Just to be clear, what you're describing is thin provisioning, not RAID or even BeyondRaid. You've created volumes that report to the susbcribing OS to be 16 TB in size, so you are at risk of oversubscribing your disk space. You're using the features of BeyondRAID to handle providing additional capacity to thin provisioned volumes when you add additional physical disks, or replace disks with larger ones.
On Thu, Sep 23, 2010 at 12:28 PM, Bob Hartung <bhart...@wiscoind.com> wrote: > We've been using a Drobo Elite for about 6 months. It has seven 2 TB WD > drives in it with dual redundant disks yielding 8.36 TB of available > storage. I use it for Acronis backup images. > > One of the drives failed about a week after we installed them. The Drobo > alerted me which drive had failed and I got a replacement and stuffed it in > and it automatically rebuilt the array without any interruptions. > > Someone mentioned that the smallest drive somehow define capacity. That not > true. If you go to the Data Robotics website, they have a space calculator > app that tells you the usable storage space with any combination of drive > sizes and redundancy settings. > > One of the biggest benefits I see with the Beyond RAID is volume size > flexibility. On a typical RAID, if you specify a 500 MB volume and you reach > that limit and need more you have to backup the data, destroy the volume and > recreate it with a larger size and restore the data. > > With Beyond RAID, you can either specify a 500 MB volume and have the same > situation as a conventional RAID. But you can also elect to make the Volume > size 16 TB. Then you can let the volume grow as large as there is free space > available on the installed drives. I make all my volumes 16 TB. If I start > running out of room, I'll add another 2 TB drive. When that's full, I'll > pull one of the 2 TB drives out and stick in a 4 TB drive (or whatever the > current big drive available is). > > Other benefits... > > - No trays. You just stick the bare drive in. > - Drive order is unimportant. If you shutdown the Drobo, pulled all the > drives and stuck them back in randomly and fired it up, there'd be no > problem. > > It's more expensive than a NAS but it's worth it for the Beyond RAID. It's > also a lot less expensive than a typical SAN. > > I think it great technology. > > ---------------------- > > Bob Hartung > Wisco Industries, Inc. > 736 Janesville St. > Oregon, WI 53575 > Tel: (608) 835-3106 x215 > Fax: (608) 835-7399 > e-mail: bhartung(at)wiscoind.com > > ------------------------------ > *From:* Raper, Jonathan - Eagle [mailto:jra...@eaglemds.com] > *To:* NT System Admin Issues [mailto:ntsysadmin@lyris.sunbelt-software.com > ] > *Sent:* Thu, 23 Sep 2010 10:47:39 -0500 > *Subject:* RE: Speaking of Drobo ... (was: SAN question) > > Ok, so lemme get this straight – you put in 7 TB of disk and only get 3 > TB usable? Lovely. > > > > With traditional RAID, if you pulled the 1 TB drive out of that same > equation, you’d have, ummmm 4 TB… > > > > Jonathan L. Raper, A+, MCSA, MCSE > > Technology Coordinator > Eagle Physicians & Associates, PA > * > *jra...@eaglemds.com* > *www.eaglemds.com > > ------------------------------ > > *From:* N Parr [mailto:npar...@mortonind.com] > *Sent:* Thursday, September 23, 2010 11:44 AM > > *To:* NT System Admin Issues > *Subject:* RE: Speaking of Drobo ... (was: SAN question) > > > > Pretty sure raid on the Drobo defined by the smallest drive in the array. > So if you have 3 2TB drive and 1 1TB drive you will only get around 3TB of > storage. > > > ------------------------------ > > *From:* Raper, Jonathan - Eagle [mailto:jra...@eaglemds.com] > *Sent:* Thursday, September 23, 2010 10:36 AM > *To:* NT System Admin Issues > *Subject:* Speaking of Drobo ... (was: SAN question) > > Ok, so it SEEMS like a really cool device, but I honestly haven’t looked at > it seriously since the device first came out a couple of years ago. When I > first looked at it, I was like, ok, now THAT’s COOL. > > > > However, after thinking about it some, it just seemed like some black magic > under the covers to get their “BeyondRAID” to work. When I originally > looked at it, I couldn’t find any technical detail on how the product ** > really** worked, as that was “proprietary” (understandably so, but still, > how am I going to get comfortable with it as a sysadmin, especially at the > price if I’m on a budget – it would be an expensive toy. Traditional RAID is > just much more comforting to me. If you have a big issue with multiple > drives of different sizes on a drobo unit, how is data recovery going to go > for you? If the controller fails, and you don’t have a support agreement, > you can’t just go on serversuply.com and get parts… > > > > Does anyone here have any experience with data recovery on a failed drobo, > or for that matter, simply a failed drive within a drobo where you had > drives of different sizes in the configuration? > > > > I know “backup, backup, backup”, but what if the backup doesn’t work (or > the customer/end user didn’t heed your advice)? > > Jonathan L. Raper, A+, MCSA, MCSE > Technology Coordinator > Eagle Physicians & Associates, PA* > *jra...@eaglemds.com* > *www.eaglemds.com > ------------------------------ > > *From:* Jonathan Link [mailto:jonathan.l...