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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If performance is your main driver why in God’s name are you using NAS vs SAN anyway?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Jeffrey C. Lightner</span></i><i><span style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Sr. UNIX Administrator</span></i><i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">DS Waters of America, Inc.</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">5660 New Northside Drive NW</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
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<i>678-486-3516<o:p></o:p></i></span></p>
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<p class="MsoNormal"><span lang="PT" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">E:
<i>jlightner@water.com</i><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> ale-bounces@ale.org [mailto:ale-bounces@ale.org]
<b>On Behalf Of </b>Jeff Hubbs<br>
<b>Sent:</b> Thursday, February 13, 2014 1:18 PM<br>
<b>To:</b> ale@ale.org<br>
<b>Subject:</b> Re: [ale] backup/restore mail from USB external drive<o:p></o:p></span></p>
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<p class="MsoNormal">Because the probability of having an unrecoverable read error on RAID5 rebuild starts to come up off the peg and RAID6 isn't much better.
<br>
<br>
Since they came on the market, I've found that NASses both cheap (e.g., LaCie) and expensive (IBM-rebadged NetApp where you paid extra by the protocol) aren't worth spit. Sure, they work (sort of - I got a LaCie guy to admit to me once that their NFS implementation
was badly broken but they didn't really care), but the sorts of things you may expect to do administratively, like make fast copies internally, scan for viruses, or search for files (for instance, because someone had an errant mouse drag that moved their quarterly
report spreadsheets to God-knows-where) are ruinously slow. To give you some idea, I once replaced said rebadged NetApp - that cost about $40,000 - with a SuperMicro-based Gentoo Linux file server with a mix of SAS and SATA drives in 24 slots in the front,
two SSDs inside, two SAS controllers (with RAID10 with the RAID1 pairs split across controllers so a controller would die and you still wouldn't lose the volume), and two four-core CPUs. All that plus a warm-swap machine, spare mobo, spare CPUs, power supplies,
NICs, disk controllers, and RAM (to heck with waiting for some schmoe from e.g. IBM's field service contractor to find your site and replace parts in a machine he might have never seen before anyway) cost about $25K, and it could scan its main shared-space
volume with clamav at over 200MiB/s. In-slot NICs were bonded for I/O (the on-mobo NICs were not used in order to reduce the risk to the mobo). It was NFSv3-ready, had Samba of course, and daemons for anonymous chrooted FTP and rsync - and there was talk
at one time of having it serve out CVS (it'd might as well!). <br>
<br>
So when you talk to me about what RAID configuration I'd recommend for 12x2TB drives in a NAS, I'm thinking of the operational risks you've baked into your IT resources just by having a NAS in the first place and wondering whether or not RAID nuances would
matter all that much at the end of the day. Ask yourself this: even if it were just half full, how long would it take you to do a complete read for backup-making purposes? See, in this day and age, it's real easy to have giant amounts of storage and therefore
giant amounts of stuff being stored, all connected to everything else by what are very tiny pipes, relatively speaking.
<br>
<br>
On 2/12/14, 6:43 PM, Ray Vastly wrote:<o:p></o:p></p>
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<p>Why should you avoid raid 5 or 6 when using large hard disks? What Raid configuration would you recommend for 12 HDDs each 2 TB in a NAS?<o:p></o:p></p>
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<p class="MsoNormal">On Feb 12, 2014 6:40 PM, "Jeff Hubbs" <<a href="mailto:jhubbslist@att.net">jhubbslist@att.net</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">On 2/12/14, 5:00 PM, Lightner, Jeff wrote:<o:p></o:p></p>
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<p class="MsoNormal"><snip> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You really should be using RAID6 or RAID10 rather than RAID5 as it is even more redundant (i.e. can
survive 2 disks failures). </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">And you shouldn't be using RAID5 or RAID6 at all if your drives are 750-1000GB or larger.
<br>
<br>
Mail and database servers would be two good places to make use of snapshotting filesystems. Note that some email systems that use message stores go insane if the message store is not in the state that the rest of the email system presumes it's in, so you have
to make sure that your backup/recovery scheme doesn't capture messages and message metadata/index in different states.<br>
<br>
<o:p></o:p></p>
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See JOBS, ANNOUNCE and SCHOOLS lists at<br>
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<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Ale mailing list<o:p></o:p></pre>
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