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April 21st, 2016 02:00

Summary for ATE You can ask anything about XtremIO

Summary for ATE

You can ask anything about XtremIO

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This is the quick summary for ATE event

Ask The Expert】エキスパートに聞こう!なんでもこいXtremIO

Detailed Information


Question 2:

About management network support for XtremIO

Answer 2:

NAT environment also supported network between XMS and Storage Controller.


Additional info :How to check network

*Can you ping from Client to storage controller?

if not ....check packet filter /port closure

Question 3:

Hardware issue in XMS server can be detected ?

Answer 3:

Internal drive issue can be detected. But XMS is online or not can only checked by ESRS heart beat every 30 sec via Gateway server (same as VNX CS and VMAX SP )

If there is no response from XMS server,the error ``Device Missing `` occurred and SR become Sev1.

Supported XtremIO configuration need to have ESRS.( In terms of maintenance policy)

Question 9:

XtremIO with Windows, VMware and XtremIO

Answer 9:

Good to have XtremIO Window VSS Provider and VSI for VMware vSphere Web Client for operational purpose.

VSS Hardware Provider

See detail on Host Configuration Guide.(

Useful for back up/restore operation.( Some cases are must tool)

VSI for VMware vSphere Web Client

Be able to use for function vSphere GUI can perform.( Creating Data store /Provisioning RDM/Action specific to XtremIO vol ) Recommended to install.

See VSI for Web Client Product Guide

Question 11:

Overhead of XtremIO against Deduplication

Answer 11:

There is no Performance impact (XtremIO cannot stop Dedup as it is always working inline, Also the more host has dedupdata, the more performance will be) 


1. Deduplication done inline. Duplicated data is not write to XtremIO,( Nor in chache/SSD )then returns ACK to host.

2.All X-Blick CPU are worked for IO operation evenly.

3. XtremIO will have All Meta data @ inmemory

All Other Flash array are usually have metadata in SSD so they cannot perform constant performance .

Performance chat for XtremIO (1:1NO duplication data 2:11/2 data is duplicated 10:19/10 data are duplicated)


Question 12:

XtremIO Performance if there is no deduplicated data

Answer 12:

Catalog spec per 1 XtremIO X-Brick

8KB Read:Write=70%:30% 150,000 IOPSRead 100%-> 250,000 IOPS


Data duplication radio (1:1)All data will be written to SSD

80% full in array physical capacity

Response time within 1ms

The more host has Duplicated data , XtremIO will have better performance

XtremIO will have stable performance ( not affected by Disk usage ,load etc ..) 


Question 18:

Pros and Cons about XtremIO data protection

Answer 18:

XtremIO Data Protection(XDP)

Detailed XDP Doc


High Availability

XDP protects 25 SSD with 23+2 ( raid 6 like double parity ).

Difference between RAID-6 is XDP has diagonally protection so that shorten the calculation time for rebuild.

Data Protection Group(DPG) supports up to 2 disk failure ( same as RAID 6 ) ).

Also high speed rebuilding allow another disk failure during rebuilding .6 SSD issue can be handled per DPG .

High performance

Overhead ( average upon write operation ) = 1.22

XDP stripe has 8kb data block ( 25 X28 ) and XDP is full stripe.

Related info>

Classical Raid overhead


(1 write need to have one Mirror , means total write block end up 2 . overhead 2 ÷ 1 2)

RAID-5-> 2

(One write need to have one parity 2 ÷ 1 2)


Question 21:

The reason for XtremIO has 30% extra effective capacity compare with other flash storage

Small over head on XDP capacity

Raid technology XtremIO ( 23+2 ) uses  less overhead  than normal RAID technology .

No dedicated space for Deduplication and compression ( XtremIO uses inline and in-memory operation )

No need for garbage collection space

Effective Capacity is 75% of physical capacity . (Remaining are for system/hot spare/XDP overhead  )

eg10TB model (400GB eMLC SSD x25)-> 7.587TB is Effective Capacity

Question 22:

Data migration to XtremeIO

Answer 22:

If source storage are VNX/VMAX, SAN COPY and Open Replicator can be used.

If Service can be off line, VPLEX also can be used(Not for VNX/VMAX).

Other options are Storage vMotion(vSphere)/Live Migration(MS Hyper-V)/PowerPath Migration Enabler etc .

Question 24:

Sizing for XtremIO

Answer 24:

XtremIO place data by 8 KB. Deduplication rate will be affected how much data duplicated contains per 8 KB.

So host system like virtual environment/VDI which has same OS size line up will have higher rate of deduplication.

