On 11/14/2016 05:34 PM, Zdenek Kabelac wrote:
Dne 14.11.2016 v 16:02 Alexander Pashaliyski napsal(a):
Hi guys,
I am in a process of evaluating dm-cache for our backup system.
Currently I have an issue when restart the backup server. The server is
booting for hours, because of IO load. It seems is triggered a flush
from SSD
disk (that is used for a cache device) to the raid controllers (they
are with
slow SATA disks).
I have 10 cached logical volumes in *writethrough mode*, each with 2T
of data
over 2 raid controllers. I use a single SSD disk for the cache.
The backup system is with lvm2-2.02.164-1 & kernel 4.4.30.
Do you have any ideas why such flush is triggered? In writethrough
cache mode
we shouldn't have dirty blocks in the cache.
Hi
Have you ensured there was proper shutdown ?
Cache needs to be properly deactivated - if it's just turned off,
all metadata are marked dirty.
Regards
Zdenek
Hi Zdenek,
Thank you for your answer.
Yes, I am sure. I have modified the lvm2 init script to de-activate all
logical volumes and then volume groups, but the issue still persist.
Regards,
Alex
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
