<div dir="auto"><div>This used to happen if the chunksize increased as a result of needing to use more than a million chunks to store the size of the cached lv. What is the size of the pool?</div><div dir="auto"> </div><div dir="auto">Regards,</div><div dir="auto">Nikhil.</div><div dir="auto"> <div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Tue, 30 Jul, 2019, 1:25 PM Lakshmi Narasimhan Sundararajan, <<a href="mailto:lns@portworx.com">lns@portworx.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="#954F72"><div class="m_3432648488878616578WordSection1">Hi Team,A very good day to all. I am using lvmcache in writeback mode. When there are dirty blocks still in the lv, and if needs to be destroyed or flushed, thenIt seems to me that there are some conditions under which the dirty data flush gets stuck forever. As an example:root@pdc4-sm35:~# lvremove -f pwx0/pool 367 blocks must still be flushed. 367 blocks must still be flushed. 367 blocks must still be flushed. 367 blocks must still be flushed. 367 blocks must still be flushed. 367 blocks must still be flushed.^Croot@pdc4-sm35:~# I am running these version:root@pdc4-sm35:~# lvm version LVM version: 2.02.133(2) (2015-10-30) Library version: 1.02.110 (2015-10-30) Driver version: 4.34.0root@pdc4-sm35:~# This issue seems old and reported multiple places. There have been some acknowledgement that this issue is resolved in 2.02.133, but still I see it. Also, I have seen some posts report it in 2.02.170+ as well (here: <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878441" target="_blank" rel="noreferrer">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878441</a>) (Package: lvm2 Version: 2.02.173-1 Severity: normal) I filed one here myself, <a href="https://github.com/lvmteam/lvm2/issues/22" target="_blank" rel="noreferrer">https://github.com/lvmteam/lvm2/issues/22</a>, trying to understand from you experts where we are on this? I would sincerely appreciate your help in understanding the state of this issue in more detail. Best regards LNSent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986" target="_blank" rel="noreferrer">Mail</a> for Windows 10 </div></div>-- lvm-devel mailing list <a href="mailto:lvm-devel@redhat.com" target="_blank" rel="noreferrer">lvm-devel@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/lvm-devel" rel="noreferrer noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/lvm-devel</a></blockquote></div></div></div>