Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-09-02 Thread Roch Bourbonnais 


Unlike NFS which can issue sync writes and async writes, iscsi needs  
to be serviced with synchronous semantics (unless the write caching is  
enabled, caveat emptor).
If the workloads issuing the iscsi request is single threaded, then  
performance is governed by I/O size over rotational latency and that  
is often dismall.


Some form of solid state acceleration becomes a must for iscsi and is  
very often of benefit for NFS.


-r

Le 25 août 09 à 08:38, Duncan Groenewald a écrit :



On Aug 24, 2009, at 10:02 PM, "LEES, Cooper"
 wrote:


Hi Duncan,

I also do the same with my Mac for timemachine and

get the same WOEFUL

performance to my x4500 filer.

I have mounted ISCSI zvols on a linux machine and

it performs as

expected
(50 mbytes a second) as apposed to my Mac that goes

@ 1mbyte a

second. I do
believe the client for Mac is crap. Would be nice

if apple wrote a

client
for ISCSI.

But if anyone has a fix for Mac OS X that would be

great to know !

You know you can do time machine on NFS. An SSD drive
will also go a
long way too, you really on need a 16GB one for an
slog.

-Ross



How do you set it up under NFS ?  I managed to get one of my Macs to  
backup to a ZFS share but this is a smb share not an NFS share.


Can you post details on how to use an NFS share for time machine.   
iSCSI seems to be very easy to setup but is way too slow to be useful.


Thanks
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-26 Thread Duncan Groenewald 
All fixed now ...  Backup has been running for maybe a minute or two and has 
backed up over 1GB.

Thanks guys...

Here is the complete command set I used...

Creating the ZFS iSCSI target using COMSTAR.

1.  DO NOT use "ZFS set shareiscsi=on ..."  
2.  MAKE SURE your zpool is upgraded.  Run "zpool upgrade" to see and "zpool 
upgrade storagepool" to upgrade

Commands

01:~# [b]itadm create-target[/b]
Target iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f successfully 
created

02:~# [b]itadm list-target -v[/b]
TARGET NAME STATE SESSIONS
iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f online 0
alias: -
auth: none (defaults)
targetchapuser: -
targetchapsecret: unset
tpg-tags: default

03:~# [b]zfs create storagepool/backups/iscsi[/b]

04:~# [b]zfs create -V 200g storagepool/backups/iscsi/macbook_dg[/b]

05:~# [b]sbdadm create-lu /dev/zvol/rdsk/storagepool/backups/iscsi/macbook_dg
[/b]
06:~# [b]stmfadm list-lu -v[/b]
LU Name: 600144F827723ED54A95FD4B0002
Operational Status: Online
Provider Name : sbd
Alias : /dev/zvol/rdsk/storagepool/backups/iscsi/macbook_dg
View Entry Count  : 0
Data File : /dev/zvol/rdsk/storagepool/backups/iscsi/macbook_dg
Meta File : not set
Size  : 214748364800
Block Size: 512
Vendor ID : SUN 
Product ID: COMSTAR 
Serial Num: not set
Write Protect : Disabled
Writeback Cache   : Enabled

07:~# [b]stmfadm list-target -v[/b]
Target: iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f
Operational Status: Online
Provider Name : iscsit
Alias : -
Sessions  : 0

08:~# [b]stmfadm list-view -l 600144F827723ED54A95FD4B0002[/b]
stmfadm: 600144f827723ed54a95fd4b0002: no views found

09:~# [b]stmfadm add-view 600144F827723ED54A95FD4B0002[/b]

10:~# [b]stmfadm list-view --lu-name 600144F827723ED54A95FD4B0002[/b]
View Entry: 0
Host group   : All
Target group : All
LUN  : 0
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-26 Thread Duncan Groenewald 
Cool - just found the problem.  I had to upgrade the zpool using 
   upgrade zpool storagepool

onwards...
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-26 Thread Duncan Groenewald 
No unfortunately the type does not fix it !!

