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Use a normal disk drive for parity with 2 SSDs in RAID 5??

post #1 of 16
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Title may be confusing, But would it work to get two SSD drives and one hard disk drive, and build a raid 5 array with the non SSD drive doing parity? or do the speeds need to match
post #2 of 16
Speeds don't NEED to match, though, your raid array will only go as fast as your slowest component.
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post #3 of 16
i wouldnt raid SSD drives simply because of lack of trim support.
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post #4 of 16
Quote:
Originally Posted by timma100 View Post
Title may be confusing, But would it work to get two SSD drives and one hard disk drive, and build a raid 5 array with the non SSD drive doing parity? or do the speeds need to match
The parity needs to be on all drives, it is a stripe, to tell the other drives what is missing when a drive fails so it can rebuild from the other 2. Having 1 drive with the parity would be useless. If the parity drive failed you would have a dead container.... If you want to do something like that, then just do raid 0.
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post #5 of 16
Quote:
Originally Posted by timma100 View Post
Title may be confusing, But would it work to get two SSD drives and one hard disk drive, and build a raid 5 array with the non SSD drive doing parity? or do the speeds need to match
Why don't you go raid 0 + backup disk instead? You just need a backup software like the one integrated in Windows, you tell when to backup and you're done. I do like this for my SSD and I'm planning to do so also for my entire PC, a JBOD of 2x 2tb greens is pretty cheap now and can backup pretty much ANYTHING.
     
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post #6 of 16
Quote:
Originally Posted by SHNS0 View Post
Why don't you go raid 0 + backup disk instead? You just need a backup software like the one integrated in Windows, you tell when to backup and you're done. I do like this for my SSD and I'm planning to do so also for my entire PC, a JBOD of 2x 2tb greens is pretty cheap now and can backup pretty much ANYTHING.
Sounds like a good plan to me.....
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post #7 of 16
Quote:
Originally Posted by MrAMD_Fan View Post
The parity needs to be on all drives, it is a stripe, to tell the other drives what is missing when a drive fails so it can rebuild from the other 2. Having 1 drive with the parity would be useless. If the parity drive failed you would have a dead container.... If you want to do something like that, then just do raid 0.
Well, RAID-4 does exist and that's exactly what it does. Data disks are striped and a separate disk is used for parity. If the parity drive fails, you'd still have your data intact. If one of your data disks fails, then you can rebuild it from parity (+remaining data disks in the array of course). The point of RAID-5 is so no single disk gets hammered and you get better performance since parity is spread across the disks (ergo, more balanced load).

Quote:
Originally Posted by SHNS0 View Post
Why don't you go raid 0 + backup disk instead? You just need a backup software like the one integrated in Windows, you tell when to backup and you're done. I do like this for my SSD and I'm planning to do so also for my entire PC, a JBOD of 2x 2tb greens is pretty cheap now and can backup pretty much ANYTHING.
+1. Best way to go about it.
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post #8 of 16
Quote:
Originally Posted by rui-no-onna View Post
+1. Best way to go about it.
Indeed. RAID, redundancy, parity and stuff like that are good only for servers and business computers with a continuous flow of sensible data. For every single end user in this goddamn world, a daily backup is more than enough.
If you have for example 2x 120gb SSDs, it would be better and less expensive to get a 2TB green drive only for backups instead of a 3rd SSD for RAID5. First of all, because your 2 SSDs can now go in raid 0 and therefore can be faster, and second because the rest of the 2TB drive can be used to backup even other drives.
     
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post #9 of 16
Quote:
Originally Posted by SHNS0 View Post
Indeed. RAID, redundancy, parity and stuff like that are good only for servers and business computers with a continuous flow of sensible data. For every single end user in this goddamn world, a daily backup is more than enough.
I'd agree except it's somewhat expensive to do 1:1 backup of 12TB worth of data (for now, at least until HDD's drop in price again). For my use and type of data stored (Blu-ray, HD-DVD, DVD rips) JBOD+parity works better.

Granted, I do have photos, etc, on both Dropbox and Amazon S3 (Jungle Disk). The music collection, I'm still debating on whether to store "in the cloud" or not.
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post #10 of 16
Quote:
Originally Posted by rui-no-onna View Post
I'd agree except it's somewhat expensive to do 1:1 backup of 12TB worth of data (for now, at least until HDD's drop in price again). For my use and type of data stored (Blu-ray, HD-DVD, DVD rips) JBOD+parity works better.

Granted, I do have photos, etc, on both Dropbox and Amazon S3 (Jungle Disk). The music collection, I'm still debating on whether to store "in the cloud" or not.
I'd call that a server
Do you have 12TB on JBOD? Honestly, I'd raid 5 em.

Hell, I'd even raid 6 em.
     
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