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raid 0 or raid 5?

post #1 of 19
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hi, i have 5 120gb ssd and i want to do raid 0 for best performance. but i am also scared of data loss. Is there anyway i can backup my files constantly to avoid losing my data? I heard raid 5 will use one ssd for a backup? i dunno, what you guys think i should do?
post #2 of 19
Raid 1+0. Performance + reliability?
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post #3 of 19
Quote:
Originally Posted by Skyy View Post
hi, i have 5 120gb ssd and i want to do raid 0 for best performance. but i am also scared of data loss. Is there anyway i can backup my files constantly to avoid losing my data? I heard raid 5 will use one ssd for a backup? i dunno, what you guys think i should do?
RAID 1+0 or RAID10, they are one and the same. It's a Stripped array that is also mirrored. This is a much lighter raid as there is no parity to be calculated as there is in raid 5. Raid 10 required 4 drives.

http://www.integratedsolutions.org/raid_ov.htm
 
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post #4 of 19
Quote:
Originally Posted by Skyy View Post
hi, i have 5 120gb ssd and i want to do raid 0 for best performance. but i am also scared of data loss. Is there anyway i can backup my files constantly to avoid losing my data? I heard raid 5 will use one ssd for a backup? i dunno, what you guys think i should do?
Honestly I have never had an SSD fail and I have been using them since I could get my hands on them. I don't see too much risk for running them in Raid0.

Edit: I think you best bet is to install your OS on 1 Drive and then run two separate Raid0 arrays on the remaining 4 drives.
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post #5 of 19
as above, raid 0+1,
post #6 of 19
Quote:
Originally Posted by tconroy135 View Post
Honestly I have never had an SSD fail and I have been using them since I could get my hands on them. I don't see too much risk for running them in Raid0.
I have to stop you there i have a Crucial 128GB M225 that failed on me. Was faster then the one i have in my ASUS now but it wan't compatible with the Laptop at the time. Now i wonder if it was faulty them.... anyway they do fail. after all are similar to ram and Flash drives (i'm being general here in the basic of operation) and those fail from time to time.

I know i'm going to be flamed about my above reference. I'm just trying to compare it to something else that is relatively "SOLID".

**Cringes for the back lash**
 
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post #7 of 19
Quote:
Originally Posted by Skyy View Post
hi, i have 5 120gb ssd and i want to do raid 0 for best performance. but i am also scared of data loss. Is there anyway i can backup my files constantly to avoid losing my data? I heard raid 5 will use one ssd for a backup? i dunno, what you guys think i should do?
RAID is for redundency and not for backups.
Redundency is the ability to continue working in case of failure.
Backup is the ability to retrieve data in case of failure.


First off, what RAID controller and SSDs are you using? You might be bottlenecked.

Second, what data is on the SSD? You might not be benefiting from RAID much.

You might be better off going with a smaller array and daily backup to a hard drive might suffice.

You do NOT want to go with onboard RAID5. The parity overhead will kill your SSD performance.
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post #8 of 19
Quote:
Originally Posted by DuckieHo View Post
You do NOT want to go with onboard RAID5. The parity overhead will kill your SSD performance.
Its not going to kill it that bad not with five of them, write speeds may drop to 2-3 SSD RAID 0 level with five in RAID 5. The read speeds will remain fast.
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post #9 of 19
Quote:
Originally Posted by PeterUK View Post
Its not going to kill it that bad not with five of them, write speeds may drop to 2-3 SSD RAID 0 level with five in RAID 5. The read speeds will remain fast.

Are you sure? The bottleneck is with the parity calculations and not the drives themselves. Assuming a host-based controller, the sequential writes will be sub-100MB/s while the sequential reads should be near [n-1]. However, the random write performance should be pretty bad since each block requires to wait for a free CPU cycle.
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post #10 of 19
Quote:
Originally Posted by DuckieHo View Post
Are you sure? The bottleneck is with the parity calculations and not the drives themselves. Assuming a host-based controller, the sequential writes will be sub-100MB/s while the sequential reads should be near [n-1]. However, the random write performance should be pretty bad since each block requires to wait for a free CPU cycle.
CPU's today do this parity calculation in their sleep.

As long as you have write-back cache to handle Multiple I/O requests so that they may be grouped together to push more data on to the SSD's the speeds should be fine.

And with all that going on random write performance will still be better then five HDD's in RAID 5 with sequential writes at maybe getting upto 200MB/s thats random data and it maybe faster with Garbage Collection with five SSD's.
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