Still stuck !!
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Tim Cook 
On Wed, Aug 26, 2009 at 12:09 AM, Duncan Groenewald <
dagroenew...@optusnet.com.au> wrote:

> That was a typo, missing an s - I copied the incorrect line from the
> terminal...
>
> sbdadm create-lu /dev/zvol/rdsk/storagepool/backups/isci/macbook_dg
>
> Blog is here...
>
> http://www.cuddletech.com/blog/pivot/entry.php?id=968
> --
>

So the typo fixed it?

--Tim
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
That was a typo, missing an s - I copied the incorrect line from the terminal...

sbdadm create-lu /dev/zvol/rdsk/storagepool/backups/isci/macbook_dg

Blog is here...

http://www.cuddletech.com/blog/pivot/entry.php?id=968
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Tim Cook 
On Tue, Aug 25, 2009 at 11:14 PM, Duncan Groenewald <
dagroenew...@optusnet.com.au> wrote:

> Oops I left that bit out...
>
> dun...@osshsrvr:~# itadm create-target
> Target iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f
> successfully created
> dun...@osshsrvr:~# itadm list-target -v
> TARGET NAME  STATE
>  SESSIONS
> iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f  online   0
>   alias:  -
>   auth:   none (defaults)
>   targetchapuser: -
>   targetchapsecret:   unset
>   tpg-tags:   default
> dun...@osshsrvr:~# zfs create storagepool/backups/iscsi
> dun...@osshsrvr:~# zfs create -V 200g storagepool/backups/iscsi/macbook_dg
> dun...@osshsrvr:~# sbdadm create-lu
> /dev/zvol/rdsk/storagepool/backups/isci/macbook_dg
> sbdadm: could not create meta file
>

Can you link the blog you got the instructions from?  I'm unsure why you'd
do a zfs create instead of just doing an mkfile.  The only reason I can
think of is if you wanted to take snapshots, and you were storing other data
inside the zfs pool you had other data in (HORRIBLE idea IMO).

Oh, and blatant observation here, did you just make a typo?  Your last line
is incorrect as you've pasted it.  You put:
sbdadm create-lu /dev/zvol/rdsk/storagepool/backups/isci/macbook_dg

If that's what you literally typed, you missed an S in iscsi.  It should be:
sbdadm create-lu /dev/zvol/rdsk/storagepool/backups/iscsi/macbook_dg


*** added by me to make it obvious what you missed :)


If that's not it, from all the documentation I've see, they'd prefer you
used mkfile to create your LUN, and typed the path to the file as
/storagepool/backups/iscsi/macbook_dg.

Reference:
http://de.opensolaris.org/os/project/comstar/COMSTAR_Admin-FC-iSCSI.pdf;jsessionid=2C549A4253A0B211ED9DABBF66EF1495

--Tim (four jamesons later)
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
Oops I left that bit out...

dun...@osshsrvr:~# itadm create-target
Target iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f successfully 
created
dun...@osshsrvr:~# itadm list-target -v
TARGET NAME  STATESESSIONS
iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f  online   0
   alias:  -
   auth:   none (defaults)
   targetchapuser: -
   targetchapsecret:   unset
   tpg-tags:   default
dun...@osshsrvr:~# zfs create storagepool/backups/iscsi
dun...@osshsrvr:~# zfs create -V 200g storagepool/backups/iscsi/macbook_dg
dun...@osshsrvr:~# sbdadm create-lu 
/dev/zvol/rdsk/storagepool/backups/isci/macbook_dg
sbdadm: could not create meta file
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Tim Cook 
On Tue, Aug 25, 2009 at 10:54 PM, Duncan Groenewald <
dagroenew...@optusnet.com.au> wrote:

> OK, I found a blog on COMSTAR and tried creating the iSCSI target using the
> "new" method...
> Seemed to be ok until sbdadm failed - see below...any ideas?
>
> dun...@osshsrvr:~# itadm create-target
> Target iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f
> successfully created
> dun...@osshsrvr:~# itadm list-target -v
> TARGET NAME  STATE
>  SESSIONS
> iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f  online   0
>alias:  -
>auth:   none (defaults)
>targetchapuser: -
>targetchapsecret:   unset
>tpg-tags:   default
> dun...@osshsrvr:~# sbdadm create-lu
> /dev/zvol/rdsk/storagepool/backups/macbook_dg
> sbdadm: could not create meta file
>


I'm not entirely sure what you're trying to do here.  Is
/dev/zvol/rdsk/storagepool/backups/macbook_dg a zfs snapshot?


