It's definitely a bug, because when I tried this with 2.6.22-14-server stock Ubuntu kernel, it worked as expected. Even hotplug events were handled correctly, so I just pulled disk off, and inserted another without exporting it from system. Like this:
# dmesg | tail -16
[ 538.313459] mptsas: ioc0: removing ssp device, channel 0, id 9, phy 0
[ 538.313591] sd 0:0:4:0: [sda] Synchronizing SCSI cache
[ 538.316497] sd 0:0:4:0: [sda] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[ 558.944876] mptsas: ioc0: attaching ssp device, channel 0, id 4, phy 0
[ 558.945896] scsi 0:0:5:0: Direct-Access FUJITSU MBA3147RC 0103 PQ: 0 ANSI: 5
[ 558.947265] sd 0:0:5:0: [sda] 287277984 512-byte hardware sectors (147086 MB)
[ 558.949117] sd 0:0:5:0: [sda] Write Protect is off
[ 558.949119] sd 0:0:5:0: [sda] Mode Sense: bf 00 00 08
[ 558.950360] sd 0:0:5:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 558.951024] sd 0:0:5:0: [sda] 287277984 512-byte hardware sectors (147086 MB)
[ 558.952876] sd 0:0:5:0: [sda] Write Protect is off
[ 558.952878] sd 0:0:5:0: [sda] Mode Sense: bf 00 00 08
[ 558.954126] sd 0:0:5:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 558.954128] sda: sda1
[ 558.964969] sd 0:0:5:0: [sda] Attached SCSI disk
[ 558.964990] sd 0:0:5:0: Attached scsi generic sg0 type 0
# uname -a
Linux soap.bsadm-d 2.6.22-14-server #1 SMP Fri Aug 15 20:08:01 MSD 2008 x86_64 GNU/Linux
Vlad Seliverstov wrote:
Hi.
I'm experiencing some strange problem with hotswap on my linux box with
SAS1064ET SAS controller and 2.6.26-5 kernel. When I'm trying to remove
disk from system, like this:
# systool -b scsi
Bus = "scsi"
Device = "0:0:0:0"
Device = "0:0:1:0"
Device = "0:0:2:0"
Device = "0:0:3:0"
Device = "1:0:0:0"
# echo 1 >
/sys/class/scsi_host/host0/device/port-0\:0/end_device-0\:0/target0\:0\:0/0\:0\:0\:0/delete
# systool -b scsi
Bus = "scsi"
Device = "0:0:1:0"
Device = "0:0:2:0"
Device = "0:0:3:0"
Device = "1:0:0:0"
It's OK. Disk successfully removed. When I'm trying to rescan bus
without physical removal of this disk like this:
# echo "- - -" > /sys/class/scsi_host/host0/scan
It's OK again. Disk successfully attached:
# systool -b scsi
Bus = "scsi"
Device = "0:0:0:0"
Device = "0:0:1:0"
Device = "0:0:2:0"
Device = "0:0:3:0"
Device = "1:0:0:0"
But when I detach disk from system, physically remove it from box, swap
it with another one and try to attach it like:
# echo "- - -" > /sys/class/scsi_host/host0/scan
Nothing happens. Linux doesn't see any new hard drives attached to this
host.
Interesting, that if I will swap disk drives again (inserting an old
one), and rescan bus - It'll be OK again, and disk will be successfully
attached.
Are there any probability of kernel bug?
I tried 2.6.24-19 and 2.6.26-5 kernels from Ubuntu distribution and got
the same on both of them.
Here is some info about my box:
# uname -a
Linux soap 2.6.26-5-server #1 SMP Tue Aug 12 22:15:37 MSD 2008 x86_64
GNU/Linux
# lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation 5000P Chipset Memory
Controller Hub [8086:25d8] (rev b1)
00:02.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI
Express x8 Port 2-3 [8086:25f7] (rev b1)
00:04.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI
Express x8 Port 4-5 [8086:25f8] (rev b1)
00:06.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI
Express x8 Port 6-7 [8086:25f9] (rev b1)
00:08.0 System peripheral [0880]: Intel Corporation 5000 Series Chipset
DMA Engine [8086:1a38] (rev b1)
00:10.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset FSB
Registers [8086:25f0] (rev b1)
00:10.1 Host bridge [0600]: Intel Corporation 5000 Series Chipset FSB
Registers [8086:25f0] (rev b1)
00:10.2 Host bridge [0600]: Intel Corporation 5000 Series Chipset FSB
Registers [8086:25f0] (rev b1)
00:11.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset
Reserved Registers [8086:25f1] (rev b1)
00:13.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset
Reserved Registers [8086:25f3] (rev b1)
00:15.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset FBD
