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  1. #1
    Join Date
    Oct 2004
    Posts
    626

    ZFS backup storage server

    We are looking for good value central backup server for all of our cpanel servers, I googled and found that RAID-Z2 (similar to RAID-6) seems a good option and we want to setup it on software based without any raid card

    my question are :

    * to how many HDs that we will hit performance bottleneck? so we could evaluate cost/performance

    * and any budget and smart method to boost performance up?

    thanks!

  2. #2
    Join Date
    Feb 2004
    Location
    UK
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    1,429
    Hi

    Have you looked at this ?

    http://nexentastor.org/ <- will do 16TB for free

    so 4 x 4tb
    or
    8 x 2tb
    16 x 1tb

    From experience the more spindles the better the performance, but the higher the running costs (ie more disks)

    Thanks

  3. #3
    Join Date
    May 2007
    Location
    Bhopal - India
    Posts
    331
    8 x 2TB should be sufficient for a medium size deployment, enable compression to save storage and add a ZIL SSD for better write performance.
    LoopByte - Fastest growing Indian dedicated servers provider
    India Based Managed Dedicated Servers, VPS & Hosting Services

  4. #4
    Join Date
    Dec 2011
    Location
    Tulsa, OK
    Posts
    353
    +1 for nexenta.
    OCOSA Communications | Since 2003
    http://www.ocosa.com
    Hosting, Connectivity, Professional Services

  5. #5
    Join Date
    Feb 2002
    Location
    New York, NY
    Posts
    4,551
    Make sure that you test it well before using ZFS. We used ZFS (with RAID-Z2) on some backup servers a few years ago, and had a terrible experience, on both Solaris and FreeBSD.

    Assuming that you have lots of RAM, and that they have fixed the stability issues, you should get decent performance in the beginning. The problem is that it gets extremely fragmented over time. Within months, the servers were becoming barely usable, which made it all the more difficult to get rid of ZFS.

    As far as I know, there's still no online defragmentation feature, which is what is needed to make ZFS usable as a central backup server. It might work well enough for you, but keep a close eye on it.
    Scott Burns, President
    BQ Internet Corporation
    Remote Rsync and FTP backup solutions
    *** http://www.bqbackup.com/ ***

  6. #6
    Join Date
    Mar 2009
    Location
    NL
    Posts
    553
    Quote Originally Posted by bqinternet View Post
    Make sure that you test it well before using ZFS. We used ZFS (with RAID-Z2) on some backup servers a few years ago, and had a terrible experience, on both Solaris and FreeBSD.

    Assuming that you have lots of RAM, and that they have fixed the stability issues, you should get decent performance in the beginning. The problem is that it gets extremely fragmented over time. Within months, the servers were becoming barely usable, which made it all the more difficult to get rid of ZFS.

    As far as I know, there's still no online defragmentation feature, which is what is needed to make ZFS usable as a central backup server. It might work well enough for you, but keep a close eye on it.
    There are no stability issues. We have about 10 servers running Opensolaris / Nexenta Core with an uptime > 1 year (one > 2 years). Zero crashes or issues on all of them. Different clients using them and all kinds of disks (mostly nearline SAS though). All Supermicro servers.
    YISP - High Bandwidth dedicated servers and colocation in YISP-AS(Amsterdam)!

    Website: http://www.yisp.com
    Contact: info "(AT)" yisp.com

  7. #7
    Join Date
    May 2007
    Location
    Bhopal - India
    Posts
    331
    We also have few Nexenta/OpenIndiana boxes running pretty well.
    LoopByte - Fastest growing Indian dedicated servers provider
    India Based Managed Dedicated Servers, VPS & Hosting Services

  8. #8
    Join Date
    Jan 2012
    Location
    Zagreb/Boston
    Posts
    226
    word of warning, nexenta license says you cannot use it in commercial or business use.

    have no heard anyone getting sued or contacted about it, but you never know.

    http://www.nexentastor.org/projects/...mmunityEdition

    Production use is not allowed with Community edition. It is designed and intended to help people become familiar with the product or for hobbiest use.
    and from EULA

    2.2 If You have acquired a Community Edition license, the total amount of RAW Storage Space is limited as specified on the Site and is subject to change without notice. The Community Edition may ONLY be used for educational, academic and other non-commercial purposes expressly excluding any commercial usage. The Trial Edition licenses may ONLY be used for the sole purposes of evaluating the suitability of the Product for licensing of the Enterprise Edition for a fee. If You have obtained the Product under discounted educational pricing, You are only permitted to use the Product for educational and academic purposes only and expressly excluding any commercial purposes.
    alternative would be :

    http://www.napp-it.org

    on any supported solarwinds based distribution

  9. #9
    Join Date
    Apr 2010
    Posts
    487
    Quote Originally Posted by PeterPP View Post
    We are looking for good value central backup server for all of our cpanel servers, I googled and found that RAID-Z2 (similar to RAID-6) seems a good option and we want to setup it on software based without any raid card

    my question are :

    * to how many HDs that we will hit performance bottleneck? so we could evaluate cost/performance

    * and any budget and smart method to boost performance up?

    thanks!
    ZFS likes ram and likes it even more as you use more and more features.

    As to performance a single 7200 rpm sata drive can take more than a single ge can feed it. Even running a pair of 20gbs infiniband connections full out were not pushing our 48 drive backup heads (144TB in 4ru 192TB if we bought more expensive per GB drives). That said look hard at what your using to back up all backup apps are not created equal some can really stress out the servers and/or the backup heads. We do treat backup drives like tape so no raid the backup system makes redundant copies on multiple backup heads and no random io trashing performance.

  10. #10
    +1 for napp-it.org. The main force behind that is active on our fourms.

    The big thing with ZFS software RAID is that you use compatible hardware and test beforehand. Great solution though. Performance wise for backup no issue. You could also use RAID-Z3 for a larger set of disks if you wanted.
    My site dedicated to server and workstation hardware: http://www.servethehome.com

  11. #11
    Join Date
    Mar 2003
    Location
    chicago
    Posts
    1,510
    all the zfs issues i have seen has been a lack of zfs knowledge not zfs

  12. #12
    Join Date
    Oct 2004
    Posts
    626
    http://www.nexentastor.org/ does looks good! thanks!

  13. #13
    Join Date
    Feb 2004
    Location
    UK
    Posts
    1,429
    Quote Originally Posted by PeterPP View Post
    http://www.nexentastor.org/ does looks good! thanks!
    Yep .. it is, but can get a little expensive if you need more than the 18TB or raw storage.

  14. #14
    Join Date
    Oct 2004
    Posts
    626
    just want to share this nice article
    http://www.solarisinternals.com/wiki...ractices_Guide

    then I have a question after reading, article says

    **For better performance, a mirrored configuration is strongly favored over a RAIDZ configuration particularly for large, uncacheable, random read loads.**

    is it a better than raidZ for backup purpose?

    also, if I go with 2TBx6 with raidz2 for beginning, is it easy to add more disks to raidz2 in the future when needed?

  15. #15
    Join Date
    Oct 2004
    Posts
    626
    and what about
    http://www.freenas.org/
    http://www.nas4free.org/

    should be no 16TB limitations?

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