--Tim
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
OK, I found a blog on COMSTAR and tried creating the iSCSI target using the 
"new" method...
Seemed to be ok until sbdadm failed - see below...any ideas?

dun...@osshsrvr:~# itadm create-target
Target iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f successfully 
created
dun...@osshsrvr:~# itadm list-target -v
TARGET NAME  STATESESSIONS 
iqn.1986-03.com.sun:02:7af8d188-b1e8-4d98-fee1-f4da18bbe46f  online   0
alias:  -
auth:   none (defaults)
targetchapuser: -
targetchapsecret:   unset
tpg-tags:   default
dun...@osshsrvr:~# sbdadm create-lu 
/dev/zvol/rdsk/storagepool/backups/macbook_dg
sbdadm: could not create meta file
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Tim Cook 
On Tue, Aug 25, 2009 at 10:38 PM, Duncan Groenewald <
dagroenew...@optusnet.com.au> wrote:

> Ok, I just completed the upgrade to snv 118 and everything still works
> except the iSCSI is still sloowww...
>
> It is still unclear to me what the COMSTAR iscsi command set is vs the
> older method !!
>
> I presume one cannot use ZFS commands, so could someone point me to a
> description of the new way of doing things ?  BTW what is COMSTAR ?
>


COMSTAR (COmon Multiprotocol Scsi TARget) is the project to unify the "SCSI
target stack" IE: FC, iSCSI, FCOE (although I'm not sure how baked FCOE is
at this point).

http://www.opensolaris.org/os/project/comstar/;jsessionid=507478D1B2496DCEA0A764D4C8A63131

http://wikis.sun.com/display/OpenSolarisInfo/comstar+Administration

--Tim
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
Ok, I just completed the upgrade to snv 118 and everything still works except 
the iSCSI is still sloowww...

It is still unclear to me what the COMSTAR iscsi command set is vs the older 
method !!

I presume one cannot use ZFS commands, so could someone point me to a 
description of the new way of doing things ?  BTW what is COMSTAR ?
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
I am going to upgrade to snv118 and see what happens.

In the meantime would you mind explaining what the new way of configuring 
targets is vs the old way.

Thanks
Duncan
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Colin Morey 
On Tue, Aug 25, 2009 at 12:02:51PM +1000, LEES, Cooper wrote:
> Hi Duncan,
> 
> I also do the same with my Mac for timemachine and get the same WOEFUL
> performance to my x4500 filer.
> 
> I have mounted ISCSI zvols on a linux machine and it performs as expected
> (50 mbytes a second) as apposed to my Mac that goes @ 1mbyte a second. I do
> believe the client for Mac is crap. Would be nice if apple wrote a client
> for ISCSI.
> 
> But if anyone has a fix for Mac OS X that would be great to know !
>

I'm getting >30MB/s to/from my 4x1TB drive array, however I see some
v.slow speeds at the beginning. I believe there were a few things that
helped,
# updating to the latest dev release uname -a reports.
  - SunOS dendrite 5.11 snv_118  i86pc i386 i86pc
# Enableing the write-back cache. I beleive there's some talk of linux 
  clients doing the wrong thing, but that may be NFS,
  - iscsitadm modify admin --fast-write-ack enable
# using the new COMSTAR stack, rather than the old. I think something,
  somewhere was getting confused, there seem to be two versions of
  instructions around. Having migrated an old set of pools onto this 
  system probably didn't help matters.
  - svcs -a | grep -i iscsi
  disabled   Aug_16   svc:/network/iscsi_initiator:default
  disabled   Aug_16   svc:/system/iscsitgt:default
  online Aug_16   svc:/network/iscsi/initiator:default
  online Aug_16   svc:/network/iscsi/target:default

Hope that helps someone, thanks go to the people in #opensolaris on
freenode who helped me get this sorted.

