On Oct 10, 2005, at 9:39 AM, Pavel Cahyna wrote:

> On Mon, 10 Oct 2005 08:39:51 -0700, Bill Studenmund wrote:
>
>>> There has been several patches around for yonks that fixes these  
>>> issues but
>>> they were never integrated. Our msdosfs f.e. doesn't support non 512
>>> bytes/sector devices. Filingsystems DO change on sectorsize and  
>>> devices
>>> like DVD/CD+-(M)R(W) can't just do read-modify-write cycle to  
>>> cope with
>>> blocksizes smaller than the sector size.
>>
>> Our device drivers don't support read-modify-write operations now;  
>> all
>> reads and writes have to be a multiple of the underlying sector size.
>
> What about raidframe? Doesn't RAID5 require read-modify-write  
> operations?

Only if the file system isn't doing stripe-aligned I/O

>
> Pavel

-- thorpej