mam doma server ktory ma 2 hotswap sufliky na disky, pred nasadenim do produkcie som chcel otestovat ako si s tym poradi linux
radic tam je nejaky nforce, driver sata_nv
podla stranky http://linux-ata.org/driver-status.html sata_nv podporuje hotswap, ale nie je vsetko zlato co sa blisti
pri vybrati disku kernel zabeeka hlasky, vyresetuje par krat radic a disk odpoji ale po vlozeni disku spet ho nepripoji
na nete je nejaky patch do kernelu ale kto sa s tym bude srat ?

existuje moznost ako povedat driveru ze disk chceme odpojit a po vlozeni mu znovu povieme nech ho nahodi
povedzme ze mame 2 disky v raid1, sda a sdb, sdb chceme odpojit lebo je zly

debian:~# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda2[0] sdb2[1]
4586432 blocks [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[1]
156248064 blocks [2/2] [UU]

unused devices: <none>

md1 je swap a md0 je root particia

najskor musime failnut jednotlive particie na sdb a odpojit ich z raidu (pokial odide disk, tak sa failnu automaticky)
debian:~# mdadm -f /dev/md0 /dev/sdb1
mdadm: set /dev/sdb1 faulty in /dev/md0
debian:~# mdadm -f /dev/md1 /dev/sdb2
mdadm: set /dev/sdb2 faulty in /dev/md1
debian:~# mdadm -r /dev/md0 /dev/sdb1
mdadm: hot removed /dev/sdb1
debian:~# mdadm -r /dev/md1 /dev/sdb2
mdadm: hot removed /dev/sdb2

teraz povieme driveru ze disk ide prec
najskor sa pozrieme na nejake identifikacne cisielka
debian:~# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: Hitachi HDS72161 Rev: P22O
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: Hitachi HDS72161 Rev: P22O
Type: Direct-Access ANSI SCSI revision: 05


podciarknute cisielka teraz napiseme do tohto prikazu za remove-single-device
debian:~# echo "scsi remove-single-device 1 0 0 0" > /proc/scsi/scsi

kernel zahlasi:
Synchronizing SCSI cache for disk sdb:
ata2.00: disabled

disk mozeme odpojit, vymenit, vlozit a znovu ho nahodime

debian:~# echo "scsi add-single-device 1 0 0 0" > /proc/scsi/scsi

kernel zahlasi:
ata2: exception Emask 0x10 SAct 0x0 SErr 0x19d0000 action 0x3
ata2: hard resetting port
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2.00: ATA-7: Hitachi HDS721616PLA380, P22OAB3A, max UDMA/133
ata2.00: 321672960 sectors, multi 0: LBA48 NCQ (depth 0/32)
ata2.00: configured for UDMA/133
ata2: EH complete
scsi 1:0:0:0: Direct-Access ATA Hitachi HDS72161 P22O PQ: 0 ANSI: 5
SCSI device sdb: 321672960 512-byte hdwr sectors (164697 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: write cache: enabled, read cache: enabled, doesn't support DPO or FUA
SCSI device sdb: 321672960 512-byte hdwr sectors (164697 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sdb: sdb1 sdb2
sd 1:0:0:0: Attached scsi disk sdb


nasledne mozme povytvarat particie napr. cez cfdisk a znovu ho pripojit do raidu cez mdadm

tento postup by mohol fungovat na vsetkych radicoch resp. drivroch ktore podporuju hotswap, ale treba mat hotswap sufliky