RAID 10 is one of the most expensive RAID levels as you loose about half your storage, it is good though if you need performance and redundancy at the same time. We have been using RAID 10 setups for database servers etc
Another vote for never using software RAID, grab an affordable/reliable hardware RAID card to ensure reliability and data integrity. Generally Adaptec or 3Ware, though there are others, those are just my personal choices.
It seems that many people had misunderstood what I meant. I want to know if software RAID 10 is safe to use compared to the usual software RAID 1, as AFAIK, you need to tweak in order to get software RAID 10.
Edit: No hardware RAID please. I don't see the need, as it isn't important.
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I don't see what's the big deal with NOT using SW RAID. In my 3+ yrs dealing with ZFS and Linux mdadm, I never had problems with it. I also like to point out a HW RAID card without a BBU is kind of pointless, IMHO. I've dealt with LSI-based, Adaptec-based IBM/DELL RAID controllers before. The BBU usually end up cost more than the RAID card itself. Few weeks ago I had to purchase SR-MR10i w/ BBU ($740) to replace non-BBU SR-BR10i on few IBM x3550 M2s. It was expensive.
We have a on-going project deploying staging ZFS for tier 2/3 clients. Instead of carving out LUNs out of expensive LSI SAN. SunFire X4240 is pretty badass. When clients decides to pay more and upgrade, putting them on multipath SAN is not a problem.
I've replaced quite a few bad drives based on mdadm RAID arrays & ZFS before. Not once I had problems with it.
Just my .02.
SysAdmin.xyz Having severs with customer data on it without proper monitoring is like having one night stand without using protections - eventually, there will be an 'oh s**t!' moment.
I've experienced loads of hardware raid card failures, resulting in bad experience of recovering old or corrupt or just no data after the event.
Software raid, never had a problem at all and is most valid for most general applications unless you absolutely need everything out of your quad core cpu's, which generally isn't the case. Unless you've actually done software raid en masse, don't assume it's performance inhibitive, opposed to hardware raid cards. You actually should give it a whirl and see for yourself. Just because everyone on here poo-poo's it, don't make it so.
Software Raid thumbs up from here, and Opensolaris ZFS rocks too.