RAID SYNC

RAID SYNC

[Mikael Chambon]

Hi Again,

My second question is about RAID sync.

Just for my curiosity, I am testing RAID1 on two empty 110 gig partitions, 
the system takes about 3h30 to resync, why is it taking so long ?

Here is my idea: As the RAID layer has nothing to do with the FS layer,
the raid driver (I use md) does not and can't see the difference between 
a used block of data and an unused block of data. That's why it has to 
resync everything. Am I right ?
 
Thanks guys,
--
Mikael Chambon

Re: RAID SYNC

[Avijit Pathania]

Looks like you do not have DMA enabled. `dmesg |grep -i dma` to see if 
system recognized it and `hdparm -d /dev/hda` to check if it is enabled.
Check if your IDE chipset is configured in the kernel. Or usr 
/etc/sysconfig/harddisks to enable it using hdparm.

It should take around 30mins for it to finish resync.

HTH
Avijit

Mikael Chambon wrote:

>Hi Again,
>
>My second question is about RAID sync.
>
>Just for my curiosity, I am testing RAID1 on two empty 110 gig partitions, 
>the system takes about 3h30 to resync, why is it taking so long ?
>
>Here is my idea: As the RAID layer has nothing to do with the FS layer,
>the raid driver (I use md) does not and can't see the difference between 
>a used block of data and an unused block of data. That's why it has to 
>resync everything. Am I right ?
> 
>Thanks guys,
>--
>Mikael Chambon
>
>
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