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What was the default chunk size in previous versions of mdadm? Is there a way to set data/super offset? Trying to recreate a raid 5 md with all spares

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http://serverfault.com – I have a 6 device raid 5 array which had 1 disk go bad and then due to a power outage, the machine shutdown and when it started all the disks were showing up as spares with the following mdadm -E output. /dev/sda5: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : b480fe0c:c9e29256:0fcf1b0c:1f8c762c Name : GATEWAY:RAID5_500G Creation Time : Wed Apr 28 16:10:43 2010 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 976768002 (465.76 GiB 500.11 GB) Used Dev Size : 976765954 (465.76 GiB 500.10 GB) Data Offset : 2048 sectors Super Offset : 8 sectors (HowTos)