Здравствуйте.
Давно сделал для одной конторы ISCSI систему на основе targetcli. Делал по этому мануалу: http://etherboot.org/wiki/appnotes/cow
Заранее извиняюсь, в терминах могу путаться.
Система такая. Есть основной образ диска с установленными программами, они почти не меняются. Меняются кофиги, временные файлы, всякий мусор не критичный. Клиенты (Win), по ISCSI, подключают этот образ как диск и работают с этими прогами. Каждый раз, при начале рабочего дня, этот образ у клиента сбрасывается до оригинального. Всё работает без ошибок, все хорошо.
Но возникла проблема. Иногда клиентам не хватает места для кеша этого ISCSI диска. Клиенты забивают диск, выделенный для кеша клиентов, и targetcli зависает. Помогает ребут сервера и пересоздание лунов.
Возникла идей: у каждого клиента физически есть како-то диск. Можно ли клиентский кеш перенести на комп клиента?
Конфиг targetcli:
sysadmin@fserver:~$ sudo targetcli ls
o- / ......................................................................................................................... [...]
o- backstores .............................................................................................................. [...]
| o- block ................................................................................................ [Storage Objects: 101]
| | o- client1 ........................................................ [/dev/mapper/lun0.img.cow.1 (2.7TiB) write-thru activated]
| | o- client100 .................................................... [/dev/mapper/lun0.img.cow.100 (2.7TiB) write-thru activated]
| | o- client101 .................................................... [/dev/mapper/lun0.img.cow.101 (2.7TiB) write-thru activated]
| o- fileio ................................................................................................. [Storage Objects: 1]
| | o- storage1 ............................................................... [/storage1/lun0.img (2.7TiB) write-back activated]
| o- pscsi .................................................................................................. [Storage Objects: 0]
| o- ramdisk ................................................................................................ [Storage Objects: 0]
o- iscsi .......................................................................................................... [Targets: 102]
| o- iqn.2019-02.pro.office24:1 ........................................................................................... [TPGs: 1]
| | o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
| | o- acls .......................................................................................................... [ACLs: 1]
| | | o- iqn.1991-05.com.microsoft:cl01 ...................................................................... [Mapped LUNs: 1]
| | | o- mapped_lun0 ............................................................................... [lun0 block/client1 (rw)]
| | o- luns .......................................................................................................... [LUNs: 1]
| | | o- lun0 ..................................................................... [block/client1 (/dev/mapper/lun0.img.cow.1)]
| | o- portals .................................................................................................... [Portals: 1]
| | o- 0.0.0.0:3260 ..................................................................................................... [OK]
| o- iqn.2019-02.pro.office24:100 ......................................................................................... [TPGs: 1]
| | o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
| | o- acls .......................................................................................................... [ACLs: 1]
| | | o- iqn.1991-05.com.microsoft:cl100 ..................................................................... [Mapped LUNs: 1]
| | | o- mapped_lun0 ............................................................................. [lun0 block/client100 (rw)]
| | o- luns .......................................................................................................... [LUNs: 1]
| | | o- lun0 ................................................................. [block/client100 (/dev/mapper/lun0.img.cow.100)]
| | o- portals .................................................................................................... [Portals: 1]
| | o- 0.0.0.0:3260 ..................................................................................................... [OK]
| o- iqn.2019-02.pro.office24:101 ......................................................................................... [TPGs: 1]
| | o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
| | o- acls .......................................................................................................... [ACLs: 1]
| | | o- iqn.1991-05.com.microsoft:work3 ...................................................................... [Mapped LUNs: 1]
| | | o- mapped_lun0 ............................................................................. [lun0 block/client101 (rw)]
| | o- luns .......................................................................................................... [LUNs: 1]
| | | o- lun0 ................................................................. [block/client101 (/dev/mapper/lun0.img.cow.101)]
| | o- portals .................................................................................................... [Portals: 1]
| | o- 0.0.0.0:3260 ..................................................................................................... [OK]
| o- iqn.2019-02.pro.office24:gserver ..................................................................................... [TPGs: 1]
| o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
| o- acls .......................................................................................................... [ACLs: 1]
| | o- iqn.1991-05.com.microsoft:gserver .................................................................... [Mapped LUNs: 1]
| | o- mapped_lun0 ............................................................................. [lun0 fileio/storage1 (rw)]
| o- luns .......................................................................................................... [LUNs: 1]
| | o- lun0 ........................................................................... [fileio/storage1 (/storage1/lun0.img)]
| o- portals .................................................................................................... [Portals: 1]
| o- 0.0.0.0:3260 ..................................................................................................... [OK]
o- loopback ......................................................................................................... [Targets: 0]
o- vhost ............................................................................................................ [Targets: 0]