Cheers,

Colin Morey



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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Colin Morey 
On Tue, Aug 25, 2009 at 09:05:47AM -0400, Peter Cudhea wrote:
> The ZFS set shareiscsi=on mechanism is only used with the iscsitgt and not 
> with COMSTAR iscsi/target.   Since you shifted to using iscsi/target, it 
> should not be working for you now.  
> Could it be that somehow you ended up with both kinds of target (iscsitgt 
> and comstar iscsi/target) running at the same time, and that iscsitgt 
> "owns" the well known port of 3260.   Could you run "svcs iscsitgt" to 
> verify that the iscsitgt service is off?  
> Other posters have agreed with you  that performance is much worse for the 
> GlobalSAN OSX initiator than for an equivalent Linux initiator.
>
> Peter
I'll try and get some nice benchmarks for you to counter-act this, but I
know that I problems with the same initiator, until I dropped the old
style of configuring the targets and went down the new method. 

I have access to the sun server side at the moment, but the mac is off-net at
the moment due to an office move.

I do seem to recall I had a problem getting one of the dependant
services started, but I think i resolved that with a reboot.

Cheers,

Colin


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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Peter Cudhea 
The ZFS set shareiscsi=on mechanism is only used with the iscsitgt and 
not with COMSTAR iscsi/target.   Since you shifted to using 
iscsi/target, it should not be working for you now.  

Could it be that somehow you ended up with both kinds of target 
(iscsitgt and comstar iscsi/target) running at the same time, and that 
iscsitgt "owns" the well known port of 3260.   Could you run "svcs 
iscsitgt" to verify that the iscsitgt service is off?  

Other posters have agreed with you  that performance is much worse for 
the GlobalSAN OSX initiator than for an equivalent Linux initiator.


Peter


On 08/25/09 07:29, Duncan Groenewald wrote:

Mmm - OK I think I managed to start things by using the "itadm create-target" 
command.  Anyone's guess as to how this knows to share the ZFS iscsi shares but it seems 
to do so...

Anyway performance is still really bad !!!  Perhaps it is the GlobalSAN OSX 
initiator that is not good !
  

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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
Mmm - OK I think I managed to start things by using the "itadm create-target" 
command.  Anyone's guess as to how this knows to share the ZFS iscsi shares but 
it seems to do so...

Anyway performance is still really bad !!!  Perhaps it is the GlobalSAN OSX 
initiator that is not good !
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Darren J Moffat 

Duncan Groenewald wrote:

Thanks - what is the chance of something breaking if I do this ??


It should work just fine but do read the release notes here:

http://mail.opensolaris.org/pipermail/opensolaris-announce/2009-July/002240.html

Plus you will be able to go back and boot your snv_111 build if it does.


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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
Thanks - what is the chance of something breaking if I do this ??
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
BTW I fixed the /iscsi/target problem by starting the stmf service ...

Still I don't see the iSCSI targets listed and when I run ZFS set shareiscsi=on 
 I get an error complaining that the /iscsitgt service is not running ??

I presume the ZFS iscsi commands don't work with the /iscsi/target service ? 
(or something??)

Thanks
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Darren J Moffat 

Duncan Groenewald wrote:


Is there an easy way to update to snv_118 ?  I am using 2009.06 (snv_111).


