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From: Gang He <>
Subject: [linux-lvm] About --mirrorlog mirrored option in the latest lvm2
Date: Wed, 31 Oct 2018 16:28:51 +0800	[thread overview]
Message-ID: <> (raw)

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Hello List,

As you know, in the past versions(e.g. v2.02.120), lvcreate supports
creating a mirror type LV with "--mirrorlog mirrored" option,
But in the latest versions(e.g. v2.02.180), lvm2 says "mirrored is a
persistent log that is itself mirrored, but should be avoided. Instead, use
the raid1 type for log redundancy."
Then,  my questions are as below,
1)The latest lvm2 does not allow creating this kind of LV, or just not
In my test environment, it looks that LVM2 can not create this kind of LV.
tb0307-nd1:/ # lvcreate --type mirror -m1 --mirrorlog mirrored -L 2G -n
mirr-lv cluster-vg2
  Log type, "mirrored", is unavailable to cluster mirrors.
If I try to create this kind of LV in local VG (not cluster VG), this
operation will be supported?

2)If we can not create this kind of LV, how can we migrate these existing
LVs after we upgrade LVM2 to the latest version (e.g. v2.02.180)?
e.g. we need to convert this kind of LV to "RAID1 type LV, I want to know
if there is a suggested guide for this scenario.


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             reply	other threads:[~2018-10-31  8:29 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-31  8:28 Gang He [this message]
  -- strict thread matches above, loose matches on Subject: below --
2018-10-31  7:18 [linux-lvm] About --mirrorlog mirrored option in the latest lvm2 Gang He
2018-10-31 10:08 ` Zdenek Kabelac

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