Messages in this thread | | | Date | Tue, 25 Jul 2017 12:10:54 -0400 | From | Theodore Ts'o <> | Subject | Re: bcache with existing ext4 filesystem |
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On Tue, Jul 25, 2017 at 01:12:10PM +0200, Pavel Machek wrote: > > Well... if I move the partition, grub2 (etc) will be unable to access > data on it. (Plus I do not have free space before some of the > partitions I'd like to be cached).
Both Grub and Linux's implementation of ext4 expect the superblock to be at offset 1024 bytes from the beginning of the block device.
From looking at Documentation/bcache.txt, the problem is that bcache works much like LVM or device mapper. That is, you have to create the file system on /dev/bcacheN. That simplies that grub needs to understand bcache, which as far as I understand, it doesn't today.
- Ted
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