# pkg set-authority -O http://pkg.opensolaris.org/dev opensolaris.org
# pkg image-update
# init 6

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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Duncan Groenewald 
> On Tue, Aug 25, 2009 at 12:02:51PM +1000, LEES,
> Cooper wrote:
> > Hi Duncan,
> >=20
> > I also do the same with my Mac for timemachine and
> get the same WOEFUL
> > performance to my x4500 filer.
> >=20
> > I have mounted ISCSI zvols on a linux machine and
> it performs as expected
> > (50 mbytes a second) as apposed to my Mac that goes
> @ 1mbyte a second. I =
> do
> > believe the client for Mac is crap. Would be nice
> if apple wrote a client
> > for ISCSI.
> >=20
> > But if anyone has a fix for Mac OS X that would be
> great to know !
> >
> 
> I'm getting >30MB/s to/from my 4x1TB drive array,
> however I see some
> v.slow speeds at the beginning. I believe there were
> a few things that
> helped,
> # updating to the latest dev release uname -a
> reports.
>   - SunOS dendrite 5.11 snv_118  i86pc i386 i86pc
> leing the write-back cache. I beleive there's some
> talk of linux=20
>   clients doing the wrong thing, but that may be NFS,
> - iscsitadm modify admin --fast-write-ack enable
> ing the new COMSTAR stack, rather than the old. I
> think something,
> somewhere was getting confused, there seem to be
>  two versions of
> instructions around. Having migrated an old set of
>  pools onto this=20
>  system probably didn't help matters.
>  - svcs -a | grep -i iscsi
> disabled   Aug_16
>svc:/network/iscsi_initiator:default
> disabled   Aug_16
>svc:/system/iscsitgt:default
> online Aug_16
>svc:/network/iscsi/initiator:default
> online Aug_16
>svc:/network/iscsi/target:default
> pe that helps someone, thanks go to the people in
> #opensolaris on
> freenode who helped me get this sorted.
> 
> Cheers,
> 
> Colin Morey
> 

Colin - thanks.  

Is there an easy way to update to snv_118 ?  I am using 2009.06 (snv_111).

I had svc:/system/iscsitgt:default online and svc:/network/iscsi/target:default 
offline, however I can't get /iscsi/target to start.  It just reports back as 
Offline after I run "svcadm enable ..."   - any idea why it would not startup ? 
 Do I need to restart the server ?

What is the difference between iscsitgt and the other ?

Thanks
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-25 Thread Colin Morey 
On Tue, Aug 25, 2009 at 12:02:51PM +1000, LEES, Cooper wrote:
> Hi Duncan,
>=20
> I also do the same with my Mac for timemachine and get the same WOEFUL
> performance to my x4500 filer.
>=20
> I have mounted ISCSI zvols on a linux machine and it performs as expected
> (50 mbytes a second) as apposed to my Mac that goes @ 1mbyte a second. I =
do
> believe the client for Mac is crap. Would be nice if apple wrote a client
> for ISCSI.
>=20
> But if anyone has a fix for Mac OS X that would be great to know !
>

I'm getting >30MB/s to/from my 4x1TB drive array, however I see some
v.slow speeds at the beginning. I believe there were a few things that
helped,
# updating to the latest dev release uname -a reports.
  - SunOS dendrite 5.11 snv_118  i86pc i386 i86pc
# Enableing the write-back cache. I beleive there's some talk of linux=20
  clients doing the wrong thing, but that may be NFS,
  - iscsitadm modify admin --fast-write-ack enable
# using the new COMSTAR stack, rather than the old. I think something,
  somewhere was getting confused, there seem to be two versions of
  instructions around. Having migrated an old set of pools onto this=20
  system probably didn't help matters.
  - svcs -a | grep -i iscsi
  disabled   Aug_16   svc:/network/iscsi_initiator:default
  disabled   Aug_16   svc:/system/iscsitgt:default
  online Aug_16   svc:/network/iscsi/initiator:default
  online Aug_16   svc:/network/iscsi/target:default

Hope that helps someone, thanks go to the people in #opensolaris on
freenode who helped me get this sorted.

Cheers,

Colin Morey



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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-24 Thread Duncan Groenewald 
> 
> On Aug 24, 2009, at 10:02 PM, "LEES, Cooper"
>  wrote:
> 
> > Hi Duncan,
> >
> > I also do the same with my Mac for timemachine and
> get the same WOEFUL
> > performance to my x4500 filer.
> >
> > I have mounted ISCSI zvols on a linux machine and
> it performs as  
> > expected
> > (50 mbytes a second) as apposed to my Mac that goes
> @ 1mbyte a  
> > second. I do
> > believe the client for Mac is crap. Would be nice
> if apple wrote a  
> > client
> > for ISCSI.
> >
> > But if anyone has a fix for Mac OS X that would be
> great to know !
> 
> You know you can do time machine on NFS. An SSD drive
> will also go a  
> long way too, you really on need a 16GB one for an
> slog.
> 
> -Ross
> 

How do you set it up under NFS ?  I managed to get one of my Macs to backup to 
a ZFS share but this is a smb share not an NFS share.

