A8 Parts Forum  

Go Back   A8 Parts Forum > General Natter > IT, AV and other Tech

IT, AV and other Tech All computing, home cinema and technology that isnt car related

Reply
 
Thread Tools Display Modes
  #1  
Old 16th October 2015, 07:18 PM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,013
Default One for IT guys

I was going to ask this in one of IT forums I am member off, but they have issue that I cannot login at the moment so here it goes:

I have currently setup Dell Poweredge 2950 server with 2x quad Xeon processors running 3x2TB in Raid 5 +1x 2TB hot spare but this is overkill for my needs and I am downsizing to HP Microserver Gen8 to reduce power costs. Currently it costs me 250-300 in electricity per year and I am expecting it to be 30-50 per year on HP Microserver. While I do like RAID 5 unfortunately HP Microservers do not support it so my choices are 0, 1, 1+0 or 0+1. I know that if I was using 4 disks it would be best to use 1+0 instead of 0+1 for reliability but I am using 1 bay for OS drive so only have 3 available. My idea is to use 2 of old 2TB drives in RAID 0 and sell the other 2, get another 4TB drive and do RAID 1 between single 4TB drive and 2x2TB Raid 0 array. Important data is backed up on another external drive anyway and very important backed up in several places including cloud.

Does it sound like a sensible idea or not.


PS if anybody would be interested in Dell Poweregde 2950 with 2x E5450 Quad core Xeon processors, 16GB of RAM, Perc 6i Raid card let me know as it will be available after I complete migration.
__________________

1997 S8 was Cat B write-off in 2007 but still going strong
Reply With Quote
  #2  
Old 16th October 2015, 08:07 PM
Adrian E's Avatar
Adrian E Adrian E is offline
Senior Member
 
Join Date: Dec 2010
Location: Gatwick area
Posts: 3,595
Default

Might depend what software you're running on the hp microserver. Mine's running x4 3 TB WD reds plus a small HDD with the os (openmediavault) and is running RAID5 (about 8TB total)

If you get a cheap 5.25 to 3.5" drive caddy you can use the optical slot in the top for the os drive
__________________
===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===

2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus

2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
Reply With Quote
  #3  
Old 16th October 2015, 08:09 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,864
Default

I've just setup a Microserver Gen8 at home, from what I can work out from my smart meter its consuming about 85watts of power running 4 HDDs, a single SSD in the ODD bay and upgraded to 16GB Ram.

I've gone down the VM route and running ESXi6 free version which is booting from a USB Stick plugged into the internal USB port. It also has an internal MicroSD slot which can boot ESXi.

I've got 4 drives, 2 WD Red NAS 2TB drives stripped only and 2 Seagate drives also stripped only. I have a good backup routine of off and onsite backups to backup my 900GB of data using USB3 drives for speed.

This is a good source of info on the GEN8
http://homeservershow.com/forums/ind...m/88-ms-gen-8/
__________________
Manny

2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 164K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 185K miles.
Past 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #4  
Old 16th October 2015, 08:13 PM
moltuae's Avatar
moltuae moltuae is offline
Senior Member
 
Join Date: Sep 2014
Location: East Lancs.
Posts: 1,954
Default

Well, firstly I wouldn't bother with RAID 5 even if it was an option. RAID 5 pretty much became useless several years ago once drive capacities began exceeding 2TB:
http://www.zdnet.com/article/why-rai...rking-in-2009/

For my business customers, where possible I always choose RAID 10 or RAID 1, especially for mission-critical servers. The reason for using mirrored RAID arrays of course is to provide fault tolerance. In other words, it's a convenience thing, rather than a 'backup', to reduce down-time in the event of a drive failure.

So, it depends on how mission-critical your system is. If reducing down-time was an important factor, I'd use a pair of drives in RAID 1 and perhaps keep the remaining bay as a hot swap, backup drive or just extra storage for less important files. If, on the other hand, down-time was less important than storage capacity, I'd probably use 3 drives in RAID 0. As long as everything is backed up, a failed drive just means the server is going to be down for a while until you've replaced it and recovered from backups.

Also, how are you calculating the power consumption comparisons? I would be surprised if the difference is that great.


How much would you be looking to sell the Poweredge for? And does it come with dual PSUs and rack rails?
__________________
Mark
------------------------------------------------------
2002 FE S8 Ebony Black Pearl
------------------------------------------------------

------------------------------------------------------
Cars Owned:

The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
Reply With Quote
  #5  
Old 16th October 2015, 08:13 PM
Delboy's Avatar
Delboy Delboy is offline
Senior Member
 
Join Date: Aug 2013
Location: Lowestoft, Suffolk
Posts: 2,442
Default

And people say i'm a geek

Keep it up though, I love it and always like new ideas.

