Hello, For a test environment with an old server I created a storage bay using CentOS 7.9 and LIO. I have some RAID5 Logical Volume exported using ISCSI LIO to some VMWare servers. The storage server have 32Go memory but no memory are used for the buffer/cache I have more than 30Go free. On the storage server when I start io's (dd) on a logical volume, I see the use of the memory buffer/cache (buffer) increase. On a LIO client (VM on a VMWare server) when I do io's, on the storage server no memory buffer/cache are used. This is not a problem with VMWare I have the same issue with a CentOS iSCSI client. This is like LIO bypass the buffer/cache, on the storage server I “loaded” a Logical Volume in the buffer/cache (dd if=/dev/vg/lv of=/dev/null) and from the LIO client when I read de Logical Volume (dd if=/dev/sdx of=/dev/null) all the read io's come from the disk. PS: I have and OpenMediaVault server with TGT for the iSCSI and Logical Volume exported the buffer/cache (vmstat buff) is used. Best regards. Francis
