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Date: Wed, 25 Jun 2014 17:31:15 +0800 From: Chin Tzung Cheng <chintzung@...il.com> To: linux-ext4@...r.kernel.org Subject: About changing the UUID of external journal device Hi, I have problem while I create a ext4 volume with external journal device. The UUID of external journal device is not the one I specify. First, I create a journal device(/dev/sda4). [root@...alhost sbin]# ./mke2fs -O journal_dev /dev/sda4 [root@...alhost sbin]# ./blkid /dev/sda4 /dev/sda4: UUID="1313c286-7803-4a40-9010-74964554d13f" TYPE="jbd" I use tune2fs to change the UUID of journal device. blkid shows the UUID is changed. [root@...alhost sbin]# ./tune2fs /dev/sda4 -U aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa [root@...alhost sbin]# ./blkid /dev/sda4 /dev/sda4: UUID="aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa" TYPE="jbd" Make an ext4 volume with external journal device (dev/sda4) [root@...alhost sbin]# ./mke2fs /dev/sda3 -t ext4 -J device=/dev/sda4 [root@...alhost sbin]# ./dumpe2fs -h /dev/sda3 | grep UUID dumpe2fs 1.42.10 (18-May-2014) Filesystem UUID: d8f038e5-9539-4b1d-8ccb-63cc56771fc5 Journal UUID: 1313c286-7803-4a40-9010-74964554d13f However, the journal device UUID of ext4 volume is still the old one. It's not the new one. Test environment Kernel version: 3.12.10 e2fsprogs version: 1.42.10 Any help would be appreciated. Thanks, chintzung -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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