Marcin gave me plenty today about home security.
__________________
Del

Reply With Quote
  #6  
Old 16th October 2015, 08:28 PM
mattylondon mattylondon is offline
Senior Member
 
Join Date: Apr 2014
Location: Norwich & L'viv
Posts: 1,613
Default

For my home file server I run a ZFS pool. Back up is made using Rsync to a separate pool in the same server; and Rsync to a remote server; and a portable HD. 4 copies of all files and all nice and simple
__________________
Matt

2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
Reply With Quote
  #7  
Old 16th October 2015, 08:52 PM
Delboy's Avatar
Delboy Delboy is offline
Senior Member
 
Join Date: Aug 2013
Location: Lowestoft, Suffolk
Posts: 2,442
Default

clearly i need to come bavl and read this when im sobber, i know my nax is raid 5. so the big wuestion is what should i be doinf ?
Quote:
Originally Posted by moltuae View Post
Well, firstly I wouldn't bother with RAID 5 even if it was an option. RAID 5 pretty much became useless several years ago once drive capacities began exceeding 2TB:
http://www.zdnet.com/article/why-rai...rking-in-2009/

For my business customers, where possible I always choose RAID 10 or RAID 1, especially for mission-critical servers. The reason for using mirrored RAID arrays of course is to provide fault tolerance. In other words, it's a convenience thing, rather than a 'backup', to reduce down-time in the event of a drive failure.

So, it depends on how mission-critical your system is. If reducing down-time was an important factor, I'd use a pair of drives in RAID 1 and perhaps keep the remaining bay as a hot swap, backup drive or just extra storage for less important files. If, on the other hand, down-time was less important than storage capacity, I'd probably use 3 drives in RAID 0. As long as everything is backed up, a failed drive just means the server is going to be down for a while until you've replaced it and recovered from backups.

Also, how are you calculating the power consumption comparisons? I would be surprised if the difference is that great.


How much would you be looking to sell the Poweredge for? And does it come with dual PSUs and rack rails?
__________________
Del

Reply With Quote
  #8  
Old 16th October 2015, 09:27 PM
HPsauce HPsauce is offline
Senior Member
 
Join Date: Sep 2011
Location: About 250m from HS2!
Posts: 6,360
Default

Surely the type of RAID you chose depends on what you want to achieve, e.g. performance, redundancy, fast-fix, rapid recovery etc.
Some while since I bothered with this, but the servers I last was "responsible" for were all at least RAID 5 with hot-swap drives, mainly Dell kit.
So if anything failed you just yanked it out and plugged a replacement in while still running. The array was then rebuilt automatically at a hardware/firmware level.

IIRC there was another variant (can't recall which) that was secure against a 2-drive failure. We used that on really critical stuff. My excuse is that I was an IT manager/director not a techie!
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
Reply With Quote
  #9  
Old 16th October 2015, 10:24 PM
Adrian E's Avatar
Adrian E Adrian E is offline
Senior Member
 
Join Date: Dec 2010
Location: Gatwick area
Posts: 3,595
Default

I can see the point Mark is making - if the typical read error rate of a large capacity drive is inevitably higher than the error rate that a RAID array can cope with rebuilding from, you're doomed to fail....

Mine's basically a media server for TV/music/films that happens to maintain backups of my desktop and laptop, so there's nothing critical on there. I guess RAID 5 with a load more discs reduces the chances of a failed drive causing a failed rebuild as the missing data may be on another drive?

Just replaced the desktop HDD with a 4TB WD Black due to running short of space! Elsawin takes up a shed load....

At some point I really should sort out a cloud based/off site backup option, given a house fire would lose us everything digital!
__________________
===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===

2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus

2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
Reply With Quote
  #10  
Old 17th October 2015, 08:10 AM
moltuae's Avatar
moltuae moltuae is offline
Senior Member
 
Join Date: Sep 2014
Location: East Lancs.
Posts: 1,954
Default

Quote:
Originally Posted by Delboy View Post
clearly i need to come bavl and read this when im sobber, i know my nax is raid 5. so the big wuestion is what should i be doinf ?
Sai Wut?


Well, as long as you have backups, I wouldn't worry about it too much. Essentially, the problem with RAID 5 is that, by the nature of how it works, the amount of data that has to be written to rebuild an array of large capacity drives (>2TB) after a replacing a failed drive, exceeds that of the theoretical failure rate of most mechanical drives. Therefore, the chances of further data write failures during rebuild becomes likely.

In enterprise environments, most systems administrators have known about the dangers of RAID 5 for years so it's relatively uncommon. For residential use, RAID 5 is still surprisingly popular, but then having a server/NAS fail in a home-setup will probably be nothing more than inconvenient.

You do have to remember that RAID data mirroring is a convenience thing. Some people confuse the data mirroring aspect of it with backing up, which of course it's not. Everything is mirrored between drives, including corruptions and all deletions (be it intentional or malicious).

RAID 1/10 is generally considered 'best practice' amongst most IT professionals who work with medium to large businesses. For my server setups, I generally have a pair of SSDs in RAID 1 for the Operating System and RAID 10 for both the internal storage and NAS/SAN external storage and backup devices. Rarely do the severs or storage devices I install have any less than 4 bays though.

If you have less than 4 bays available, and you need the convenience of being able to swap-out a failed drive with little-to-no down-time, I'd recommend RAID 1. If you don't need that convenience, RAID 5 is fine, though bear in mind that it (theoretically at least) provides little more fault tolerance than RAID 0.

Quote:
Originally Posted by HPsauce View Post
Surely the type of RAID you chose depends on what you want to achieve, e.g. performance, redundancy, fast-fix, rapid recovery etc.
Precisely.
__________________
Mark
------------------------------------------------------
2002 FE S8 Ebony Black Pearl
------------------------------------------------------

------------------------------------------------------
Cars Owned:

The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 09:33 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.