DataDomain

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Infos

Pre-Comp = Data written before compression             
Post-Comp = Storage used after compression             
Global-Comp Factor = Pre-Comp / (Size after de-dupe)   
Local-Comp Factor = (Size after de-dupe) / Post-Comp   
Total-Comp Factor = Pre-Comp / Post-Comp               
Reduction % = ((Pre-Comp - Post-Comp) / Pre-Comp) * 100

FAQ

Wichtigster Befehl!

system show droid

Web GUI funktioniert nicht

Meldung im WebGUI:

• Service not available*

adminaccess disable http
adminaccess disable https
.
adminaccess enable http
adminaccess enable https

noch ca 2-5min warten bis es wieder funktioniert.

System Stats auslesen

This command displays a quick look at real-time statistics for key system areas, including: CPU, NFS and CIFS protocols, network traffic, disk read and write rates and replication statistics. This is a good way to measure raw throughput on the storage system

system show stats int 2

The next command to show Data Domain Boost statistics in real time.

ddboost show stats int 2

File Transfer ab DD

Um ein File ab einer DD zu kopieren gehe wie folgt vor:

• logge dich mit dem CLI auf der DataDomain ein

system  show serialno
priv set se
se ls -slh /ddvar/core/
SE@hddeh3## se ls -slh /ddvar/core/
total 15G
4.0K -rw-r--r--  1 root admin 3.7K May  2 03:13 ddfs-kernel-20160502-03.10.out
4.0K -rw-r--r--  1 root admin 3.5K May  4 03:38 ddfs-kernel-20160504-03.38.out
4.0K -rw-r--r--  1 root admin 3.7K May  5 03:17 ddfs-kernel-20160505-03.14.out
4.0K -rw-r--r--  1 root admin 3.5K Jul  6 03:10 ddfs-kernel-20160706-03.10.out
4.0K -rw-r--r--  1 root admin 3.5K Jul 19 00:48 ddfs-kernel-20160719-00.48.out
 15G -rw-r--r--  1 root admin  15G Jul 19 01:29 ddfs.core.4214.1468882157.gz
548K -rw-r--r--  1 root admin 541K Apr 27 03:16 ddfs.mini.10007-20160427-03.16.26.log
544K -rw-r--r--  1 root admin 540K Apr 29 03:22 ddfs.mini.22194-20160429-03.22.23.log
500K -rw-r--r--  1 root admin 495K May  4 03:39 ddfs.mini.25270-20160504-03.38.55.log
612K -rw-r--r--  1 root admin 605K Jul  6 03:10 ddfs.mini.29666-20160706-03.10.29.log
500K -rw-r--r--  1 root admin 493K Jul 19 00:49 ddfs.mini.4214-20160719-00.48.55.log
532K -rw-r--r--  1 root admin 526K May  2 03:11 ddfs.mini.5287-20160502-03.10.45.log
480K -rw-r--r--  1 root admin 475K May  5 03:15 ddfs.mini.8298-20160505-03.14.54.log
   0 -rw-r--r--  1 root admin    0 May  2 03:18 invoke_savecore.log
SE@hddeh3##

• logge dich auf dem Targetlinuxserver ein

scp sysadmin@[DataDomain]://[PFAD/DATEI]
z.B.:
scp sysadmin@hddeh3://ddvar/core/ddfs.core.4214.1468882157.gz .

• Falls nötig, kann nun vom Targetserver die Datei via WinSCP weg kopiert werden

fail in to a "limited session" mode

Error sieht etwa so aus

neuenschwank@hnix1a:~> ssh sysadmin@hddca2
Data Domain OS
Password:
X11 forwarding request failed on channel 0
Last login: Sat Feb 6 14:05:47 CET 2016 from 172.21.42.217 on gui

**
** NOTICE: You are logged in. However not all services are initialized.
** Some commands may fail. Re-login later for full functionality.
** Do you wish to continue with limited session functionality? (yes|no) [no]: yes


Welcome to Data Domain OS 5.7.0.4-513368
----------------------------------------
(limited session) #
(limited session) #
(limited session) #
(limited session) #
(limited session) # disk show state
**** Error retrieving information (**** Error communicating with management service.).
(limited session) #

The error communicating with management service alert is caused by the SMS service being in a hung state. It typically appears to happen randomly after DD OS upgrades. The resolution is to manually restart this service. Please could you try and run the following commands over a cli session?

