I may be converting a host to ext4 and was curious, is 0.90 still the
only superblock version for mdadm/raid-1 that you can boot from
without having to create an initrd/etc?
Are there any benefits to using a superblock > 0.90 for a raid-1 boot
volume < 2TB?
I recently reinstalled my systems, and I had to use superblock 0.9 to be
able to boot ext4 from raid-1 (kernel 2.6.31 - grub2 1.97-beta4).
I didn't go deep with it as I was quite in hurry, so I'm not sure if it
depends by grub2 or by kernel's md autodetection at boot.
I used superblock 1.1 for the others md devices.
The advantage of superblocks >= 1.0 that I prefere is that they persist
the number of recovered read errors; this allow to monitor (at the
moment manually via /sys/block/mdXX/devYY/errors) across system restarts
the health of devices into the array, useful for raid-5 and 2-disks raid-1.
Regards
--
Cordiali saluti.
Yours faithfully.
Giovanni Tessore
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