RE: Please review: Slackware RAID How-To

[Ninti Systems <office@ninti.com.au>]

But is the stride parameter required at all if I'm only building a RAID1
array with two disks?

Also, is the chunk size necessary in this case as I remember getting a
message on boot up to the effect that "Chunk size not necessary here,
but proceeding anyway!".

Thanks

Mick


On Thu, 2004-05-20 at 11:12, John Lange wrote:
> On Sun, 2004-05-16 at 23:51, Guy wrote:
> > md2 has 4 disks with a chunk size of 128K.  Since only 3 disks are used for
> > data, and the filesystem block size is 4K, the stride size should be
> > 128*3/4, or 96.
> > Change:
> > 	mke2fs -b 4096 -R stride=32 /dev/md2
> > To:
> > 	mke2fs -b 4096 -R stride=96 /dev/md2
> > 
> > My logic:
> > 	"Stripe size" is "chunk size" times "number of data disks".
> > 	From example:
> > 		"chunk size" = 128
> > 		"number of data disks" = "nr-raid-disks" - 1 (-2 if RAID6)
> 
> I think this is incorrect. At this point I defer to the
> Software-RAID-HOWTO.
> 
> http://www.tldp.org/HOWTO/Software-RAID-HOWTO-5.html#ss5.10
> 
> >From that document stride is chucksize/blocksize . Number of disks does
> not enter into it.
> 
> So with a chunksize of 128, and a block size of 4 it would be:
> 
> 128K/4K = 32 for stride.
> 
> If this is indeed correct I will be sure to expand that area of the
> How-To so it is more clear.
> 
> Thanks very much for your feedback.
> 
> Regards,
> 
> John Lange
> 
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