Overclock.net › Forums › Specialty Builds › Servers › Confused about raid
New Posts  All Forums:Forum Nav:

Confused about raid - Page 2

post #11 of 14
Quote:
Originally Posted by parityboy View Post
@OP

If you want to do simple storage pooling with duplication, then either Windows Home Server 1.x with Drive Extender, Windows Home Server 2.x with a Drive Extender clone, or Amahi Home Server (which incorporates Greyhole) will serve your needs.

If you want to maximise your usable storage capacity, then some kind of parity-based redundancy mechanism is the way to go.

a) FlexRAID. This available for Windows and Linux.

b) Linux software RAID (md RAID). This is a software RAID and is obviously native to Linux. It performs very well, is very robust and reliable, and in the several years I've been using it to manage around 5TB of data, it's never let me down.

md RAID is available for virtually every Linux distribution, including Amahi Home Server (which is based on Fedora), and supports parity RAID levels 4, 5, and 6. It's also available for more storage-focused Linux distributions such as Openfiler and QuantaStor.

c) NexentaStor. This is an OpenSolaris-based OS, focused on being a storage target. It's primary filesystem is ZFS, which is a filesystem, volume manager and RAID engine in one. It's incredibly robust, and can self-heal corrupted data. Right now ZFS is the most sophisticated and robust data storage mechanism available. NexentaStor also supports NFS and CIFS, so you can share a ZFS volume out to Windows clients.

Lastly, NexentaStor Community Edition supports up to 18TB. After that, you have to start paying for it.

d) RAID card The benefits of this choice are CPU-offloading (for true hardware RAID), lower latency (for true hardware RAID) and easier management. I'd stay away from fakeRAID cards, since they can prove to be unstable in RAID 5, and have poor performance. However, hardware RAID cards can prove to be expensive - unless you pick up a bargain Dell PERC 5/i or PERC 6/i on eBay.
I'd like to mention the following here:

e) unRAID. This works somewhat similar to FlexRAID, except it does parity calculations on the fly, is Linux-only and it needs to have its own dedicated hardware. The best way to describe it would be RAID-4 without striping. The array could withstand a single drive failure without losing data. Another nice thing about it is since it's JBOD, if you have 2 or more drive failures, you only lose data contained in those drives unlike in RAID-5 where you lose your whole array. It's also very power friendly. Since data isn't striped, it can spin down drives that are not in use which can make for significant power savings when you've got 10 drives in your array or more. You can also mix and match different drives and drive sizes.

Currently, unRAID supports up to a maximum of 40TB storage (20x2TB data, 1x2TB parity) in a protected array. Right now, unRAID only supports 2TB HDD's (including advanced format/4k) but the developer has mentioned support will be coming for 2+ TB HDD's. The biggest drawback with unRAID are the write speeds. Since it's doing a bunch of read/write operations on the parity disk and data disk being written to whenever you write something to the array, writes can be quite a bit slower than a single HDD configuration. Another thing, since it's a customized Linux distribution that fits on even a 512MB flash drive, it's somewhat feature-limited. It works great for storing your data, but beyond that, it'll take quite a bit of work to get it to do other things such as act as torrent downloader, etc. You can get more information about unRAID here.
Edited by rui-no-onna - 3/14/11 at 7:27am
Garnet
(11 items)
 
Lucifiel
(13 items)
 
Metatron
(13 items)
 
CPUMotherboardRAMHard Drive
Intel Core i5-3450S Intel DQ77KB Corsair 16GB DDR3 1600 SO-DIMM Samsung 830 256GB 
Hard DriveHard DriveCoolingOS
Crucial m4 256 mSATA Samsung 840 500GB Intel BXHTS1155LP Windows 7 Ultimate x64 
KeyboardCaseMouse
Logitech K800 Lian Li PC-Q05B Logitech M570 
CPUMotherboardGraphicsRAM
Core i7-860 Gigabyte GA-H55N-USB3 EVGA GTX 460 1GB GDDR5 Kingston 2x4GB DDR3 1333 
Hard DriveOSPowerCase
G.SKILL Phoenix Pro 120GB Windows 7 Ultimate x64 Silverstone ST45SF 450W Silverstone Sugo SG05B 
CPUMotherboardGraphicsRAM
Core i7-860 Biostar TH55B HD MSI GT 240 1GB GDDR5 Kingston 2x2GB DDR3 1333 
Hard DriveOSMonitorPower
Intel X25-M 120GB Windows 7 Ultimate x86 Samsung 22" Antec EA-380D 
Case
Rosewill R101-P-BK 
  hide details  
Reply
Garnet
(11 items)
 
Lucifiel
(13 items)
 
Metatron
(13 items)
 
