On Wed, Mar 27, 2013 at 12:11 PM, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote:
> On 3/27/2013 11:01 AM, Roy Sigurd Karlsbakk wrote:
>> From the manual
>>
>> -c, --chunk=
>> Specify chunk size of kibibytes. The default when creating an array is 512KB. To ensure compatibility with ear‐
>> lier versions, the default when Building and array with no persistent metadata is 64KB. This is only meaningful
>> for RAID0, RAID4, RAID5, RAID6, and RAID10.
>>
>> meaning - chunk size isn't relevant to a mirror
>
> The man page should be changed to explicitly state that --chunk does not
> apply to RAID1 or --linear arrays. Far too many people are having
> trouble with this. For those people the current docs are apparently too
> subtle.
>
> --
> Stan
'Subtle' is probably a good work. For me it took a few times reading
the man page after looking at what I have here where it tells me
nothing about chunk size on the RAID1.
Note that another level of understanding (which I don't have) has to
do with getting chunk sizes that work well for my needs. That's a
whole other kettle of fish...
Cheers,
Mark
mark@c2stable ~ $ cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md6 : active raid5 sdc6[1] sdd6[2] sdb6[0]
494833664 blocks super 1.1 level 5, 64k chunk, algorithm 2 [3/3] [UUU]
bitmap: 0/2 pages [0KB], 65536KB chunk
md3 : active raid6 sdd3[2] sdc3[1] sdb3[0] sde3[3] sdf3[5]
157305168 blocks super 1.2 level 6, 16k chunk, algorithm 2 [5/5] [UUUUU]
md7 : active raid6 sdd7[2] sdc7[1] sdb7[0] sde2[3] sdf2[4]
395387904 blocks super 1.2 level 6, 16k chunk, algorithm 2 [5/5] [UUUUU]
md126 : active raid1 sdb5[0] sdd5[2] sdc5[1]
52436032 blocks [3/3] [UUU]
unused devices: <none>
mark@c2stable ~ $
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
