Re: [smartmontools-support] FW: [hpsa] regular freezes with smartctl -d cciss, 0

[Wolford, J. (HP S. - W. S. performance) <jef...@hp...>]

Justin,

Smartmon uses the ATA PASS-THROUGH and that lives in the "wild west" where MULTIPLE things are not defined:
1) Interaction between normal SAT (SCSI to ATA Translated ) commands and ATA PASS-THROUGH is PURPOSELY not defined... 
	Example: reading / writing on one path does not have cache coherency / order with using the other path
2) MULTIPLE ATA PASS-THROUGH commands are NOT ordered or blocking
	With Multiple ATA PASS-THROUGH commands, one command can interrupt / corrupted another
	ATA PASS-THROUGH commands could get re-ordered

NET: one at time

Jeff

Jeff Wolford

| -----Original Message-----
| From: Justin Pryzby [mailto:pr...@te...]
| Sent: Thursday, February 12, 2015 12:12 PM
| To: Scott Benesh; sma...@li...
| Cc: dl Team ESD Storage Dev Support; ISS StorageDev
| Subject: Re: [smartmontools-support] FW: [hpsa] regular freezes with smartctl -d
| cciss, 0
| 
| hpacucli
| => ctrl slot=3 show config
| 
| Smart Array P410 in Slot 3                (sn: PACCRID12320GXS)
| 
|    array A (SATA, Unused Space: 0  MB)
| 
| 
|       logicaldrive 1 (149.0 GB, RAID 1, OK)
| 
|       physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SATA, 160 GB, OK)
|       physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SATA, 160 GB, OK)
|       physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SATA, 160 GB, OK, spare)
| 
|    array B (SATA, Unused Space: 0  MB)
| 
| 
|       logicaldrive 2 (3.6 TB, RAID 5, OK)
| 
|       physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SATA, 1 TB, OK)
|       physicaldrive 1I:1:5 (port 1I:box 1:bay 5, SATA, 1 TB, OK)
|       physicaldrive 1I:1:6 (port 1I:box 1:bay 6, SATA, 1 TB, OK)
|       physicaldrive 1I:1:7 (port 1I:box 1:bay 7, SATA, 1 TB, OK)
|       physicaldrive 1I:1:8 (port 1I:box 1:bay 8, SATA, 1 TB, OK)
|       physicaldrive 1I:1:9 (port 1I:box 1:bay 9, SATA, 1 TB, OK, spare)
| 
|    Enclosure SEP (Vendor ID HP, Model DL18xG6BP) 248 (WWID:
| 5001438021435853, Port: 1I, Box: 1)
| 
|    Expander 250 (WWID: 5001438021435840, Port: 1I, Box: 1)
| 
|    SEP (Vendor ID PMCSIERA, Model  SRC 8x6G) 249 (WWID:
| 500143802296AE6F)
| 
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