Noemi Alvarez | 29 Jul 10:23 2014
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Hello


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Lee Duncan | 26 Jul 01:46 2014

Can VPD Unit Serial Number be persistent?

Hi:

I am creating an iSCSI LUNs using iblock back end storage.

I notice that my VPD Unit Serial Number is different each time my server
reboots. That does not seem right.

Is this a bug?

I looked back through the list archives and saw that you do not allow
this attribute to be set at back store creation time, but there is an
option to tell it not generate a WWN. (using generate_wwn=false)

But when I do that I get no VPD Page 0x83 data at all, and the name of
the resulting target, once connected, in /dev/disk/by-id is scsi-1LIO-ORG.

It does not seem right that the identity of the disc changes each time
the server is rebooted.
--

-- 
Lee Duncan

jgross | 25 Jul 13:37 2014

[PATCH V2 0/4] Add XEN pvSCSI support

This series adds XEN pvSCSI support. With pvSCSI it is possible to use physical
SCSI devices from a XEN domain.

The support consists of a backend in the privileged Domain-0 doing the real
I/O and a frontend in the unprivileged domU passing I/O-requests to the backend.

The code is taken (and adapted) from the original pvSCSI implementation done
for Linux 2.6 in 2008 by Fujitsu.

[PATCH V2 1/4] Add XEN pvSCSI protocol description
[PATCH V2 2/4] Introduce xen-scsifront module
[PATCH V2 3/4] Introduce XEN scsiback module
[PATCH V2 4/4] add xen pvscsi maintainer

Changes in V2:
- use core target infrastructure by backend instead of pure SCSI passthrough
- add support for larger SG lists by putting them in grant page(s)
- add command abort capability
Fabian Morision | 24 Jul 14:47 2014
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Wang Sheng-Hui | 22 Jul 08:15 2014
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[PATCH] rtslib: trivial update to README.md


The installation from source also requres pyparsing module.
Update the requirement in the README.md

Signed-off-by: Wang Sheng-Hui <shhuiw <at> gmail.com>
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b0ca49b..6731226 100644
--- a/README.md
+++ b/README.md
 <at>  <at>  -34,7 +34,7  <at>  <at>  you're familiar with your Linux Distribution's package manager:

        * GNU Make.
        * python 2.6 or 2.7
-       * A few python libraries: ipaddr, netifaces, configobj, python-epydoc
+       * A few python libraries: pyparsing, ipaddr, netifaces, configobj, python-epydoc
        * A working LaTeX installation and ghostscript for building the
          documentation, for example texlive-latex.
        * Your favorite distribution's package developement tools, like rpm for
--

-- 
1.8.3.2

Martin Svec | 17 Jul 20:51 2014
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WRITE_SAME performance

Hello,

I noticed that LIO's WRITE_SAME implementation doesn't perform as well as I would expect. In fact,
non-accelerated ESXi eager disk zeroing over 10GE iSCSI is two times faster than the accelerated
zeroing in our test lab.

Initiator setup: Dell R300, ESXi 5.5, software iSCSI over 1GE/10GE.
Target setup: Dell R510, PERC H700 controller, 3x Intel S3700 SSD in RAID0, exported as iblock iSCSI
LUN, 3.15.5 kernel.

After some digging in sources and playing with blktrace, I think the problem comes from the way
iblock_execute_write_same() handles sequential writes. It adds them to bios in small 512-byte
blocks, i.e. one sector at a time. On the other hand, ESXi issues the non-accelerated writes as
128kB blocks. The difference in blktrace output is obvious. I tried to tweak deadline scheduler and
other tunables, but with no luck. To verify my idea, I modified iblock_execute_write_same() so that
it submits full ZERO_PAGEs by analogy with __blkdev_issue_zeroout(). In other words, I increased bio
blocks size from 512 to 4096 bytes. This quick dirty hack raised WRITE_SAME performance several
times and it's close to the maximal sequential write speed of the raw device now. Moreover, target
CPU usage and softirqs dropped significantly too.

Maybe iblock_execute_write_same() should prepare longer contiguous data block before it starts
submitting it to the block layer? And/or use ZERO_PAGE if it is used for zeroing (99% cases today, I
guess).

Any ideas?

Thanks,
Martin

(Continue reading)

Manuel Buil | 17 Jul 14:42 2014
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cache modes in LIO

Hi,

One newby question: I create a iSCSI target using my local disk device /dev/sdb (iBLOCK type of backstore).
Is there a way in the CLI to specify the cache mode that LIO uses when opening the /dev/sdb device (O_SYNC or
O_DIRECT or...)?

