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Old 02-09-2009, 03:48 AM   #1
kool_kid
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Virtual Private Server: To go with RAID 5 or Not?


Hi,

We are planning to implement Virtual Private Server (VPS, now when installing host OS should we use RAID 5 or not is my concern.

Any negatives that anyone see in it? I know only of one that is 3 outta 4 hdd's will be usable when we implement RAID5. Anything else anyone know of?

Thanks for answering in advance.
 
Old 02-09-2009, 03:56 AM   #2
acid_kewpie
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RAID 5 can be quite limiting. You can't easily add another drive or such, whereas whilst it uses more drives, you can easily add additional pairs of drives to a raid 1+0 or Raid 1 + LVM implementation
 
Old 02-09-2009, 04:06 AM   #3
kool_kid
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That was a good point on which I didn't ponder. Thanks, anymore points guys?
 
Old 02-09-2009, 06:59 AM   #4
r3sistance
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I would avoid any LVM implementations, while it allows you to resize partitions, if the LVM corrupts during resize, it corrupts on all mirrors and so removes your redundancy in a single blow. But then it's always good to remember that raid mirrors, mirror mistakes. How many discs is your physical server limited too anyway? Raid 5 can not be increased in size live, but it's implemention will allow for any number of discs over... 3 I believe, also alot of hardware implemention work well with hot spares to rebuild failed discs live, not sure if RAID 10 offers this same functionality. RAID 10 vs 5 issues often come down to vendor implementations. Also if you have a RAID 10 you can not add single discs, you have to add full raid 1s to your raid 0, this would require rebuilding as it goes anyway since the stripes would have to be distributed across the raid 0. You can still add a raid 1 next to a raid 5, or even add a raid 5 next to a raid 5.

Personally I think the idea of changing raid layouts live is not a good idea anyway, it's good to go with a solid raid layout that has one or two hotspares (depending on size of the array) incase of disc failure, to instantly restore any lost redundancy.

Last edited by r3sistance; 02-09-2009 at 07:00 AM.
 
Old 02-10-2009, 01:29 AM   #5
kool_kid
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Firstly Thanks for your suggestions.

My server is limited to 8 disc. I have 4 used on which im planning for RAID. In future we can use the rest 4.
 
  


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