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Andrew Gideon
Guest
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 Posted:
Wed Dec 22, 2004 10:54 pm Post subject:
Question about Infortrend (maybe more generic iSCSI) |
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I've been looking at the Infortrend iSCSI/SATA units, and there's one
glaring aspect: none have dual controllers (for failover).
Is there some fundamental reason for this, perhaps in the nature of iSCSI?
Thanks...
Andrew |
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Guest
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| Posted:
Thu Dec 23, 2004 12:18 am Post subject:
Re: Question about Infortrend (maybe more generic iSCSI) |
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I don't really have an answer for you Andrew, I'm looking for a
clarification to your question.
Are you just looking for a network failover option, or do you want a
"no single point of failure" iSCSI box?
I am sure that I have seen iSCSI boxes with dual netowrk connections
that support failover, but they are not fault tolerant like the FC
storage systems from Engenio and Xyratex are. Is this OK for your
application?
-Jim
Andrew Gideon wrote:
| Quote: | I've been looking at the Infortrend iSCSI/SATA units, and there's one
glaring aspect: none have dual controllers (for failover).
Is there some fundamental reason for this, perhaps in the nature of
iSCSI?
Thanks...
Andrew |
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Andrew Gideon
Guest
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| Posted:
Thu Dec 23, 2004 5:41 am Post subject:
Re: Question about Infortrend (maybe more generic iSCSI) |
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jimwall2000@yahoo.com wrote:
| Quote: | Are you just looking for a network failover option, or do you want a
"no single point of failure" iSCSI box?
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The latter is the "problem".
| Quote: | I am sure that I have seen iSCSI boxes with dual netowrk connections
that support failover, but they are not fault tolerant like the FC
storage systems from Engenio and Xyratex are. Is this OK for your
application?
|
Most - if not all - of the devices I've seem (I'm working my way through the
web, I think {8^) have (at least) dual network ports. I'm looking for full
redundancy.
On page on my screen now is:
http://adjile.com/mass.html
They've an iSCSI product (from Adaptec, I believe), but it doesn't appear to
have dual controllers. Another product on that page (at the top) does have
dual controllers as an option, but it is either FC or SCSI (and also, it
appears, SATA1 drives; at least some Infortrend units appear to use SATA2).
I don't think I've yet to see a dual-controller iSCSI unit. So I'm
wondering if I've just had bad luck so far, or if there's some reason for
this of which I'm ignorant.
- Andrew |
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Andrew Gideon
Guest
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| Posted:
Thu Dec 23, 2004 8:05 am Post subject:
Re: Question about Infortrend (maybe more generic iSCSI) |
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Andrew Gideon wrote:
| Quote: | I don't think I've yet to see a dual-controller iSCSI unit. So I'm
wondering if I've just had bad luck so far, or if there's some reason for
this of which I'm ignorant.
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It was [bad] luck. Equallogic does this.
- Andrew |
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flux
Guest
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| Posted:
Thu Dec 23, 2004 8:05 am Post subject:
Re: Question about Infortrend (maybe more generic iSCSI) |
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In article <3148768.exFYJbOoZW@no.to.be.used.news.int.tagonline.com>,
Andrew Gideon <cR182Driver45@gideon.org> wrote:
| Quote: | I've been looking at the Infortrend iSCSI/SATA units, and there's one
glaring aspect: none have dual controllers (for failover).
|
There is another: poor tech support. After the company moved, their
director of tech support left the company. The person who took over also
left the company. The tech people they have had there in 2003 were
relatively new to the company and its products, and their staff was
limited. I don't know what their current situation is.
I could also say that at least two units of their older SCSI controllers
worked exceptionally well at garbling all the data on the RAID drives
under their control and erroneously blaming the problem on the drives or
not even being aware there was any problem. That's a small anecdote,
FWIW. |
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pras
Guest
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Thu Dec 23, 2004 8:05 am Post subject:
Re: Question about Infortrend (maybe more generic iSCSI) |
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I was looking at NetApp FAS270c recently. They mention Failover capable
but not sure if that means dual controllers. NetApp controller or
'shrunken head' as they call it, ' hosts only single processor (
running Data ONTAP ) along with dual Gb NICs and dual FC ports. It does
not account for 'single point of failure' for controller as such. I am
not sure if another shrunken head is taken on board, will it provide
redundancy.
Pras |
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vinayg@gmail.com
Guest
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Tue Dec 28, 2004 12:47 am Post subject:
Re: Question about Infortrend (maybe more generic iSCSI) |
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The FAS270c has dual controllers capable of failover and failback. In
normal mode of operation each controller works as an independent unit
but if one of the controllers fail the partner can take over the
responsibilities of the failed controller in a seamless fashion which
is transparent to the host. So it is possible to configure these
systems such that there is no spof.
Vinay |
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