Re: sg_persist triggers block kernel event ???

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Adding more information to this case,

also reproduced on a sles11 and with mpathpersist in place of sg_persist (sde and sdf are paths of dm-4) :

# mpathpersist -i -k /dev/mapper/igrM2h-U2Ci-O3jL 
KERNEL[1399153645.728611] change   /devices/platform/host2/session1/target2:0:0/2:0:0:2/block/sdf (block)
UDEV_LOG=3
ACTION="">
DEVPATH=/devices/platform/host2/session1/target2:0:0/2:0:0:2/block/sdf
SUBSYSTEM=block
DEVNAME=sdf
DEVTYPE=disk
SEQNUM=1811
MAJOR=8
MINOR=80

KERNEL[1399153645.729377] change   /devices/platform/host3/session2/target3:0:0/3:0:0:2/block/sde (block)
UDEV_LOG=3
ACTION="">
DEVPATH=/devices/platform/host3/session2/target3:0:0/3:0:0:2/block/sde
SUBSYSTEM=block
DEVNAME=sde
DEVTYPE=disk
SEQNUM=1812
MAJOR=8
MINOR=64

Persistent Reserve IN command failed

KERNEL[1399153645.730116] change   /devices/virtual/block/dm-4 (block)
UDEV_LOG=3
ACTION="">
DEVPATH=/devices/virtual/block/dm-4
SUBSYSTEM=block
DEVNAME=dm-4
DEVTYPE=disk
SEQNUM=1813
MAJOR=252
MINOR=4

Regards,
Christophe Varoqui


On Sat, May 3, 2014 at 10:38 PM, Christophe Varoqui <christophe.varoqui@xxxxxxxxxxx> wrote:
Reproduced on a fairly recent kernel :

cvaroqui@clementine:~$ sudo sg_persist -k /dev/sda
  ATA       SAMSUNG MZMTD512  DXT4
  Peripheral device type: disk
PR in: command not supported

KERNEL[227056.238465] change   /devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sda (block)
ACTION="">
DEVNAME=/dev/sda
DEVPATH=/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sda
DEVTYPE=disk
MAJOR=8
MINOR=0
SEQNUM=2603
SUBSYSTEM=block

cvaroqui@clementine:~$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu Trusty Tahr (development branch)"

cvaroqui@clementine:~$ uname -a
Linux clementine 3.13.0-23-generic #45-Ubuntu SMP Fri Apr 4 06:58:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Regards,
Christophe Varoqui


On Sat, May 3, 2014 at 10:12 PM, Christophe Varoqui <christophe.varoqui@xxxxxxxxxxx> wrote:
Hi list,

I observe this on a debian 7.5 server with a udevadm monitor running in the background :

# sg_persist -n -k /dev/sdbh
  PR generation=0x0, there are NO registered reservation keys

KERNEL[448809.342461] change   /devices/pci0000:20/0000:20:02.2/0000:24:00.0/host0/rport-0:0-3/target0:0:1/0:0:1:12/block/sdbh (block)
ACTION="">
DEVNAME=/dev/sdbh
DEVPATH=/devices/pci0000:20/0000:20:02.2/0000:24:00.0/host0/rport-0:0-3/target0:0:1/0:0:1:12/block/sdbh
DEVTYPE=disk
MAJOR=67
MINOR=176
SEQNUM=261605
SUBSYSTEM=block

Every sg_persist command, with any options, trigger events.

On this server with more than 200 scsi devices, each receiving one read-key and one read-reservation every 10 minutes, this triggers quite a eavy load caused by 2 udev triggers :

1/ multipath -v0 $devpath
2/ udisks-lvm-pv-export $pv_uuid


Question is, is it normal for a "--in" sg_persist command to trigger a change event on the scsi device ? If not, what we can do about it ?

Best regards,
Christophe Varoqui



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