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Conference ssag::ask_ssag

Title:	Ask the Storage Architecture Group
Notice:	Check out our web page at http://www-starch.shr.dec.com
Moderator:	SSAG::TERZAN

Created:	Wed Oct 15 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	6756
Total number of notes:	25276

6508.0. "More questions !Personality mods/2X fans" by MAASUP::TURRO (Make it so number 1) Mon Mar 24 1997 16:08

    Are there temperature problems if installing RZ29-xx in a
    BA350-xx without the 2X fans,ie can u only install so many RZ29s per
    shelf without the 2X fans. Or is that strictly verboten? 
    
    Ie cooling issues this would also apply to SW800,SW500,SW300 cabinets.
    
    I have a customer that has LEDS on all of his 8 bit personality
    modules. Some have both on (most) some have 1 on!
    
    A precise meaning to the light status on the 8 bit & 16 bit personality
    mods would be helpful.
    
    Also criteria for installing internal cabinet fans in the above 
    cabinets would be very helpful..With part numbers if you have em!!!
    IE at what point must the Cabinet fans be installed ????
    
    
    Thanks
    Mike Turro
    Baltimore MCS
    For  offline discussions [email protected]

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6508.1 HOUNDD::BASSETT Bill Mon Mar 24 1997 16:31 31

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6508.1		HOUNDD::BASSETT	Bill	`Mon Mar 24 1997 16:31`	31
	Mike, see earlier note for LED meaning.... When one has 7200 RPM drives in Storageworks, there are specific rules about cooling. 1) In a pedestal application, dual speed blowers are required along with foam blocks to stop recirculation. 2) In a cabinet (SW500/SW800) the fan tray assembly is required. (DUAL SPEED BLOWERS ARE NOT REQUIRED.) 3) All SW300 and BA356's shipped with dual speed blowers. Late model BA350's shipped with dual speed blowers. 4) Early BA350's CANNOT use the dual speed blower since the backplane does not include the "Dual speed line." (Backplane rev F is not upgradeable, rev H is required.) 5) Quantity of drives per shelf is NOT an issue. Each SBB is allocated so much airflow. The old blower CANNOT supply enough airflow to the individual SBB in a fan failed condition to adequately cool the drive (only the 7200 RPM drives) inside the SBB. So even one drive in the BA350 can have a problem. [Interesting enough, one drive is the WORSE CASE condition.] The number of drives per shelf limitation is related to power not cooling. (BA35X-HF is required for 7 drives.) Bill

    Mike,
    
    see earlier note for LED meaning....
    
    When one has 7200 RPM drives in Storageworks, there are specific rules
    about cooling.
    
    1) In a pedestal application, dual speed blowers are required along
    with foam blocks to stop recirculation.
    
    2) In a cabinet (SW500/SW800) the fan tray assembly is required.  (DUAL 
    SPEED BLOWERS ARE NOT REQUIRED.)  
    
    3) All SW300 and BA356's shipped with dual speed blowers.  Late model
    BA350's shipped with dual speed blowers.
    
    4) Early BA350's CANNOT use the dual speed blower since the backplane
    does not include the "Dual speed line."  (Backplane rev F is not
    upgradeable, rev H is required.)
    
    5) Quantity of drives per shelf is NOT an issue.  Each SBB is allocated
    so much airflow.  The old blower CANNOT supply enough airflow to the
    individual SBB in a fan failed condition to adequately cool the drive
    (only the 7200 RPM drives) inside the SBB.  So even one drive in the
    BA350 can have a problem.  [Interesting enough, one drive is the WORSE
    CASE condition.]
    
    The number of drives per shelf limitation is related to power not
    cooling.  (BA35X-HF is required for 7 drives.)
    
    			Bill