no personal experience on Compellent Technologies, but have attended a few VMWare seminars where they participated as a partner.
On Sun, Sep 5, 2010 at 11:41 AM, Paul Hutchings <paul.hutchi...@mira.co.uk>wrote: > I’ll have a gander at their website. Anyone familiar with Compellent? > > > > They’re going to be quoting and have made much out of their automatic > storage tiering, the pitch being buy some fast 15k SAS disk, buy more > cheaper, slower disks (e.g. 2tb 7.2k SAS) and let the system automatically > move stuff that’s infrequently accessed to the slower, cheaper bulk storage. > > > > *From:* Andrew S. Baker [mailto:asbz...@gmail.com] > *Sent:* 05 September 2010 15:14 > > *To:* NT System Admin Issues > *Subject:* Re: SAN Storage > > > > Stonefly... > > > *ASB *(My XeeSM Profile) <http://xeesm.com/AndrewBaker> > *Exploiting Technology for Business Advantage...* > * * > > On Sat, Sep 4, 2010 at 10:32 AM, Paul Hutchings <paul.hutchi...@mira.co.uk> > wrote: > > OK so I have pricing (albeit approximate) on Lefthand, Equallogic and Dell > EMC, still waiting on Netapp. > > > > Anyone else care to throw any other vendors into the equation? > > > > I’m not convinced by the block only products, just seems it may be too much > of a limitation somewhere down the line. > > > > *From:* Paul Hutchings [mailto:paul.hutchi...@mira.co.uk] > *Sent:* 31 August 2010 17:56 > > > *To:* NT System Admin Issues > *Subject:* RE: SAN Storage > > > > Thanks Mark, have to admit I’d been mostly comparing the 16 disk Equallogic > trays and the 8 or 12 disk Lefthand. > > > > In our case out IOPS profile works out pretty low, it’s the volume of data > that pushes the spindle count up it would appear – I’m certainly not > convinced that for our file server it’s worth the price premium of SAS over, > say MDL SAS or even SATA as we have some LUNs on SATA right now and it’s > just not been an issue. > > > > The replication reserve is something I’ve heard about, IIRC Equallogic use > minimum 16mb blocks for replication whilst Netapp presumably use smaller > blocks. > > > > *From:* Weber, Mark A [mailto:mark-a-we...@uiowa.edu] > *Sent:* 31 August 2010 16:37 > *To:* NT System Admin Issues > *Subject:* RE: SAN Storage > > > > My boss did this calculation – it is usually true that at some point tray > based systems can meet or beat the same cost/GB as the EQL – for the systems > we were comparing (FAS3040 vs EQL PS6500e) it was around the 300TB mark. Of > course this all depends on what kind of deal you can get with your vendor, > how many shelves you buy at once, what features you need to enable on the > Netapp, etc. Dell gave us a killer price on our first two PS6500e’s to lock > us in – we are looking at buying one or two more and the new quote is coming > in about 6K more for the exact same system 6 months later. > > > > A few things to be aware of: > > If you go the Netapp route, I would keep in mind the cost of snapmirror for > your replication later – it isn’t cheap. > > On the EQL side – the snapshot overhead is much higher than the Netapp. The > default snap reserve on Netapp volumes is 20% and on EQL is 100%. The same > is true for replication – the default replication reserve on the EQL side is > 300% if I remember correctly. It all depends on your change rate, retention > policy, etc but there is a significant difference between the two. > > > > mark > > > > *From:* Paul Hutchings [mailto:paul.hutchi...@mira.co.uk] > *Sent:* Monday, August 30, 2010 4:15 PM > *To:* NT System Admin Issues > *Subject:* RE: SAN Storage > > > > One of the things that concerns me about Lefthand and EQL is that they are > “node” based – good for performance scale out but it means that at certain > points you’re committed to paying for a new tray complete with spindles and > controllers whilst with other vendors you pay up front for the controllers > but (hopefully) have slightly lower costs when you want to add disks as > (trays aside) all you’re doing is adding disks. > > > > The capacity we need (around 15tb usable) isn’t a nice number for either > EQL or Lefthand as it means multiple nodes. > > > > I should add to my original post that whilst budgets may mean we can’t do > it from day one, we do have a DR location with fast fibre to our main > location as we’d like to have full replication of data to this location – we > don’t need instant failover or anything, but the intention is that it would > have to be a very bad day before we’d have to hit the tapes. > > > > *From:* Steve Ens [mailto:stevey...@gmail.com] > *Sent:* 30 August 2010 20:54 > *To:* NT System Admin Issues > *Subject:* Re: SAN Storage > > > > I just implemented the LeftHand starter SAN 7.2TB...two nodes with network > RAID. The performance is amazing. 500MB transfer from SAN to local disk in > two or three seconds. > > On Mon, Aug 30, 2010 at 2:49 PM, Kurt Buff <kurt.b...@gmail.com> wrote: > > I'm looking to add in a LH unit to the two that we already have. > > The newer software (8.0) supports a kind of network RAID. My LHs are > pretty small (4tb raw) and replicate to each other, so I only have the > 4tb minus the formatting (roughly 3.7tb). The ability to add in a unit > of the same size, keep using two-way replication across three units > and basically double my storage, is pretty appealing, along with the > probable gain in throughput from the extra unit on the wire. > > Plus, relatively speaking the original units were pretty cheap. I'm > getting pricing from CDW and a couple of local firms in the next few > days, so I don't have a good guess on current pricing, but I'll bet > it's still cheaper than the bigger players, in spite of the fact that > HP bought LH a year or two ago. > > Kurt > > > On Mon, Aug 30, 2010 at 08:30, Paul Hutchings <paul.hutchi...@mira.co.uk> > wrote: > > Looking for a little feedback folks. > > > > > > > > We’ve got a SAN replacement coming up in a few months. We’re pretty much > a > > vmware shop except where a service has to run on a physical server (IO > cards > > etc.). > > > > > > > > The vendors I’m primarily looking at are Lefthand, Equallogic and Netapp, > > and possibly EMC since Dell can quote on an EMC solution as well as > > Equallogic. > > > > > > > > I’ve not had quotes yet, but so far my instincts are leaning towards > Netapp, > > mainly because of the things I keep hearing about NFS for vmware, as well > as > > the fact they seem to offer a lot of flexibility whereas Lefthand and > > Equallogic offer iSCSI and, well yeah, they offer iSCSI. > > > > > > > > Be interested to hear any experiences, especially around vmware and > > replication between SANs at live/backup sites (not a live failover site > but > > a “this will take a little work but we have a copy of the data that’s an > > hour old” site). > > > > ________________________________ > > MIRA Ltd > > Watling Street, Nuneaton, Warwickshire, CV10 0TU, England > > Registered in England and Wales No. 402570 > > VAT Registration GB 114 5409 96 > > The contents of this e-mail are confidential and are solely for the use > of > > the intended recipient. 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