# Config. ISCSI com multipath no Debian 10 ## 1. Introdução iSCSI é um dos padrões para armazenamento de dados em rede. Utilizado para conexão entre dispositivos como storages, servidores, computadores e outras estações de trabalho. Neste protocolo, os comandos SCSI são transportados sobre a rede IP. Multipath usa componentes redundantes - adaptadores, cabos e comutadores - para criar caminhos lógicos entre o servidor e o dispositivo de armazenamento. Se houver uma falha de componente, fazendo com que um caminho lógico falha, a lógica de vários caminhos usará um caminho alternativo de E/S para que os aplicativos ainda possam acessar seus dados. Eventualmente pode melhorar o desempenho ao rebalancear novamente a carga em todos esses caminhos ## 2. Ferramentas utilizadas Os softwares utilizados na produção deste tutorial é apresentado a seguir:
- Debian 10, 64 bits - open-iscsi 2.0.874-7.1 - multipath-tools 0.7.9
## 3. Configurando o serviço Todos os comandos executados nesse tutorial foram executados com o usuário **root**. 3.1. Instalação dos pacotes ```shell apt install multipath-tools multipath-tools-boot ``` 3.2. Descobrir os targets ```shell iscsiadm -m discovery -t sendtargets -p 192.168.50.2 # O IP indicado aqui é de uma das interfaces do storage ```
192.168.50.2:3260,1 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e 192.168.50.3:3260,2 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e 192.168.51.2:3260,3 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e 192.168.51.3:3260,4 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e
3.3. Realizar a conexão ao target ```shell iscsiadm -m node --login ```
Logging in to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.50.2,3260\] (multiple) Logging in to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.51.3,3260\] (multiple) Logging in to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.51.2,3260\] (multiple) Logging in to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.50.3,3260\] (multiple) Login to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.50.2,3260\] successful. Login to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.51.3,3260\] successful. Login to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.51.2,3260\] successful. Login to \[iface: default, target: iqn.2017-10.com.hpe:storage.msa2052.15088aa10e, portal: 192.168.50.3,3260\] successful.
3.4. Listar as sessões ativas ```shell iscsiadm -m session -o show ```
tcp: \[1\] 192.168.50.2:3260,1 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e (non-flash) tcp: \[2\] 192.168.51.3:3260,4 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e (non-flash) tcp: \[3\] 192.168.51.2:3260,3 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e (non-flash) tcp: \[4\] 192.168.50.3:3260,2 iqn.2017-10.com.hpe:storage.msa2052.15088aa10e (non-flash)
3.5. Exibe informações dos dispositivos ```shell multipath -v3 ```
... ... Saída omitida ... ===== paths list ===== uuid hcil dev dev\_t pri dm\_st chk\_st vend/prod 360080e50002c8d920000146c5d1bca10 2:0:0:0 sdc 8:32 50 undef undef HPE,MSA 1 360080e50002c8d920000146c5d1bca10 3:0:0:0 sda 8:0 10 undef undef HPE,MSA 1 360080e50002c8d920000146c5d1bca10 4:0:0:0 sdb 8:16 50 undef undef HPE,MSA 1 360080e50002c8d920000146c5d1bca10 5:0:0:0 sdd 8:48 10 undef undef HPE,MSA 1 Dec 13 16:23:15 | libdevmapper version 1.02.155 (2018-12-18) Dec 13 16:23:15 | DM multipath kernel driver v1.13.0 Dec 13 16:23:15 | sdc: udev property ID\_WWN whitelisted Dec 13 16:23:15 | wwid 360080e50002c8d920000146c5d1bca10 not in wwids file, skipping sdc Dec 13 16:23:15 | sdc: orphan path, only one path Dec 13 16:23:15 | sysfs prioritizer refcount 4 Dec 13 16:23:15 | sda: udev property ID\_WWN whitelisted Dec 13 16:23:15 | wwid 360080e50002c8d920000146c5d1bca10 not in wwids file, skipping sda Dec 13 16:23:15 | sda: orphan path, only one path Dec 13 16:23:15 | sysfs prioritizer refcount 3 Dec 13 16:23:15 | sdb: udev property ID\_WWN whitelisted Dec 13 16:23:15 | wwid 360080e50002c8d920000146c5d1bca10 not in wwids file, skipping sdb Dec 13 16:23:15 | sdb: orphan path, only one path Dec 13 16:23:15 | sysfs prioritizer refcount 2 Dec 13 16:23:15 | sdd: udev property ID\_WWN whitelisted Dec 13 16:23:15 | wwid 360080e50002c8d920000146c5d1bca10 not in wwids file, skipping sdd Dec 13 16:23:15 | sdd: orphan path, only one path Dec 13 16:23:15 | sysfs prioritizer refcount 1 Dec 13 16:23:15 | unloading sysfs prioritizer Dec 13 16:23:15 | unloading const prioritizer Dec 13 16:23:15 | unloading tur checker
3.6. Adicionar o WWID do disco compartilhado via iSCSI para a configuração ```shell multipath -a 360080e50002c8d920000146c5d1bca10 ```
wwid '360080e50002c8d920000146c5d1bca10' added
3.7. Associar o WWID a um nome, para facilitar o gerenciamento ```shell nano /etc/multipath.conf # Abrir o arquivo ```
/etc/multipath.conf
\# Adicionar este trecho ao final do arquivo multipaths { multipath { wwid 360080e50002c8d920000146c5d1bca10 alias meusdados } }
3.8. Reiniciar o serviço para aplicar as alterações ```shell systemctl restart multipathd ``` 3.9. Verificar se o dispositivo multipath foi criado ```shell multipath -l ```
meusdados (360080e50002c8d920000146c5d1bca10) dm-0 HPE,MSA 2052 SAN size=128G features='3 queue\_if\_no\_path queue\_mode mq' hwhandler='1 alua' wp=rw |-+- policy='service-time 0' prio=0 status=active | |- 3:0:0:0 sdg 8:32 active undef running | `- 6:0:0:0 sdf 8:16 active undef running `-+- policy='service-time 0' prio=0 status=enabled |- 4:0:0:0 sde 8:0 active undef running `- 7:0:0:0 sdh 8:48 active undef running
3.10. Configurar a conexão aos dispositivos via iSCSI no boot ```shell sed 's/node.startup = manual/node.startup = automatic/' -i /etc/iscsi/iscsid.conf sed 's/node.startup = manual/node.startup = automatic/' -i /etc/iscsi/nodes/*/*/default sed 's/node.conn\[0\].startup = manual/node.conn\[0\].startup = automatic/' -i /etc/iscsi/nodes/*/*/default ``` Referências [https://openwares.net/2019/07/03/debian-buster-multipath-configuration/](https://openwares.net/2019/07/03/debian-buster-multipath-configuration/) [https://docs.microsoft.com/pt-br/azure/storsimple/storsimple-8000-configure-mpio-windows-server](https://docs.microsoft.com/pt-br/azure/storsimple/storsimple-8000-configure-mpio-windows-server)