@gmail.com] > *Sent:* Thursday, September 23, 2010 11:16 AM > *To:* NT System Admin Issues > *Subject:* Re: SAN question > > > > +1 > > Going back to a previous comment of mine in another thread you started. > Have you messed with OpenFiler, yet? You'll learn a lot. > > Also, based on your pretty low requirements, have you looked at the > DroboElite? If it had been available when I started looking, I very well > could've gone in this direction. As it is, I'm seriously considering it for > backup duty. Storage for a backup server, and the ability to use it in a > pinch if my EqualLogic goes down. > > On Thu, Sep 23, 2010 at 10:59 AM, Raper, Jonathan - Eagle < > jra...@eaglemds.com> wrote: > > John - I do not believe that we can help you significantly with this > question. In the end, it really doesn't matter what any of us think, because > our environments are all different and unique. What works well and may be > appropriate for any of us, may be a horrible fit for you and cause you > nothing but heartburn and stress. > > However, I would tend to agree with Niles. If you're not ready for a SAN, > don't spend the money on it now. > > You really need to have a serious sit-down with the vendors/sales engineers > (notice I said ENGINEER, not REP) of the different hardware, learn as much > as you can from THEM, and ask LOTS of questions. Then ask them why you > should choose their product over x, y, or z product. Take lots of notes, and > then do the same thing all over again, no more than a few days apart so > everything is still fresh in your head. > > Many times, some of the best education I've gotten has been from the > manufacturers themselves. I've actually been to the EMC manufacturing > facility in North Carolina - I spent two days there, on THEIR DIME to learn > about their products (I had to get there & back, but after that, everything > was on them). If you say to them, "I'd like an education on how your product > works and whether or not it would be suitable for my needs and my > applications.", you'll generally get plenty of intelligent people that will > be happy to answer your questions. If they don't ask lots of questions about > your environment and what your needs are, you're talking to the wrong > people. > > I believe that the purpose of this list is really a, "I'm having trouble > with x, has anyone seen this before?" or "why do you guys think x > specification/technology is better than y", or "I'm having trouble getting > this ADSIedit script working, what am I doing wrong?". > > I believe that if you sit down with the various manufacturers/reps, even if > only on a webex session where they can whiteboard for you one on one, will > answer many of your questions and make your original question about > intelligence/disks seem trivial. > > Regards, > > > Jonathan L. Raper, A+, MCSA, MCSE > Technology Coordinator > Eagle Physicians & Associates, PA > jra...@eaglemds.com > www.eaglemds.com > > -----Original Message----- > From: N Parr [mailto:npar...@mortonind.com] > Sent: Thursday, September 23, 2010 10:26 AM > To: NT System Admin Issues > > Subject: RE: SAN question > > I think you just need to give up on your SAN dreams and go buy a decent > NAS for a couple grand and call it good. You just said it's going to be > a file server for the time being so why spend the money for a SAN now if > you don't need it. I bet if I look back through the archives you first > brought this up at least 18 months ago. When, if , you do need a SAN > down the road you won't have already spent a ton of $$ on what will then > be old tech and you can start looking at what will then be new. > > -----Original Message----- > From: John Aldrich [mailto:jaldr...@blueridgecarpet.com] > Sent: Thursday, September 23, 2010 9:17 AM > To: NT System Admin Issues > Subject: SAN question > > Ok, guys. I'm trying to narrow down my many choices with regards to our > on-going search for a SAN manufacturer. I'd like your thoughts on the > whole question of adding more intelligence vs just adding more disks. > i.e. the EQ vs LeftHand models. > > I can see arguments to be made for both models. I'll tell you that, > initially, the SAN is going to be a glorified file server, however, we > plan on hosting our email data store on the SAN when we bring email > in-house later on. I've already verified with the email vendor that I > hope to use that this is not a problem, so that's a non-issue. Other > than that, the only database we would store on the SAN would possibly be > the database from our Vipre install, although initially that would stay > on the local storage. > > So, I'd like to see some discussions of the benefits of just adding a > tray of "dumb drives" or adding a complete controller along with the > drives (a la > LeftHand.) > > I just don't know enough about the benefits of each model to know what > would work best for us. I'm hoping that you guys who are more > experienced would give me the benefit of your knowledge. > > > > Thanks, > John Aldrich > IT Manager, > Blueridge Carpet > 706-276-2001, Ext. 2233 > > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > Any medical information contained in this electronic message is > CONFIDENTIAL and privileged. It is unlawful for unauthorized persons to > view, copy, disclose, or disseminate CONFIDENTIAL information. This > electronic message may contain information that is confidential and/or > legally privileged. It is intended only for the use of the individual(s) > and/or entity named as recipients in the message. If you are not an intended > recipient of this message, please notify the sender immediately and delete > this material from your computer. Do not deliver, distribute or copy this > message, and do not disclose its contents or take any action in reliance on > the information that it contains. > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin
