deduplication karşılaştırması - zfs vs. vdo

zfs ve vdo yu karşılaştırma zamanı geldi diyerek karşılaştırmaya karar verdim.

Testlerde kullanabileceğim iki tane IBM power8 sunucu üzerine, zfs için RHEL 7, vdo için RHEL 8 kurarak karşılaştırdım.

Sonuç olarak vdo daha az kaynak, neredeyse yarı yarıya, ve ~%3 daha iyi deduplication gerçekleştirdi. RHEL 8 geldiğinde arşivleme sistemleri için vdo yu kullanabiliriz görünüyor.

Tabi her şey deduplication değil. snapshot, replikasyon vs. gibi ihtiyaçlar varsa zfs öne çıkmaya devam edecek gibi görünüyor.  


Test sistemi hakkında;

[root@Rhel8onPower8 ~]# lsb_release -a
LSB Version:    :core-4.1-noarch:core-4.1-ppc64le:cxx-4.1-noarch:cxx-4.1-ppc64le:desktop-4.1-noarch:desktop-4.1-ppc64le:languages-4.1-noarch:languages-4.1-ppc64le:printing-4.1-noarch:printing-4.1-ppc64le
Distributor ID: RedHatEnterprise
Description:    Red Hat Enterprise Linux release 8.0 Beta (Ootpa)
Release:        8.0
Codename:       Ootpa


[root@Rhel8onPower8 ~]# uname -a
Linux Rhel8onPower8 4.18.0-32.el8.ppc64le #1 SMP Sat Oct 27 18:35:17 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux
[root@Rhel8onPower8 ~]#



[root@Rhel8onPower8 ~]# vdo printConfigFile
config: !Configuration
  vdos:
    vdoarsiv: !VDOService
      _operationState: finished
      ackThreads: 1
      activated: enabled
      bioRotationInterval: 64
      bioThreads: 4
      blockMapCacheSize: 128M
      blockMapPeriod: 16380
      compression: disabled
      cpuThreads: 2
      deduplication: enabled
      device: /dev/disk/by-id/dm-uuid-LVM-j8P9Uhbk5qFa5qYNCoQXvF5GQUyuQgAo6mXwjVUSakKfGix2UOYeLWGpku51YOwD
      hashZoneThreads: 1
      indexCfreq: 0
      indexMemory: 0.25
      indexSparse: disabled
      indexThreads: 0
      logicalBlockSize: 4096
      logicalSize: 30T
      logicalThreads: 1
      name: vdoarsiv
      physicalSize: 3T
      physicalThreads: 1
      readCache: disabled
      readCacheSize: 0M
      slabSize: 2G
      writePolicy: auto
  version: 538380551
filename: /etc/vdoconf.yml

[root@Rhel8onPower8 ~]#

[root@Rhel8onPower8 ~]# vdostats  --human-readable
Device                    Size      Used Available Use% Space saving%
/dev/mapper/vdoarsiv      3.0T    307.5G      2.7T  10%           77%
[root@Rhel8onPower8 ~]#

[root@Rhel8onPower8 ~]# yum info vdo
Updating Subscription Management repositories.
Last metadata expiration check: 0:41:53 ago on Tue 27 Nov 2018 11:59:03 PM EST.
Installed Packages
Name         : vdo
Version      : 6.2.0.239
Release      : 8.el8
Arch         : ppc64le
Size         : 5.0 M
Source       : vdo-6.2.0.239-8.el8.src.rpm
Repo         : @System
From repo    : localrepoBase
Summary      : Management tools for Virtual Data Optimizer
URL          : http://github.com/dm-vdo/vdo
License      : GPLv2
Description  : Virtual Data Optimizer (VDO) is a device mapper target that delivers
             : block-level deduplication, compression, and thin provisioning.
             :
             : This package provides the user-space management tools for VDO.

[root@Rhel8onPower8 ~]#



ZFSonLinux kurulu sistem;

[root@rhel7-on-s822l ~]# lsb_release
LSB Version:    :core-4.1-noarch:core-4.1-ppc64le:cxx-4.1-noarch:cxx-4.1-ppc64le:desktop-4.1-noarch:desktop-4.1-ppc64le:languages-4.1-noarch:languages-4.1-ppc64le:printing-4.1-noarch:printing-4.1-ppc64le
[root@rhel7-on-s822l ~]# lsb_release  -a
LSB Version:    :core-4.1-noarch:core-4.1-ppc64le:cxx-4.1-noarch:cxx-4.1-ppc64le:desktop-4.1-noarch:desktop-4.1-ppc64le:languages-4.1-noarch:languages-4.1-ppc64le:printing-4.1-noarch:printing-4.1-ppc64le
Distributor ID: RedHatEnterpriseServer
Description:    Red Hat Enterprise Linux Server release 7.6 (Maipo)
Release:        7.6
Codename:       Maipo
[root@rhel7-on-s822l ~]# uname -a
Linux rhel7-on-s822l 3.10.0-957.el7.ppc64le #1 SMP Thu Oct 4 20:51:36 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux
[root@rhel7-on-s822l ~]#

[root@rhel7-on-s822l ~]# yum info zfs
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Installed Packages
Name        : zfs
Arch        : ppc64le
Version     : 0.8.0
Release     : rc1_102_gad796b8.el7
Size        : 1.8 M
Repo        : installed
Summary     : Commands to control the kernel modules and libraries
URL         : http://zfsonlinux.org/
License     : CDDL
Description : This package contains the ZFS command line utilities.

[root@rhel7-on-s822l ~]#
[root@rhel7-on-s822l ~]# zpool list
NAME      SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
alibaba   880G   339G   541G        -         -     9%    38%  3.98x  ONLINE  -
[root@rhel7-on-s822l ~]#