon cluster. The information in this article applies to OneFS 6.5.5 3 and later. Details The isi_vol_copy utility copies directory trees from a NetApp filer to an Isilon cluster over a network using…