Can you post details on how to use an NFS share for time machine.  iSCSI seems 
to be very easy to setup but is way too slow to be useful.

Thanks
-- 
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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-24 Thread LEES, Cooper 
Ross,

Do you have any links to doco / blog posts for time machine over NFS? I
would love to do this ... I have mounted NFS before with "Connect to Server"
/ Automoutner but don't know how to get Mac OS X to see it as a valid 'disk'
to backup to.

Ta,
Cooper


On 25/08/09 2:10 PM, "Ross Walker"  wrote:

> 
> On Aug 24, 2009, at 10:02 PM, "LEES, Cooper"  wrote:
> 
>> Hi Duncan,
>> 
>> I also do the same with my Mac for timemachine and get the same WOEFUL
>> performance to my x4500 filer.
>> 
>> I have mounted ISCSI zvols on a linux machine and it performs as
>> expected
>> (50 mbytes a second) as apposed to my Mac that goes @ 1mbyte a
>> second. I do
>> believe the client for Mac is crap. Would be nice if apple wrote a
>> client
>> for ISCSI.
>> 
>> But if anyone has a fix for Mac OS X that would be great to know !
> 
> You know you can do time machine on NFS. An SSD drive will also go a
> long way too, you really on need a 16GB one for an slog.
> 
> -Ross
> 

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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-24 Thread Ross Walker 


On Aug 24, 2009, at 10:02 PM, "LEES, Cooper"  wrote:


Hi Duncan,

I also do the same with my Mac for timemachine and get the same WOEFUL
performance to my x4500 filer.

I have mounted ISCSI zvols on a linux machine and it performs as  
expected
(50 mbytes a second) as apposed to my Mac that goes @ 1mbyte a  
second. I do
believe the client for Mac is crap. Would be nice if apple wrote a  
client

for ISCSI.

But if anyone has a fix for Mac OS X that would be great to know !


You know you can do time machine on NFS. An SSD drive will also go a  
long way too, you really on need a 16GB one for an slog.


-Ross

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Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

2009-08-24 Thread LEES, Cooper 
Hi Duncan,

I also do the same with my Mac for timemachine and get the same WOEFUL
performance to my x4500 filer.

I have mounted ISCSI zvols on a linux machine and it performs as expected
(50 mbytes a second) as apposed to my Mac that goes @ 1mbyte a second. I do
believe the client for Mac is crap. Would be nice if apple wrote a client
for ISCSI.

But if anyone has a fix for Mac OS X that would be great to know !

Ta,
-- 
Cooper Ry Lees
HPC / UNIX Systems Administrator - Information Management Services (IMS)
Australian Nuclear Science and Technology Organisation
T  +61 2 9717 3853
F  +61 2 9717 9273
M  +61 403 739 446
E  cooper.l...@ansto.gov.au
www.ansto.gov.au 

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On 25/08/09 11:57 AM, "Duncan Groenewald" 
wrote:

> Hi,  I have just setup an ISCSI volume on ZFS to use with OS X as a backup
> disk but performance is extremely bad.  I am using the GlobalSAN iSCSI
> initiator.  
> 
> Without getting into too much detail does anyone know whether there is a
> reason why an iSCSI device seems to perform so badly ?  I have configured the
> iSCSI device as a Time Machine drive the backup is very very slow.
> 
> I have also seen a number of postings about the ZIL being the problem and
> needing to put in a fast SSD drive to address this.
> 
> If anyone has a good explanation of what this problem is and how to fix it
> please let me know.  I am using a small PC with 4 x1TB SATA drives as a file
> server running OpenSolaris 2009.06.
> 
> Thanks

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