Yes, Raid 1 is mirroring - Raid 0 is "striped" In Raid 1 (with 2 drives) each drive is an exact copy of the other. If one fails you can recover your data from the other.
Raid 0 the data is spread across both drives in such a way that you (almost) double the transfer rate (you can't do much about seek times). Raid 5 (I think) is similar to striping, except that you have one additional drive which acts as parity. This means that if any one drive fails you can still recover (even hot swap it out if you spend enough money). There are other forms or Raid with additional redundancy - what happens if two drives fail? They might even support error correction (not just detection). Some people recommend being able to handle two simultaneous drive failures because drives manufactured at the same time seem to fail at the same time (high marks for consistency of quality). Alister Christie Computers for People Ph: 04 471 1849 Fax: 04 471 1266 http://www.salespartner.co.nz PO Box 13085 Johnsonville Wellington Conor Boyd wrote: > Is Raid 0 basically mirroring? > > 'cos that's what I've got on my Dell 2.66GHz dual-core with 3GB of RAM, > and it's pretty snappy. > > My understanding of the mirroring is that for disk-reads especially it > should help quite a lot, since the disk controllers can read half the > file from each of the 2 disks, thereby cutting your read times fairly > significantly. > > I don't know if it's actually possible to buy single core CPUs anymore? > Compared to when I used to run virtual machines on a single core CPU, > duals are essential for anything like that. > > C. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Alister > Christie > Sent: Monday, 30 March 2009 9:54 a.m. > To: NZ Borland Developers Group - Offtopic List > Subject: Re: [DUG-Offtopic] new PC > > On the subject SATA Raid, my home machine has a couple of drives > configured in Raid 0 - and the machine seems really snappy. I would > certainly agree that Raid is an excellent way of boosting your machines > performance for not much extra overall cost. You may find Raid 0 a bit > unreliable (which reminds me - I should do a backup) for a work machine > - but you could go for Raid 5 (with 3 or more drives). > > It somewhat sucks to be buying a new machine at the moment because of > the value of the NZ dollar. The CPU I purchased 3 or 4 months ago is > actually more expensive now (a 3GHz Core 2 Duo). > > I guess any recommendation is going to come down to how much (or little) > you want to spend. > > Jeremy Coulter wrote: > >> HI all. >> I am about ready to finally replace me 3GHz HT machine ! Its been a >> good old work horse, but its getting on now and needs a complete >> rebuild, but I figure I might as well build a new machine. >> >> What are people using these days? >> >> I am thinking I might run a thin linux install with VMWare for Vista >> and XP. >> My reason for this was that I am thinking of putting res. amount of >> RAM in, maybe 8GB so my VM's would run res. speedy and thought Linux >> and vmware might let me utilise this amount of RAM better. >> However, I am also aware that Vista would be able to use this much ram >> > > >> too so I could still use Vista and VMware for XP. >> I would still prodomintaly use XP for development etc rather than >> Vista as most of our client have XP and we have sorted out our Vista >> issues so I dont need to run it day to day. >> >> I will use SATA Raid, thats a given, but what about CPUs? >> Should I go for a quad core or a dual core? >> >> I have kinda been out of the hardware side of things for about 1.5 >> years now and have not really kept up.....to my shame ;-) >> > > _______________________________________________ > NZ Borland Developers Group Offtopic mailing list > Post: [email protected] > Admin: http://delphi.org.nz/mailman/listinfo/offtopic > Unsubscribe: send an email to [email protected] with > Subject: unsubscribe > > _______________________________________________ NZ Borland Developers Group Offtopic mailing list Post: [email protected] Admin: http://delphi.org.nz/mailman/listinfo/offtopic Unsubscribe: send an email to [email protected] with Subject: unsubscribe