Thank you,
Manuel
Matyas Koszik | 16 Jul 16:18 2014
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iscsi-target OOPS


Hi,

I'm running a redundant storage server pair with DRBD and LIO. On the
secondary node I had some RAID card resets, which triggered DRBD to
disconnect the node - but before that, requests were held for several
seconds in the DRBD layer, which seems to be a problem for LIO (or maybe
the subsequent initiator reconnects - I'm not sure).

My efforts to reproduce the bug in a test environment failed so far, but
in production it works reliably (the RAID card in the secondary node
stalled 3 times and the primary node crashed every time). I've tried
upgrading the kernel between crashes 1 and 2, but that didn't help.

Regards,

Matyas

1st crash:

emerg kernel: [6995187.657152] general protection fault: 0000 [#3] SMP
warning kernel: [6995187.657292] CPU 3
warning kernel: [6995187.657333] Modules linked in: tcm_loop tcm_fc iscsi_target_mod
target_core_pscsi target_core_file target_core_iblock target_core_mod nfnetlink_log nfnetlink
dm_snapshot usb_storage parport_pc ppdev lp parport drbd lru_cache libfc scsi_transport_fc scsi_tgt
configfs bnep rfcomm bluetooth rfkill uinput nfsd nfs nfs_acl auth_rpcgss fscache lockd sunrpc
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4
xt_state nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables loop snd_pcm snd_page_alloc
snd_timer acpi_cpufreq iTCO_wdt iTCO_vendor_support joydev mperf i7core_edac processor snd
soundcore psmouse i2c_i801 coretemp serio_raw ioatdma edac_core i2c_core pcspkr evdev thermal_sys
(Continue reading)

pviltard | 12 Jul 22:22 2014
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Don't see the disk

Hello Andy,

This afternoon, after the iscsi target, I remake the configuration on the server.

I don't touch the precedante configuration on the swicht fiber channel, the card are the same, the
initiator is a solarix x86. Same configuration, after the lost of the target's disk.

Before the crash, I have this version : targetcli-2.1.fb34-1.fc20.noarch.rpm, it is hard but I found the
missing switch SanBox2 configuration.

But today, I have targetcli.noarch                         2.1.fb35-1.fc20                <at> updates

My qla2xxx is good : 
--------------->
/qla2xxx> ls
o- qla2xxx ............................................................. [Targets: 1]
  o- naa.2100001b3215dd57 ................................................ [gen-acls]
    o- acls ............................................................... [ACLs: 1]
    | o- naa.2000001b3206f1a1 ...................................... [Mapped LUNs: 1]
    |   o- mapped_lun0 ................................ [lun0 fileio/bs_fc_test (rw)]
    o- luns ............................................................... [LUNs: 1]
      o- lun0 ............................ [fileio/bs_fc_test (/dev/vgdata/lvdiskfc)]
---------->

But on the initiator solaris x86 I have :

# cfgadm -al
Ap_Id                          Type         Receptacle   Occupant     Condition
c0                             scsi-sata    connected    configured   unknown
c0::dsk/c0t1d0                 disk         connected    configured   unknown
(Continue reading)

pviltard | 7 Jul 18:33 2014
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Could not create NetworkPortal in configFS

Hello,

I have a trouble with iscsi.

I destroy my Fedora 20 accidentally so I rebuild another.

[root <at> philippe ~]# uname -a
Linux philippe.pvi.org 3.14.9-200.fc20.x86_64 #1 SMP Thu Jun 26 21:40:51 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[root <at> philippe ~]# yum list | grep rtslib
python-rtslib.noarch                     2.1.fb48-1.fc20                <at> updates
python-rtslib-doc.noarch                 2.1.fb48-1.fc20               updates
python3-rtslib.noarch                    2.1.fb48-1.fc20               updates

I create lun, fileio, qla2xxx, iqn

but :

$ ssh -Y root <at> philippe
root <at> philippe's password:
Last login: Mon Jul  7 18:00:01 2014 from pierre.pvi.org
[root <at> philippe ~]# targetcli
targetcli shell version 2.1.fb35
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/iscsi/iqn.20.../tpg1/portals> cd ..
/iscsi/iqn.20...886f03c3/tpg1> ls
o- tpg1
.....................................................................................................
(Continue reading)

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