------=_Part_850_29656067.1369990209067 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable So, we can say that dedup has more disadvantages than advantages.=20 And what about dedup of Netapp?=20 Jose=20 ----- Original Message ----- From: "Karli Sj=C3=B6berg" <Karli.Sjoberg@slu.se>=20 To: suporte@logicworks.pt=20 Cc: "Jiri Belka" <jbelka@redhat.com>, users@ovirt.org=20 Sent: Quinta-feira, 30 de Maio de 2013 8:33:19=20 Subject: Re: [Users] deduplication=20 ons 2013-05-29 klockan 09:59 +0100 skrev suporte@logicworks.pt:=20 Absolutely agree with you, planning is the best thing to do, but normally p= eople want a plug'n'play system with all included, because there is not muc= h time to think and planning, and there are many companies that know how to= take advantage of this people characteristics.=20 Any way, I think another solution for dedup is FreeNAS using ZFS.=20 FreeNAS is just FreeBSD with a fancy web-ui ontop, so it=C2=B4s neither mor= e or less of ZFS than you would have otherwise, And regarding dedup in ZFS;= Just don=C2=B4t, it=C2=B4s not worth it! It=C2=B4s said that it may increa= se performance when you have a very suitable usecase, e.g. everything exact= ly the same over and over. What=C2=B4s not said is that scrubbing and resil= vering slows down to a snail (from hundreds of MB/s, or GB if your system i= s large enough, down to less than 10), just from dedup. Also deleting snaps= hots of datasets that have(or have had) dedup on can kill the entire system= , and when I say kill, I mean really fubar. Been there, regretted that... N= ow, compression on the other hand, you get basically for free and gives dec= ent savings, I highly recommend that.=20 /Karli=20 <blockquote> Jose=20 </blockquote> <blockquote> From: "Jiri Belka" <jbelka@redhat.com>=20 To: suporte@logicworks.pt=20 Cc: users@ovirt.org=20 Sent: Quarta-feira, 29 de Maio de 2013 7:33:10=20 Subject: Re: [Users] deduplication=20 On Tue, 28 May 2013 14:29:05 +0100 (WEST)=20 suporte@logicworks.pt wrote:=20
That's why I'm making this questions, to demystify some buzzwords around = here.=20 But if you have a strong and good technology why not create buzzwords to = get into as many people as possible? without trapped them.=20 Share a disk containing "static" data is a good idea, do you know from wh= ere I can start?=20
Everything depends on your needs, design planning. Maybe then sharing=20 disk would be better to share via NFS/iscsi. Of course if you have many=20 VMs each of them is different you will fail. But if you have mostly=20 homogeneous environment you can think about this approach. Sure you have=20 to have plan for upgrading "base" "static" shared OS data, you have to=20 have plan how to install additional software (different destination=20 than /usr or /usr/local)... If you already have your own build host=20 which builds for you OS packages and you have already your own plan for=20 deployment, you have done first steps. If you depend on upgrading each=20 machine separately from Internet, then first you should plan your=20 environment, configuration management etc.=20 Well, in many times people do not do any planning, they just think some=20 good technology would save their "poor" design.=20 j.=20 </blockquote> <blockquote> </blockquote> =09--=20 Med V=C3=A4nliga H=C3=A4lsningar=20 ---------------------------------------------------------------------------= ----=20 Karli Sj=C3=B6berg=20 Swedish University of Agricultural Sciences=20 Box 7079 (Visiting Address Kron=C3=A5sv=C3=A4gen 8)=20 S-750 07 Uppsala, Sweden=20 Phone: +46-(0)18-67 15 66=20 karli.sjoberg@slu.se=20 ------=_Part_850_29656067.1369990209067 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'>p { margin: 0; }</style></head><body><= div style=3D'font-family: arial,helvetica,sans-serif; font-size: 10pt; colo= r: #000000'>So, we can say that dedup has more disadvantages than advantage= s.<br><br>And what about dedup of Netapp?<br><br>Jose<br><br><hr id=3D"zwch= r"><div style=3D"color: rgb(0, 0, 0); font-weight: normal; font-style: norm= al; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-si= ze: 12pt;"><b>From: </b>"Karli Sj=C3=B6berg" <Karli.Sjoberg@slu.se><b= r><b>To: </b>suporte@logicworks.pt<br><b>Cc: </b>"Jiri Belka" <jbelka@re= dhat.com>, users@ovirt.org<br><b>Sent: </b>Quinta-feira, 30 de Maio de 2= 013 8:33:19<br><b>Subject: </b>Re: [Users] deduplication<br><br> ons 2013-05-29 klockan 09:59 +0100 skrev suporte@logicworks.pt: <blockquote><font color=3D"#000000">Absolutely agree with you, planning is = the best thing to do, but normally people want a plug'n'play system with al= l included, because there is not much time to think and planning, and there= are many companies that know how to take advantage of this people characteristics.