CPUMotherboardRAMHard Drive
Intel Core i5-3450S Intel DQ77KB Corsair 16GB DDR3 1600 SO-DIMM Samsung 830 256GB 
Hard DriveHard DriveCoolingOS
Crucial m4 256 mSATA Samsung 840 500GB Intel BXHTS1155LP Windows 7 Ultimate x64 
KeyboardCaseMouse
Logitech K800 Lian Li PC-Q05B Logitech M570 
CPUMotherboardGraphicsRAM
Core i7-860 Gigabyte GA-H55N-USB3 EVGA GTX 460 1GB GDDR5 Kingston 2x4GB DDR3 1333 
Hard DriveOSPowerCase
G.SKILL Phoenix Pro 120GB Windows 7 Ultimate x64 Silverstone ST45SF 450W Silverstone Sugo SG05B 
CPUMotherboardGraphicsRAM
Core i7-860 Biostar TH55B HD MSI GT 240 1GB GDDR5 Kingston 2x2GB DDR3 1333 
Hard DriveOSMonitorPower
Intel X25-M 120GB Windows 7 Ultimate x86 Samsung 22" Antec EA-380D 
Case
Rosewill R101-P-BK 
  hide details  
Reply
post #12 of 14
I actually work in a datacenter myself. We use $700+ 3Ware (and some adaptec) cards and indeed they very rarely fail.

When they do, at least in the case the 3W ones, they have to have the model of card at the very least. You're right, i'm probably too concerned about the firmware version. The concern over it at work I think has to do with the company-specific scripts and other processes as much as anything. The company I work for also has multi-million dollar contracts for a supply of controllers and a speedy RMA process.

But what about sub-$100 consumer RAID cards? Or the controller chips on motherboards? I'm not saying they're likely to fail but if the mobo is 4 years old and that one chip dies or otherwise starts to malfunction i can't exactly buy another of the same board and it's out of RMA period. Maybe it should all be mirrored to another device anyway but it seems like being able to connect anyone of the drives to another mobo's sata port and see the data has as much advantage as anything...?
 
VM Server
(17 items)
 
 
CPUGraphicsRAMHard Drive
Intel Ivy Bridge Core i7-3630QM nVidia GeForce GTX 680M 16GB DDR3 1600MHz Dual Channel Memory (2 SODIMMS) Hard Drive: Serial-ATA II 3GB/s 
Hard DriveOSMonitorPower
Hard Drive: Serial-ATA II 3GB/s Windows 10 Pro x64 17.3" FHD 16:9 (1920x1080) Battery: Smart Li-ion Battery (8-Cell) 
Audio
Sound Blaster Compatible 3D Audio 
CPUMotherboardGraphicsRAM
Intel Core i7 860 Biostar T5 XE Radeon HD 5870 Corsair 16GB  
Hard DriveHard DriveOptical DriveOS
Western Digital hard drive wd1001fals-00e8b0 Maxtor 300GB I don't need no stinking optical drive Microsoft Windows 7 Ultimate x64 
MonitorMonitorKeyboardPower
HP ZR24w 24'' Samsung SyncMaster 24" logitech wireless k360 Seventeam ST-850ZAF 850W ATX 
CaseMouseAudioAudio
Thermaltake V9 Black Edition Logitech G500 Programmable Gaming Mouse FiiO E7 USB DAC and Portable Headphone Amplifier Sennheiser HD555 Professional Headphones 
  hide details  
Reply
 
VM Server
(17 items)
 
 
CPUGraphicsRAMHard Drive
Intel Ivy Bridge Core i7-3630QM nVidia GeForce GTX 680M 16GB DDR3 1600MHz Dual Channel Memory (2 SODIMMS) Hard Drive: Serial-ATA II 3GB/s 
Hard DriveOSMonitorPower
Hard Drive: Serial-ATA II 3GB/s Windows 10 Pro x64 17.3" FHD 16:9 (1920x1080) Battery: Smart Li-ion Battery (8-Cell) 
Audio
Sound Blaster Compatible 3D Audio 
CPUMotherboardGraphicsRAM
Intel Core i7 860 Biostar T5 XE Radeon HD 5870 Corsair 16GB  
Hard DriveHard DriveOptical DriveOS
Western Digital hard drive wd1001fals-00e8b0 Maxtor 300GB I don't need no stinking optical drive Microsoft Windows 7 Ultimate x64 
MonitorMonitorKeyboardPower
HP ZR24w 24'' Samsung SyncMaster 24" logitech wireless k360 Seventeam ST-850ZAF 850W ATX 
CaseMouseAudioAudio
Thermaltake V9 Black Edition Logitech G500 Programmable Gaming Mouse FiiO E7 USB DAC and Portable Headphone Amplifier Sennheiser HD555 Professional Headphones 
  hide details  
Reply
post #13 of 14
Quote:
Originally Posted by subassy View Post
But what about sub-$100 consumer RAID cards? Or the controller chips on motherboards? I'm not saying they're likely to fail but if the mobo is 4 years old and that one chip dies or otherwise starts to malfunction i can't exactly buy another of the same board and it's out of RMA period. Maybe it should all be mirrored to another device anyway but it seems like being able to connect anyone of the drives to another mobo's sata port and see the data has as much advantage as anything...?
I'd be more concerned about sub-$100 RAID cards than motherboard controllers. The Intel RAID implementation may not be the best performing but as long as your replacement motherboard supports Intel RAID (ICHxR), your array should be usable on the new motherboard.
Garnet
(11 items)
 
