sfcredfox
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- Aug 26, 2014
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Question: Has anyone ever used their M1015 to connect to external storage (JBOD) enclosure?
If so, can you use SFF-8088?
Scenario:
I am interested if you can connect an HP MSA70 (it's a 25 disk enclosure, uses SFF-8088) to an IBM M1015.
This would require the M1015 being able to be cabled to an enclosure using SFF-8088, which the M1015 uses 8087 internal ports.
References:
https://forums.freenas.org/index.php?threads/confused-about-that-lsi-card-join-the-crowd.11901/
Post about the M1015. Describes flashing and drive configuration, but not connections to external. I have heard you can get different SAS cables from JGreco, but not sure if it supports the above scenario.
http://sale.sfpcables.com/cab-8088-8087-p1m?gclid=CNXB5qj17cECFeU-Mgod7zMAvA
Here's the cable in question, it exists, but would doing this work? Hmm.
http://h20565.www2.hp.com/portal/si...ac.admitted=1415548382258.876444892.492883150
MSA70. It's currently connected to an LSI SAS HBA (using SFF-8088) and working perfectly, just curious about the M1015 to do the same thing.
=============================
The side of performance question:
Does anyone have data or found posts about SAS expanders? I'm trying to understand the channels and bandwidth aspect of SAS, but it's still not clear.
I guess the performance question is: Does using an architecture that utilizes a SAS expander cut your available bandwidth to disk? (I think yes, because we are splitting/switching in some manner)
If so, is it significant enough to even matter or can you loose performance for capacity? Are we hurting read/write performance significantly?
Tons of storage scenarios use expanders, does FreeNAS care? Do you?
References:
https://forums.freenas.org/index.php?threads/sas-expanders.22626/
Suggests that they are supported and are being used
http://www.sasexpanders.com/
Provides pretty good example of the scenario in question, also some example LSI cards
http://www.sasexpanders.com/vs/controllers/ -see nonHBA cards, just looking at examples, not a purchase list
If so, can you use SFF-8088?
Scenario:
I am interested if you can connect an HP MSA70 (it's a 25 disk enclosure, uses SFF-8088) to an IBM M1015.
This would require the M1015 being able to be cabled to an enclosure using SFF-8088, which the M1015 uses 8087 internal ports.
References:
https://forums.freenas.org/index.php?threads/confused-about-that-lsi-card-join-the-crowd.11901/
Post about the M1015. Describes flashing and drive configuration, but not connections to external. I have heard you can get different SAS cables from JGreco, but not sure if it supports the above scenario.
http://sale.sfpcables.com/cab-8088-8087-p1m?gclid=CNXB5qj17cECFeU-Mgod7zMAvA
Here's the cable in question, it exists, but would doing this work? Hmm.
http://h20565.www2.hp.com/portal/si...ac.admitted=1415548382258.876444892.492883150
MSA70. It's currently connected to an LSI SAS HBA (using SFF-8088) and working perfectly, just curious about the M1015 to do the same thing.
=============================
The side of performance question:
Does anyone have data or found posts about SAS expanders? I'm trying to understand the channels and bandwidth aspect of SAS, but it's still not clear.
I guess the performance question is: Does using an architecture that utilizes a SAS expander cut your available bandwidth to disk? (I think yes, because we are splitting/switching in some manner)
If so, is it significant enough to even matter or can you loose performance for capacity? Are we hurting read/write performance significantly?
Tons of storage scenarios use expanders, does FreeNAS care? Do you?
References:
https://forums.freenas.org/index.php?threads/sas-expanders.22626/
Suggests that they are supported and are being used
http://www.sasexpanders.com/
Provides pretty good example of the scenario in question, also some example LSI cards
http://www.sasexpanders.com/vs/controllers/ -see nonHBA cards, just looking at examples, not a purchase list