On 2017-08-31 07:36, Roman Mamedov wrote:
On Thu, 31 Aug 2017 12:43:19 +0200
Marco Lorenzo Crociani <mar...@prismatelecomtesting.com> wrote:
Hi,
this 37T filesystem took some times to mount. It has 47
subvolumes/snapshots and is mounted with
noatime,compress=zlib,space_cache. Is it normal, due to its size?
If you could implement SSD caching in front of your FS (such as lvmcache or
bcache), that would work wonders for performance in general, and especially
for mount times. I have seen amazing results with lvmcache (of just 32 GB) for
a 14 TB FS.
If you use dm-cache (what LVM uses), you need to be _VERY_ careful and
can't use it safely at all with multi-device volumes because it leaves
the underlying block device exposed.
As for in general, with your FS size perhaps you should be using
"space_cache=v2" for better performance, but I'm not sure if that will have
any effect on mount time (aside from slowing down the first mount with that).
It shouldn't have any other impact on mount time, but it may speed up
other operations.
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