On 12/28/2016 04:24 PM, Rick Stevens wrote:
On 12/28/2016 10:33 AM, Raman Gupta wrote:
> I would like to change the cache mode of an existing lvm cache volume.
>
> I see the following in the man page:
>
> `With the --cachemode option, the cache mode can be set when creating
> a cache LV, or changed on an existing cache LV.`
>
> However, it does not seem to work:
>
> # lvs -o cache_mode vg_raid10/lv_var
> CacheMode
> writethrough
> # lvconvert --cachemode writeback vg_raid10/lv_var
> # lvs -o cache_mode vg_raid10/lv_var
> CacheMode
> writethrough
>
> (Fedora 23, 4.8.14)
>
> The `lvconvert` command produces no output, and there is nothing in
> dmesg or the journal.
Have you tried adding the "-v" or "--verbose" flags to see if there
is an issue?
No change:
# lvconvert --verbose --cachemode writeback vg_raid10/lv_var
# lvs -o cache_mode vg_raid10/lv_var
CacheMode
writethrough
Regards,
Raman