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DescriptionJonathan Earl Brassow
2014-03-28 17:12:24 UTC
LVM in RHEL 7.0 has transitioned to using "raid1" as the default segment type for mirroring. The old "mirror" segment type will still be supported, but is being deemphasized. The LVM manual should reflect this change. My first glance indicates that this effort will only affect small portions of the manual. It could be as simple as adding statements referring users to the "raid1" segment type in the "mirror" sections, but keeping the old mirror sections available.
Comment 2Jonathan Earl Brassow
2014-05-05 21:09:34 UTC
Most things seem ok, but some structure needs changing. Here are some ideas:
Section 2.3.[34]:
Mirror section is descriptive, while RAID section is merely a pointer. This should be reversed. IOW, section 2.3.3 should mention that 'mirror' is deprecated in all but the cluster mirror case and the RAID1 segment type is now the default. The rest of section 2.3.3 could be scrapped. Section 2.3.4 could be more explanitory
Section 4.4.3:
The note at the top should mention that RAID1 is the default segment type for creating mirrors, unless the '--type mirror' argument is used.
The language in the 'Mirrored LVM Logical Volumes in a Cluster' note could be cleaned up... "in a cluster the cluster and cluster mirror infrastructure must be running, the cluster must be quorate" - too many 'cluster's makes it confusing, I think.
The first create example (and every one after that) should have the '--type mirror' argument. If this is not present in RHEL7, it will default to RAID1.
4.4.15:
The '--type raid1' and '--type raid10' arguments are optional now, since they are now the default. I don't think you need to change anything here if you don't want.
Section 5.5:
Don't forget to add '--type mirror' to any command that creates a cluster mirror because it uses the 'mirror' segment type.
Most of the information still seems accurate; but by nature of the structure of the manual, we seem to elevate 'mirror' to the same level as 'RAID' - i.e. another subtopic of LVM to become familiar with. The truth is that the user really doesn't need to be familiar with 'mirror' unless they are using active/active clusters; and we don't really want them using mirrors at all in the single-machine case.
Also - though it is not a big deal - it does seem that the template used for linear, stripe, and mirror is not followed entirely by RAID. Perhaps this is out of necessity. (I do like the way RAID info is collected in one place in section 4.4.15.)