docs(solana-rpc): expand agave and geyser runbook

doc/step-002a-storage-nvme0n1-xfs.txt

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+Step 002A: Storage pod Solana data (nvme0n1 -> XFS -> /var/lib/solana/{ledger,accounts})
+
+Cel:
+- system zostaje na md1 (/)
+- dane Solany (ledger/accounts) ida na osobny NVMe: /dev/nvme0n1
+
+UWAGA: kroki nizej KASUJA dane na /dev/nvme0n1.
+
+0) Check (czy nvme0n1 jest do wyczyszczenia)
+  lsblk /dev/nvme0n1
+  sudo wipefs -n /dev/nvme0n1
+  sudo lsblk -f /dev/nvme0n1
+
+1) Partycje (50/50)
+  sudo apt-get update
+  sudo apt-get install -y parted
+
+  sudo parted -s /dev/nvme0n1 mklabel gpt
+  sudo parted -s /dev/nvme0n1 mkpart primary 0% 50%
+  sudo parted -s /dev/nvme0n1 mkpart primary 50% 100%
+  sudo partprobe /dev/nvme0n1
+  sudo udevadm settle
+
+  lsblk /dev/nvme0n1
+  ls -l /dev/nvme0n1p1 /dev/nvme0n1p2
+
+2) Format XFS
+Uwaga: mkfs.xfs na Ubuntu ma limit label <= 12 znakow.
+
+  sudo mkfs.xfs -f -L sol_ledger /dev/nvme0n1p1
+  sudo mkfs.xfs -f -L sol_accts  /dev/nvme0n1p2
+  sudo blkid /dev/nvme0n1p1 /dev/nvme0n1p2
+
+3) Mountpointy + fstab (po UUID)
+  sudo install -d -o solana -g solana -m 0750 /var/lib/solana/ledger /var/lib/solana/accounts
+
+  UUID_LEDGER="$(sudo blkid -s UUID -o value /dev/nvme0n1p1)"
+  UUID_ACCTS="$(sudo blkid -s UUID -o value /dev/nvme0n1p2)"
+
+  echo "UUID=$UUID_LEDGER /var/lib/solana/ledger   xfs noatime,nodiratime 0 2" | sudo tee -a /etc/fstab >/dev/null
+  echo "UUID=$UUID_ACCTS  /var/lib/solana/accounts xfs noatime,nodiratime 0 2" | sudo tee -a /etc/fstab >/dev/null
+
+  sudo mount -a
+
+  # systemd pokazuje hint po edycji fstab - to jest OK, ale zrob reload:
+  sudo systemctl daemon-reload
+
+4) WAŻNE: ustaw ownera na zamontowanych filesystemach
+Po mount, root filesystemu jest domyslnie root:root 755, wiec validator uruchamiany jako solana nie zapisze ledger/accounts.
+
+  sudo chown solana:solana /var/lib/solana/ledger /var/lib/solana/accounts
+  sudo chmod 750 /var/lib/solana/ledger /var/lib/solana/accounts
+
+5) Weryfikacja
+  df -hT /var/lib/solana/ledger /var/lib/solana/accounts
+  findmnt /var/lib/solana/ledger
+  findmnt /var/lib/solana/accounts
+
+  stat -c '%U:%G %a %n' /var/lib/solana/ledger /var/lib/solana/accounts
+
+Dla tego hosta (z wdrozenia):
+- /dev/nvme0n1p1 (LABEL=sol_ledger) UUID=56a2c342-3162-43f2-9649-e0dd25db870d
+- /dev/nvme0n1p2 (LABEL=sol_accts)  UUID=ae5d6625-0910-489a-bbe3-6fd156439e03
+