From: Ilia Zykov <linux@izyk.ru>
To: linux-lvm@redhat.com
Subject: [linux-lvm] Why doesn't the lvmcache support the discard (trim) command?
Date: Fri, 19 Oct 2018 01:56:04 +0300 [thread overview]
Message-ID: <de207689-775b-5c36-1443-e035f19ff65f@izyk.ru> (raw)
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Maybe it will be implemented later? But it seems to me a little strange when there is no way to clear the cache from a garbage.
Maybe I do not understand? Can you please explain this behavior.
For example:
I have the full cached partition, with full cache:
[root@localhost ~]# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/test-data 12G 12G 0 100% /data
[root@localhost ~]# lvs -a
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
data test Cwi-aoC--- 12.00g [fast] [data_corig] 99.72 2.93 0.00
[data_corig] test owi-aoC--- 12.00g
[fast] test Cwi---C--- 1.00g 99.72 2.93 0.00
[fast_cdata] test Cwi-ao---- 1.00g
[fast_cmeta] test ewi-ao---- 8.00m
[lvol0_pmspare] test ewi------- 8.00m
I clear the partition and do fstrim:
[root@localhost ~]# rm -rf /data/*
[root@localhost ~]# fstrim -v /data
[root@localhost ~]# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/test-data 12G 41M 12G 1% /data
But the cache remained full:
[root@localhost ~]# lvs -a
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
data test Cwi-aoC--- 12.00g [fast] [data_corig] 99.72 2.93 0.00
[data_corig] test owi-aoC--- 12.00g
[fast] test Cwi---C--- 1.00g 99.72 2.93 0.00
[fast_cdata] test Cwi-ao---- 1.00g
[fast_cmeta] test ewi-ao---- 8.00m
[lvol0_pmspare] test ewi------- 8.00m
Thank you.
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next reply other threads:[~2018-10-18 22:56 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-18 22:56 Ilia Zykov [this message]
2018-10-19 9:12 ` [linux-lvm] Why doesn't the lvmcache support the discard (trim) command? Zdenek Kabelac
2018-10-19 9:42 ` Gionatan Danti
2018-10-19 9:49 ` Zdenek Kabelac
2018-10-19 9:55 ` Ilia Zykov
2018-10-19 10:58 ` Zdenek Kabelac
2018-10-19 12:45 ` Gionatan Danti
2018-10-19 13:08 ` Zdenek Kabelac
2018-10-19 13:16 ` Ilia Zykov
2018-10-19 17:00 ` Ilia Zykov
2018-10-22 10:54 ` Zdenek Kabelac
2018-10-19 20:54 ` Gionatan Danti
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