Example of Data deduction rate >(deduplication & compression)( Based on actual data )

Database environment: 2-4 times

Virtual server :3-8 times

VDI ( full clone ) server :6-12 times 

Useful tool to calculate rate :

Question 25 :

MiTrend Calculation

Answer 25 :

1Install Data Analyzer tool into host and scan by volume

2result in output.mitrend

3Upload above file at then analysis report will generated in xcelor ppt

Scanned data deduction rate




Scanned data


Necessary Capacity


Data deduction rate


Data deduction from Deduplication and   Compression 

6.05 times

Data deduction from Deduplication

3.09 times

Data deduction from Compression

1.96 times

Data deduplcationrate


Above result shows source data 3.82 TB became 599 GB in xtremIO ( deduplication/thin provisioning /compression @ xtremIO )

Question 26 :

Sizing for VDI

Answer 26:

Linked Clone and full clone may not be same size due to deduplication.


Question 10:

Adding Hardware to XtremIO

Answer 10:

Brick expansion>

By who: OCE(Online Cluster Expansion) need to be performed by EMC Level 3 engineer.

Impact : Canbe done online.It may affect host performance during data reclamation.

Parameter/setting change : There is no specific change . New Brick storage controller IP only needed.

Question 14:

About multi Array management (Multiple cluster can be managed by One XMS server , Support from XtremIO 4.0~ )

Answer 14:

How to Creating new multiple cluster in one XMS server ?

Create Cluster using create-cluster cmd on XMS server by cluster

Adding new cluster to existing cluster environment or move some cluster into centralized XMS server >

Create new cluster @target XMS server  for new cluster ,

Delete cluster registration @ source XMS server then add cluster @ target cluster for existing cluster.

See XtremIO User Guide P.130 "Cluster Migration"

Question 19:

The reason for no performance tuning XtremIO .

Answer 19:

There is no cache concept as SSD build as single pool.

User only needs to decide Volume size /name because XtremIO using thin volume, All controller are active .Host can be the bottle neck ( see

Question 20:

Tuning opportunity for host /switch

Answer 20 :

Check Host Configuration Guide (   )

*Page 50 Concurrent full clone operation

*Page 53 VAAI X-Copy tuning


Question 1:

Can user chose specific vol-id upon volume creation?

Answer 1:

vol-id assigned as auto thus user cannot chose it Initiator or object within cluster are the same.

Volime identitification @ XtremIO

--Volume name and vol-id cannot be Same. XtremIO/XMS can check from Volume name or Vol-ID.

Question 4:

How to check XMS server internal drive.

Answer 4:

cmd: show-xms-info can be used for usage of CPU/RAM, and usage of Disk.

To check drive failure need to be detected from event or mail alert.

Question 5:

Reporting function for XtremIO ( v4.0~)

Answer 5:

v4.0.x~ Available reports listed below

Duration and granularity

Newest 5 sec to 3 days at oldestAfter 3 collect for 7 days

2 Years at Max ( Data will be deleted After 2 year=720 days )

Granularity Days

5 sec                       3 days

1 min                       7 days

10 min                    30 days

1 h                           90 days

1 day                       730 days ( 2 year )

Available Data




5 sec

3 days

1 min

7 days

10 min

30 days

1 h

90 days

1 day

730 days ( 2 year )

NotePrior to 4.0, Data can only back up to Up to 1 week ( every 5 sec )with XtremIO cluster basic info ( IOPS, Bandwidth, Latency)

Question 6:

How to Expert performance Data

Answer 6:


Eg)IOPS info every 5 sec ( granunarity=raw) from 23rd Feb 2016. Export to file name iops-cluster.csv

1. Access link for CSV file

2. run cmd ..

xmcli (tech)> show-reports-data category=IOPS entity=Cluster granularity=raw from-time="2016-02-23"


Exported query to https:// / xtremapp/iops_cluster.csv

xmcli (tech)>

Question 7:

Stop-cluster command

Answer 7:

Issuing stop-cluster command will stop access to XtremIO volume

Question 8:

About Event notification ( email,SNMP,syslog)

Answer 8:

Usually notifications are set to severity level Major or above.

See detailed thread :

Question 13:

How to set ESRS

Answer 13:

see below links,-4.0.1-and-4.0.2-Storage-Array-Site-Preparation-Guide.pdf?language=en_US 

333578 : XtremIO: How to Configure XtremIO with ESRS Virtual Edition (ESRS VE)

Question 15:


Answer 15 :

Same as XMS/SC software package and installation,But operation need to be done by EMC support engineer.

Question 17:

XtremIO SNMP v3 MIB download

Answer 17:

You can use v1,v2 MIB file as well. v3 has backward compatible.



How to stop XtremIO


below command

power-off cluster-id=Cluster


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