Right; stuff like EMC does similar things, and faster. The reason Drobos are so slow is because it's allocating data across drives using software, and with the processors they have in those devices, it's just not very fast. Obviously the faster the processor they use, the more it improves the situation.
You can also do a lot of the same "ooh wow, I've got different drive size" deal with stuff like FreeNAS, which will work with ZFS. It's not like Drobo is completely unique.
Thank you. That's exactly the point and I am not sure why many are missing this.
Let's try to sift through the marketing that the Drobo website has put up.
Drobo website said:Unfortunately, the complexity of RAID has made it challenging for small businesses and consumers to effectively use the technology. RAID has a high learning curve with many options. There's RAID levels 0, 1, 5, 6, 10, 50, and 60 along with unfamiliar terminology like striping, mirroring, and parity.
What a load of BS. Have you seen how easy it is to configure a Synology NAS, even with the previous version of the software? I could train a chimpanzee to do it.
Oh, so actually it's exactly what Drobo does. But ok, let's keep going and drink the Drobo kool-aid.Synology said:Synology Hybrid RAID (SHR)
Synology Hybrid RAID (SHR) is an intelligent volume type that optimizes volume size when combining hard disks of varying sizes into an array. When set as the Standard volume type in DSM, SHR provides 1 to 2 hard disks fault-tolerance of data protection. It can be expanded to an optimal volume space when a lager or additional hard disks are inserted into the array.
For users who prefer to manually configure the volume type, DSM offers RAID-protected volume types (2-4 way RAID 1, RAID 10, RAID 5, RAID 5+Spare, and RAID 6) as well as volume types without data protection (Basic, JBOD, and RAID 0).
Drobo website said:Aside from complexity, these are the primary challenges with traditional RAID:
1. Lock-in of RAID levels. To change RAID levels, most storage arrays require the data to be moved off of it, reconfigured, and then moved back on. If you want to move to RAID 6 from RAID 5 for protection against two drive failures, it's a reinitialize and start over.
Ha ha. How can people lie like this? I wonder if the engineers are Drobo cringe when they see what marketing has put up on the website. I hope so. Let's look at what the old version of Synology's DSM has been able to do for ages
Synology said:Change Volume Type
DSM 3.0 provides the following four types of volume change:
Basic to RAID 1
Basic to RAID 5
RAID 1 to RAID 5
RAID 5 to RAID 5+Spare
RAID 5 to RAID 6
Oh, wait a minute….
Lack of expandability. Once drives are configured into a RAID pool, that is it. If you want to add more storage capacity, the solution is to create a new RAID pool, leaving you with another chunk of storage to manage - or you can just reinitialize and start over.
This is just plain wrong and a lie. Again, how can one not feel ashamed to put this sort of stuff on the internet? Let's take a look what the old version of Synology's DSM can do (quite easily)
To put it into simpler words. Let's say I have a NAS with 5 x 2 TB drives. I can replace one of the drives with a 3 TB and allow it to rebuild. I can then replace the next 3 TB drive and allow it to rebuild... and so forth. This will all happen automatically. At the end I would have gone from 10 TB of total space to 15 TB of total space (usable space will obviously depend on RAID level and number of hot spares)Synology website said:Storage Expansion Made Easy
DSM 3.0 offers flexible options for volume expansion and growth. Small volumes can be expanded whenever the need arises by adding drives to the array, replacing drives with those of larger capacity, or adding a Synology expansion unit to compatible models.
Hmmmm…. hold on a second…