[lustre-discuss] OSS read cache disappeared?
Thomas Roth
t.roth at gsi.de
Wed Dec 11 04:09:19 PST 2019
Hi all,
on two 2.10.3-systems (one of them a fresh test installation) the paramters for the OSS read cache "do
not exist":
lxfstest02 ~# lctl get_param obdfilter.*.read_cache_enable
error: get_param: param_path 'obdfilter/*/read_cache_enable': No such file or directory
Indeed, only dead links in obdfilter.* :
lxfstest02 ~# ls -l /proc/fs/lustre/obdfilter/test-OST0009
lrwxrwxrwx 1 root root 48 Dec 11 13:01 read_cache_enable ->
../../osd-zfs/hebetest-OST0009/read_cache_enable
lrwxrwxrwx 1 root root 53 Dec 11 13:01 readcache_max_filesize ->
../../osd-zfs/hebetest-OST0009/readcache_max_filesize
lrwxrwxrwx 1 root root 56 Dec 11 13:01 writethrough_cache_enable ->
../../osd-zfs/hebetest-OST0009/writethrough_cache_enable
lxfstest02 ~# ls -l /proc/fs/lustre/osd-zfs/test-OST0009/read_cache_enable
ls: cannot access /proc/fs/lustre/osd-zfs/test-OST0009/read_cache_enable: No such file or directory
I was always content with the manual stating
> By default, read cache is enabled (read_cache_enable=1).
and therefore never checked.
Should I read the release-notes more closely? Is this a ZFS - Feature? (Our ldiskfs - MDTs still have
that parameter).
Regards,
Thomas
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Thomas Roth
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