</font><br> <font color=3D"#000000">Any way, I think another solution for dedup is Free= NAS using ZFS.</font><br> </blockquote> <br> FreeNAS is just FreeBSD with a fancy web-ui ontop, so it=C2=B4s neither mor= e or less of ZFS than you would have otherwise, And regarding dedup in ZFS;= Just don=C2=B4t, it=C2=B4s not worth it! It=C2=B4s said that it <b>may</b> increase performance when you have a very suitable usecase, e.g.= everything <b>exactly</b> the same over and over. What=C2=B4s not said is that scrubbi= ng and resilvering slows down to a snail (from hundreds of MB/s, or GB if y= our system is large enough, down to less than 10), just from dedup. Also de= leting snapshots of datasets that have(or have had) dedup on can kill the entire system, and when I say kill, I mean= really fubar. Been there, regretted that... Now, compression on the other = hand, you get basically for free and gives decent savings, I highly recomme= nd that.<br> <br> /Karli<br> <br> <blockquote><br> <font color=3D"#000000">Jose</font><br> <br> <br> <hr align=3D"center"> </blockquote> <blockquote><b><font color=3D"#000000">From: </font></b><font color=3D"#000= 000">"Jiri Belka" <jbelka@redhat.com></font><br> <b><font color=3D"#000000">To: </font></b><font color=3D"#000000">suporte@l= ogicworks.pt</font><br> <b><font color=3D"#000000">Cc: </font></b><font color=3D"#000000">users@ovi= rt.org</font><br> <b><font color=3D"#000000">Sent: </font></b><font color=3D"#000000">Quarta-= feira, 29 de Maio de 2013 7:33:10</font><br> <b><font color=3D"#000000">Subject: </font></b><font color=3D"#000000">Re: = [Users] deduplication</font><br> <br> <font color=3D"#000000">On Tue, 28 May 2013 14:29:05 +0100 (WEST)</font><br=
<font color=3D"#000000">suporte@logicworks.pt wrote:</font><br> <br> <font color=3D"#000000">> That's why I'm making this questions, to demys= tify some buzzwords around here. </font><br> <font color=3D"#000000">> But if you have a strong and good technology w= hy not create buzzwords to get into as many people as possible? without tra= pped them. </font><br> <font color=3D"#000000">> Share a disk containing "static" data is a goo= d idea, do you know from where I can start? </font><br> <br> <font color=3D"#000000">Everything depends on your needs, design planning. = Maybe then sharing</font><br> <font color=3D"#000000">disk would be better to share via NFS/iscsi. Of cou= rse if you have many</font><br> <font color=3D"#000000">VMs each of them is different you will fail. But if= you have mostly</font><br> <font color=3D"#000000">homogeneous environment you can think about this ap= proach. Sure you have</font><br> <font color=3D"#000000">to have plan for upgrading "base" "static" shared O= S data, you have to</font><br> <font color=3D"#000000">have plan how to install additional software (diffe= rent destination</font><br> <font color=3D"#000000">than /usr or /usr/local)... If you already have you= r own build host</font><br> <font color=3D"#000000">which builds for you OS packages and you have alrea= dy your own plan for</font><br> <font color=3D"#000000">deployment, you have done first steps. If you depen= d on upgrading each</font><br> <font color=3D"#000000">machine separately from Internet, then first you sh= ould plan your</font><br> <font color=3D"#000000">environment, configuration management etc.</font><b= r> <br> <font color=3D"#000000">Well, in many times people do not do any planning, = they just think some</font><br> <font color=3D"#000000">good technology would save their "poor" design.</fo= nt><br> <br> <font color=3D"#000000">j.</font><br> <br> </blockquote> <blockquote><br> <br> </blockquote> <br> <table cellpadding=3D"0" cellspacing=3D"0" width=3D"100%"> <tbody> <tr> <td>-- <br> <br> Med V=C3=A4nliga H=C3=A4lsningar<br> ---------------------------------------------------------------------------= ----<br> Karli Sj=C3=B6berg<br> Swedish University of Agricultural Sciences<br> Box 7079 (Visiting Address Kron=C3=A5sv=C3=A4gen 8)<br> S-750 07 Uppsala, Sweden<br> Phone: +46-(0)18-67 15 66<br> <a href=3D"mailto:karli.sjoberg@adm.slu.se" target=3D"_blank">karli.sjoberg= @slu.se</a> </td> </tr> </tbody> </table> </div><br></div></body></html> ------=_Part_850_29656067.1369990209067--