Re: [Xen-users] Cheap IOMMU hardware and ECC support importance

[lee <lee@xxxxxxxxxxxxxxx>]

Kuba <kuba.0000@xxxxx> writes:

> W dniu 2014-06-28 09:45, lee pisze:
>
>> I don't know about ZFS, though, never used that.  How much CPU overhead
>> is involved with that?  I don't need any more CPU overhead like comes
>> with software raid.
>>
>
> ZFS offers you two things RAID controller AFAIK cannot do for you:
> end-to-end data checksumming and SSD caching.

There might be RAID controllers that can do SSD caching.  SSD caching
means two extra disks for the cache (or what happens when the cache disk
fails?), and ZFS doesn't increase the number of SAS/SATA ports you have.

How does it do the checksumming?  Read everything after it's been
written to verify?

I'll consider using it next time I need to create a file system.


-- 
Knowledge is volatile and fluid.  Software is power.

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