#system show serialno
#priv set se
#se sms restart

(This will restart SMS)

Filesystem commands and the Management Service should now work without issue.

Hostname ändern

net set hostname

Dazu müssen nachher noch zwei Sachen geändert werden.

• In der DDMC muss das alte Zertifikat geändert werden.

adminaccess trust show 
adminaccess trust del host hddxx1.pnet.ch 
adminaccess trust add host hddxx2.pnet.ch 

• Die Replikationen (falls vorhanden) müssen auf den neuen Hostname geändert werden.Auf dem Source Host und auf dem Destination Host ausführen:

replication show config all
replication disable mtree://hddxx1.pnet.ch/data/col1/zf2_sql_bak 
replication modify mtree://hddxx1.pnet.ch/data/col1/zf2_er2_img_repli destination-host hddxx2.pnet.ch 
replication enable mtree://hddxx2.pnet.ch/data/col1/zf2_er2_img_repli

Compression type

DDOS currenty supports four different compression types with varying levels of compression CPU load.

type        expected-comp  CPU-load
----------  -------------  --------    
none        1x             0x
lz(default) 2x             1x
gzfast      2.5x           2x
gz          3x             5x

For example, the gz compression algorithm gives about 3x local compression but uses about 5x more CPU to run the compression part of the code than lz.

Note that the expected compression figures can vary greatly based on the data type. For some data types, gz may only be 10% better than lz while for other data types, it is 2x or more better than lz.In general, files with lots of similar strings of data tend to compression better with gz than lz. Examples of such data sets are:

• Database files.
• Log files.

Consequences of using gz:

Since the stronger compression algorithms use more CPU, they can have significant performance consequences:

Use the following commands to change the compression type:

# filesys disable
# filesys option set local-compression-type {none | lz | gzfast | gz}
# filesys enable

Warning: Prior to changing the local compression type, the file system must be shut down. It can then be restarted immediately after the compression option has been set. This is necessary due to Bug 66582.Once the compression type is changed, all new writes will use the new compression type and any data already written will be converted to the new compression type during cleaning. As a result, the first clean after changing the compression type may take a much longer time to run.

181558 : Identifying Data Types That Cause Poor Compression

https://support.emc.com/kb/181558

MissingDiskPath - Error: EVT-MPATH-00005

The workaround is to do disk port disable and disk port enable to reset HBA.# If the drive is reporting "hardware access error" or 'failed" state, identify the active path the drive is on. At the Data Domain system prompt type

disk multipath status

Example Output:

      Disk Multipath Status
---------------------
Port Hops   Status    Disk                 
----   ----    -------   ---------------------
2a     1      Active       2.1 - 2.3, 2.5 - 2.16
       1      Failed       2.4*********** - Status shows a "failed" path     
       3      Standby   3.1 - 3.16           
       2      Active      4.1 - 4.8            
       2      Standby   4.9 - 4.16           

3b     3      Active       2.4*********** - Too many hops to access the disk
       3      Standby    2.1 - 2.3, 2.5 - 2.16
       1      Active       3.1 - 3.16           
       2      Active       4.9 - 4.16           
       2      Standby    4.1 - 4.8            
----   ----   -------   ---------------------

1. Disable the filesystem. Issue the command:

filesys disable

1. Go to SE Mode.# Disable the path with the failed drive. Issue the command:

disk port disable 

In the example above, path 2a should be disabled by running the command disk port disable 2a# Force I/O to the standby path. Run the command:

enclosure test topology  duration 

In the example above, the syntax would be enclosure test topology 3b duration 1# Verify the secondary path is now active. Run the command:

disk multipath status

1. Unfail the disk drive by running the command:

disk unfail 

1. Enable the failed path. Run the command:

disk port enable 

In the example above, the syntax would be disk port enable 2a# Verify the failed path is now active. Run the command:

disk multipath status

1. Return to step 4 and run the workaround on the other path if it is failed or not active# Verify the connection path alert cleared.# Exit SE Mode. Run the command:

priv set admin

1. Re-enable the filesystem:

filesys enable

Optional workaround:
Note: This option will require a system outage.
Reboot the system. A reboot will cause the system to recognize the drive paths when the RAID array is reassembled.

Fix: This issue will be fixed in future DD OS releases.

REFERENCE:
25.11.2013 https://community.emc.com/docs/DOC-30491
Document ID:86162