Re: how to which to bigger disk (md can do it?)

[Farkas Levente <lfarkas@bnap.hu>]

Hendrik Visage wrote:
> On Sun, Nov 16, 2003 at 12:03:46PM +0100, Farkas Levente wrote:
> 
>>hi,
>>we've got a server with 3ware 7500-8 and 8 pieces of 120 GB maxtor hd 
>>and software raid-5. the 1TB disk is running out of the space so we 
> 
> 
> Are you sure about the Software RAID on this 3ware adapater?? I was
> under the impression it's a HW Raid adapter?
> (I have a preference to HW RAID if available...)

we've got a kernel creash with hardware raid 5 what's more software raid 
5 seems to be faster.

>>- put the 8 disk to another server and run rsync through two gigabit 
>>ethernet card. but it can takes more than a day to sync about 800GB.
> 
> 
> You could do this initially during the week before the swapout, and then
> just update it  before the swap out. Something te note, if it's lots of files,
> I'd advise to run multiple rsyncs over smaller directories, as it speeds
> up the rsync processing alot.

can't help since this is the backup server and almost everything 
changing on it.

>>- switch the disks one-by-one in the current server and leave linux's 
>>software raid to sync the data. in this case we only have to stop the 
>>system a few mintues per day and takes 8 days, but continous operation. 
>>does it possible? after I put all new hard disk the totel capacity will 
>>be (8-1)*200 GB or it will remain (8-1)*120 GB? since during the disk 
>>switch the total space is the smallest hd's*(n-1), but what happens when 
>>I put the last 200GB disk?
> 
> 
> If it's SW raid, it'll be based on the partitions, so you'll have to create the
> partitions bigger than the current 120GB partitions. Then after the last disk,
> the size would be the bigger size, however you'll then need to run a growfs
> (or similar) for your filesystem to expand it to the bigger size.

which partitions? it's not clear to me. we've got :
- 8 pieces of 120 GB Linux raid autodetect (/dev/sda1, /dev/sdb1 etc)
- 1 pieces of 840 GB ext3 (/dev/md2)
so which partition should I have to create and grow?
but what I'd like to prefere the cloning. is there any way to 'rsync' 
between a 120 GB and 200 GB disk which is Linux raid autodetect (and not 
eg. ext2)?

another good question anybody use 200 GB maxtor hd with 3ware 7500-8 
controller?

thanks.

-- 
   Levente                               "Si vis pacem para bellum!"