Re: [PATCH docs 2/2] pvesm: update features for LVM,iSCSI,FC,SAS

[Aaron Lauterer <a.lauterer@proxmox.com>]

On  2026-07-02  13:37, Maximiliano Sandoval wrote:
> Aaron Lauterer <a.lauterer@proxmox.com> writes:
> 
>> And reword the footnotes to mention the multipath guide that show to set
>> it up with LVM on top in detail.
>>
>> Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
>> ---
>>   pvesm.adoc | 17 +++++++++--------
>>   1 file changed, 9 insertions(+), 8 deletions(-)
>>
>> diff --git a/pvesm.adoc b/pvesm.adoc
>> index b43ca42..5bd24b2 100644
>> --- a/pvesm.adoc
>> +++ b/pvesm.adoc
>> @@ -77,9 +77,9 @@ nodes that can be accessed as RBD (RADOS Block Device).
>>   |CephFS         |cephfs      |file   |yes   |yes      |yes
>>   |LVM            |lvm         |block  |no^3^ |yes^4^   |yes
>>   |LVM-thin       |lvmthin     |block  |no    |yes      |yes
>> -|iSCSI/kernel   |iscsi       |block  |yes   |no       |yes
>> -|iSCSI/libiscsi |iscsidirect |block  |yes   |no       |yes
>> -|FC/SAS         |native^6^   |block  |yes   |yes^4^   |yes
>> +|iSCSI/kernel   |iscsi       |block  |yes^3^|yes^4^   |yes
>> +|iSCSI/libiscsi |iscsidirect |block  |yes^3^|yes^4^   |yes
> 
> Technically, neither iSCSI storage plugin supports snapshots, what
> supports snapshots is a LVM storage on top of a iSCSI block device. I
> would personally keep the `no` and add a footnote saying that it is
> possible to have snapshots on a LVM storage with savc on top of the
> iSCSI storage.

Which is why I framed the footnotes to emphasize that multipathing + LVM 
is needed.
And realistically, that combination is the only way the vast majority of 
our users are using shared block storage.  I see it as a "full package" 
that needs to be configured before you can actually use the whole stack 
as shared storage. FC/SAS/iSCSI alone without LVM is rather useless, 
except for maybe very esoteric use cases.
We would rather not give the wrong impression that it is not possible 
for someone who very briefly takes a glimpse at the table.