Registers [8086:25f5] (rev b1)
00:16.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset FBD
Registers [8086:25f6] (rev b1)
00:1c.0 PCI bridge [0604]: Intel Corporation 631xESB/632xESB/3100
Chipset PCI Express Root Port 1 [8086:2690] (rev 09)
00:1d.0 USB Controller [0c03]: Intel Corporation 631xESB/632xESB/3100
Chipset UHCI USB Controller #1 [8086:2688] (rev 09)
00:1d.1 USB Controller [0c03]: Intel Corporation 631xESB/632xESB/3100
Chipset UHCI USB Controller #2 [8086:2689] (rev 09)
00:1d.2 USB Controller [0c03]: Intel Corporation 631xESB/632xESB/3100
Chipset UHCI USB Controller #3 [8086:268a] (rev 09)
00:1d.3 USB Controller [0c03]: Intel Corporation 631xESB/632xESB/3100
Chipset UHCI USB Controller #4 [8086:268b] (rev 09)
00:1d.7 USB Controller [0c03]: Intel Corporation 631xESB/632xESB/3100
Chipset EHCI USB2 Controller [8086:268c] (rev 09)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge
[8086:244e] (rev d9)
00:1f.0 ISA bridge [0601]: Intel Corporation 631xESB/632xESB/3100
Chipset LPC Interface Controller [8086:2670] (rev 09)
00:1f.1 IDE interface [0101]: Intel Corporation 631xESB/632xESB IDE
Controller [8086:269e] (rev 09)
00:1f.3 SMBus [0c05]: Intel Corporation 631xESB/632xESB/3100 Chipset
SMBus Controller [8086:269b] (rev 09)
01:00.0 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express
Upstream Port [8086:3500] (rev 01)
01:00.3 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express
to PCI-X Bridge [8086:350c] (rev 01)
02:00.0 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express
Downstream Port E1 [8086:3510] (rev 01)
02:02.0 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express
Downstream Port E3 [8086:3518] (rev 01)
04:00.0 Ethernet controller [0200]: Intel Corporation 80003ES2LAN
Gigabit Ethernet Controller (Copper) [8086:1096] (rev 01)
04:00.1 Ethernet controller [0200]: Intel Corporation 80003ES2LAN
Gigabit Ethernet Controller (Copper) [8086:1096] (rev 01)
06:00.0 SCSI storage controller [0100]: LSI Logic / Symbios Logic
SAS1064ET PCI-Express Fusion-MPT SAS [1000:0056] (rev 08)
08:00.0 PCI bridge [0604]: Intel Corporation 6702PXH PCI Express-to-PCI
Bridge A [8086:032c] (rev 09)
0a:01.0 VGA compatible controller [0300]: ATI Technologies Inc ES1000
[1002:515e] (rev 02)
# lsmod
Module Size Used by
sbs 22544 0 battery 21512 0
sbshc 14592 1 sbs
ac 13576 0 video 29588 0
output 12032 1 video
iptable_filter 11648 0 ip_tables 28816 1
iptable_filter
x_tables 31624 1 ip_tables
ext3 146064 1 jbd 61992 1 ext3
parport_pc 45096 0 lp 19460 0
parport 49456 2 parport_pc,lp
loop 26636 0 snd_pcsp 19708 0
snd_pcm 98184 1 snd_pcsp
snd_timer 33936 1 snd_pcm
snd 76872 3 snd_pcsp,snd_pcm,snd_timer
serio_raw 14596 0 soundcore 16672 1 snd
iTCO_wdt 20688 0 e1000e 133284 0
psmouse 51100 0 snd_page_alloc 17808 1 snd_pcm
iTCO_vendor_support 12932 1 iTCO_wdt
ipv6 308456 44 container 12544 0
button 15904 0 shpchp 41760 0
pci_hotplug 39352 1 shpchp
i5000_edac 18824 0 edac_core 58776 3 i5000_edac
joydev 20864 0 evdev 20480 0
ext2 80400 1 mbcache 17412 2 ext3,ext2
pata_acpi 13440 0 sg 44768 0
sd_mod 36160 8 ata_piix 29316 1
usbhid 40288 0 hid 56000 1 usbhid
ata_generic 14212 0 floppy 73192 0
e1000 143680 0 libata 191968 3
pata_acpi,ata_piix,ata_generic
mptsas 44816 3 dock 18592 1 libata
ehci_hcd 46988 0 uhci_hcd 34208 0
mptscsih 49408 1 mptsas
mptbase 91364 2 mptsas,mptscsih
scsi_transport_sas 45184 1 mptsas
usbcore 172696 4 usbhid,ehci_hcd,uhci_hcd
scsi_mod 179576 6
sg,sd_mod,libata,mptsas,mptscsih,scsi_transport_sas
raid10 30848 1 raid456 138272 0
async_xor 12800 1 raid456
async_memcpy 11008 1 raid456
async_tx 16500 3 raid456,async_xor,async_memcpy
xor 14096 2 raid456,async_xor
raid1 31488 0 raid0 15488 0
multipath 16512 0 linear 13568 0
md_mod 94884 7 raid10,raid456,raid1,raid0,multipath,linear
thermal 27680 0 processor 50496 1 thermal
fan 13576 0 fbcon 51200 0
tileblit 11392 1 fbcon
font 17152 1 fbcon
bitblit 14464 1 fbcon
softcursor 10496 1 bitblit
uvesafb 38184 0 cn 17324 1 uvesafb
fuse 66112 1
--
Vlad Seliverstov
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