Merge branch '20318-disk-cache'

closes #20318

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@curii.com>

diff --cc doc/admin/upgrading.html.textile.liquid
index 6d37009e91d8a50f61cef5fa2267c20f73b348c2,7b8c20fdf9eaba632b0554dea7be38f5f30f560b..c80209822508e10c5dfd0d0c06b44e8c4e3dc12c
--- 1/doc/admin/upgrading.html.textile.liquid
--- 2/doc/admin/upgrading.html.textile.liquid
+++ b/doc/admin/upgrading.html.textile.liquid
@@@ -32,10 -32,12 +32,16 @@@ h2(#main). development mai
  
  "previous: Upgrading to 2.7.1":#v2_7_1
  
+ h3. WebDAV service uses @/var/cache@ for file content
+ 
+ @keep-web@ now stores copies of recently accessed data blocks in @/var/cache/arvados/keep@ instead of in memory. That directory will be created automatically. The default cache size is 10% of the filesystem size. Use the new @Collections.WebDAVCache.DiskCacheSize@ config to specify a different percentage or an absolute size.
+ 
+ If the previously supported @MaxBlockEntries@ config is present, remove it to avoid warning messages at startup.
+ 
 +h3. Check MaxGatewayTunnels config
 +
 +If you use the LSF or Slurm dispatcher, ensure the new @API.MaxGatewayTunnels@ config entry is high enough to support the size of your cluster. See "LSF docs":{{site.baseurl}}/install/crunch2-lsf/install-dispatch.html#MaxGatewayTunnels or "Slurm docs":{{site.baseurl}}/install/crunch2-slurm/install-dispatch.html#MaxGatewayTunnels for details.
 +
  h2(#2_7_1). v2.7.1 (2023-12-12)
  
  "previous: Upgrading to 2.7.0":#v2_7_0

diff --cc lib/config/config.default.yml
Simple merge

diff --cc sdk/go/arvados/config.go
Simple merge