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post #11 of 33
Yeah, it's not the RAID1 implementation... it's the disks.

Get some RAID1 SSDs and they will be fine since they increases the IOPs by two magnitudes!
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post #12 of 33
I agree that the SSDs would increase performance phenomenally...since a pair of 7200 Spindle drives have around 150 IOPS, where a pair of SSDs would be over 50,000 IOPS.

However, depending on the size of the array and the size of the disks needed, SSDs may not be cost effective. In any case, I would recommend 10K or 15K SAS disks in a RAID 10.
post #13 of 33
Hardware RAID on a dedicated card can also be moved from one machine to another without breaking the array. A good thing IMO.
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post #14 of 33

Quote:

Originally Posted by tycoonbob View Post

I agree that the SSDs would increase performance phenomenally...since a pair of 7200 Spindle drives have around 150 IOPS, where a pair of SSDs would be over 50,000 IOPS.

However, depending on the size of the array and the size of the disks needed, SSDs may not be cost effective. In any case, I would recommend 10K or 15K SAS disks in a RAID 10.

 

With a 600GB 15k SAS drive at ~$400 and a 256GB SSD at ~$200 I'd find it very hard to agree with you on a cost/GB ratio alone.  And when you consider the $/IOPS ratio it's a no brainer.

 

Quote:

Originally Posted by 2thAche View Post

Hardware RAID on a dedicated card can also be moved from one machine to another without breaking the array. A good thing IMO.

 

So can a software array on *nix.  Very little difference in moving an array to setting one up from scratch.


Edited by the_beast - 2/16/13 at 5:22am
post #15 of 33
Quote:
Originally Posted by the_beast View Post

With a 600GB 15k SAS drive at ~$400 and a 256GB SSD at ~$200 I'd find it very hard to agree with you on a cost/GB ratio alone. And when you consider the $/IOPS ratio it's a no brainer.

Where are you buying your SAS drives from? You can get 600GB 15K Seagate Cheetahs, as well as Hitachi Ultrastars for $200-250. HP and Dell branded drives aren't that much more either. Your comparison is also enterprise vs consumer. When using consumer SSDs with something that is getting over 800GB of writes a day, a SAS drive will last much longer. Enterprise SSDs are much more expensive, and in this case is all I would recommend. From the sounds of it, this isn't some little home hosted website. 800GB of Database writes per day, and over 200,000 users? Reliability and uptime is a must.
post #16 of 33
Thread Starter 
@thread

Yeah I don't think consumer SSDs will last too long under those conditions. I understand the_beast's point about treating them as almost throw away items, but since they'd be run under Linux, there'd be no way to know how much life is in them, since Linux doesn't support those utilities (yet), therefore it would be impossible to accurately predict the replacement schedule.

I think if they were used only as a cache, they might last longer but unless the kernel gives up enough information about their lifespan, again it will be difficult to know when to replace them.
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post #17 of 33
Quote:
Originally Posted by parityboy View Post

@thread

Yeah I don't think consumer SSDs will last too long under those conditions. I understand the_beast's point about treating them as almost throw away items, but since they'd be run under Linux, there'd be no way to know how much life is in them, since Linux doesn't support those utilities (yet), therefore it would be impossible to accurately predict the replacement schedule.

I think if they were used only as a cache, they might last longer but unless the kernel gives up enough information about their lifespan, again it will be difficult to know when to replace them.

Doesn't really matter about expected wear expectancy... when they wear out, just replace them. Consumer SSDs are required to maintain readability for 1 year after a cell wears out.
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post #18 of 33
Thread Starter 
@DuckieHo

So the cell damage would affect writes first? Also, is there an (at least vague) rule of thumb you can use to replace an SSD, if you can't get the needed info from it? Will the SMART spec be extended to include SSD features?
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post #19 of 33
Quote:
Originally Posted by parityboy View Post

@DuckieHo

So the cell damage would affect writes first? Also, is there an (at least vague) rule of thumb you can use to replace an SSD, if you can't get the needed info from it? Will the SMART spec be extended to include SSD features?

 

Cell damage pretty much only affects writes - once the cell is damaged you can no longer clear a cell to alter it's state.  The cells remain readable throughout.

 

You don't really need to monitor the SSDs directly - your RAID card (or linux if under software RAID) can email you once the first cell fails to write, as it will trigger as a failed drive in the array.  And since you're running RAID1 your system will continue operating as you replace the drive & rebuild - if you like at this point you can then replace the other drive as well (which is what I would recommend you do, as they will both be suffering very similar write patterns).

 

 

Quote:
Originally Posted by tycoonbob View Post

Where are you buying your SAS drives from? You can get 600GB 15K Seagate Cheetahs, as well as Hitachi Ultrastars for $200-250. HP and Dell branded drives aren't that much more either. Your comparison is also enterprise vs consumer. When using consumer SSDs with something that is getting over 800GB of writes a day, a SAS drive will last much longer. Enterprise SSDs are much more expensive, and in this case is all I would recommend. From the sounds of it, this isn't some little home hosted website. 800GB of Database writes per day, and over 200,000 users? Reliability and uptime is a must.
 

Where are you buying your SAS drives?  In the UK I can't buy a warrantied HP 600GB SAS drive for close to that.  And I'm buying them internally...


Edited by the_beast - 2/17/13 at 8:44am
post #20 of 33
Thread Starter 
@tycoonbob

Scan Computers are selling 600GB Seagate Savvio 10K RPM 2.5" drives for £264/$409. The 15K RPM 600GB 3.5" model sells for £249/$386. UK prices...
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