Re: Out-of-order writing by disk drives

[Folkert van Heusden]

>> A full listing of what devices do and don't support barriers would
>> be likely very long. You would actually need to list down to hard disks.
>>
>> A common problem is barriers over LVM. Since 2.6.29 they work
>> with a single device (and if the underlying device supports it) with  
>> dm linear, but not in any other LVM setup.
> ..
>
> Does anyone else here find this rather peculiar?
> The folks who actually care about barriers the most
> (apart from kernel developers) are probably enterprise users.
> And who is most likely to be using RAID and LVM,
> where barriers generally don't work at all ?

What about iSCSI? Does it support barriers?


Folkert van Heusden

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