Lucifiel
(13 items)
 
Metatron
(13 items)
 
CPUMotherboardRAMHard Drive
Intel Core i5-3450S Intel DQ77KB Corsair 16GB DDR3 1600 SO-DIMM Samsung 830 256GB 
Hard DriveHard DriveCoolingOS
Crucial m4 256 mSATA Samsung 840 500GB Intel BXHTS1155LP Windows 7 Ultimate x64 
KeyboardCaseMouse
Logitech K800 Lian Li PC-Q05B Logitech M570 
CPUMotherboardGraphicsRAM
Core i7-860 Gigabyte GA-H55N-USB3 EVGA GTX 460 1GB GDDR5 Kingston 2x4GB DDR3 1333 
Hard DriveOSPowerCase
G.SKILL Phoenix Pro 120GB Windows 7 Ultimate x64 Silverstone ST45SF 450W Silverstone Sugo SG05B 
CPUMotherboardGraphicsRAM
Core i7-860 Biostar TH55B HD MSI GT 240 1GB GDDR5 Kingston 2x2GB DDR3 1333 
Hard DriveOSMonitorPower
Intel X25-M 120GB Windows 7 Ultimate x86 Samsung 22" Antec EA-380D 
Case
Rosewill R101-P-BK 
  hide details  
Reply
Garnet
(11 items)
 
Lucifiel
(13 items)
 
Metatron
(13 items)
 
CPUMotherboardRAMHard Drive
Intel Core i5-3450S Intel DQ77KB Corsair 16GB DDR3 1600 SO-DIMM Samsung 830 256GB 
Hard DriveHard DriveCoolingOS
Crucial m4 256 mSATA Samsung 840 500GB Intel BXHTS1155LP Windows 7 Ultimate x64 
KeyboardCaseMouse
Logitech K800 Lian Li PC-Q05B Logitech M570 
CPUMotherboardGraphicsRAM
Core i7-860 Gigabyte GA-H55N-USB3 EVGA GTX 460 1GB GDDR5 Kingston 2x4GB DDR3 1333 
Hard DriveOSPowerCase
G.SKILL Phoenix Pro 120GB Windows 7 Ultimate x64 Silverstone ST45SF 450W Silverstone Sugo SG05B 
CPUMotherboardGraphicsRAM
Core i7-860 Biostar TH55B HD MSI GT 240 1GB GDDR5 Kingston 2x2GB DDR3 1333 
Hard DriveOSMonitorPower
Intel X25-M 120GB Windows 7 Ultimate x86 Samsung 22" Antec EA-380D 
Case
Rosewill R101-P-BK 
  hide details  
Reply
post #14 of 14
Quote:
Originally Posted by subassy View Post
I actually work in a datacenter myself. We use $700+ 3Ware (and some adaptec) cards and indeed they very rarely fail.

When they do, at least in the case the 3W ones, they have to have the model of card at the very least. You're right, i'm probably too concerned about the firmware version. The concern over it at work I think has to do with the company-specific scripts and other processes as much as anything. The company I work for also has multi-million dollar contracts for a supply of controllers and a speedy RMA process.

But what about sub-$100 consumer RAID cards? Or the controller chips on motherboards? I'm not saying they're likely to fail but if the mobo is 4 years old and that one chip dies or otherwise starts to malfunction i can't exactly buy another of the same board and it's out of RMA period. Maybe it should all be mirrored to another device anyway but it seems like being able to connect anyone of the drives to another mobo's sata port and see the data has as much advantage as anything...?
I've transferred arrays between 8006, 9500 and 9650 cards without issue. Wouldn't do it at work with client data, but I'd have no problems trying it at home (but then I do have a backup of anything important).

The Intel controllers are also backwards (and forwards) compatible from the ICH7R onwards (and I believe the ICH5R on, but I haven't tested that).
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Servers
Overclock.net › Forums › Specialty Builds › Servers › Confused about raid