Raid 1 Controller Suggestions


I have a Dell Poweredge 840 as file server with 160 GB SSD. I am planning to add another SSD to make it a RAID 1. Do we have any RAID 1 PCI Controller that supports TRIM command? I am looking for something around $200.
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Davis McCarnOwnerCommented:
Apparently, even today; because RAID1 turns the drives into a single storage volume, the O/S stops issuing trim commands.  However, the Intel DC S3700 series of SSD's use an internal feature called "garbage collection" which is very similar to trim and overcomes the problem of having 2 SSD's in a RAID1 configuration:
My suggestion is a strong DON'T BUY ANY RAID1 CONTROLLER for a SSD.   Use the native host-based software RAID.   The reason is that that any controller qualified for SSDs in RAID1 require specific SSDs, and those controllers themselves won't buy you any performance gain on RAID1.  

The low-end controllers, and especially fake-raid controllers will severely diminish throughput.  They won't align I/Os properly and won't handle TRIM.   They may not even do load balancing.   I seriously doubt your 160GB SSD is qualified for any RAID controller to begin with.

The O/S based RAID1 will do read load balancing, so in a perfect world, you'll get 2X read performance.

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andyalderSaggar maker's framemakerCommented:
Agree with dlethe, use software RAID for SSDs. Look at LSI MegaRAID FastPath - you buy an expensive LSI controller, then buy a fastpath license for it that enables it to bypass most of the hardware RAID and do it with the software driver instead. HP do the same but call it Smart Path.
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