sasmgr output

[Abhzi]

Hello Experts,

Can some one please explain the below output of raid from SAS? All I know is,  disk_15 is primary root disk which is Hardware mirrored(RAID 1) as it says. But as you can see in output there are 5 persistant paths (disk15, disk16, disk17, disk18, disk 19). What is mirrored to what? Which is primary? And what is logic drive? In, actual how many drives are being utilized? (pheeww...) I appreciate if someone can help.

bash-4.2# sasmgr get_info -N -D /dev/sasd2 -q raid

Wed Apr 24 14:23:29 2013

---------- PHYSICAL DRIVES ---------- LUN dsf              SAS Address          Enclosure    Bay      Size(MB)

/dev/rdisk/disk17    0x5000c5000f69e0a5     1            6      140014 /dev/rdisk/disk18    0x5000c5000f6c7a75     1            7      140014 /dev/rdisk/disk19    0x5000c5000f6cb6fd     1            8      140014

---------- LOGICAL DRIVE 1 ----------

Raid Level                                         : RAID 1 Volume sas address                                 : 0x79a3b2e00adf50e Device Special File                                : /dev/rdisk/disk16 Raid State                                         : OPTIMAL Raid Status Flag                                   : ENABLED Raid Size                                          : 139236 Rebuild Rate                                       : 0.00 % Rebuild Progress                                   : 100.00 %

Participating Physical Drive(s) :

SAS Address         Enc   Bay   Size(MB)      Type            State

0x5000c5000f6c7cc9   1     5    140014        SECONDARY       ONLINE 0x5000c5001dc95371   1     4    140014        PRIMARY         ONLINE

---------- LOGICAL DRIVE 3 ----------

Raid Level                                         : RAID 1 Volume sas address                                 : 0x53a4a63324d955b Device Special File                                : /dev/rdisk/disk15 Raid State                                         : OPTIMAL Raid Status Flag                                   : ENABLED Raid Size                                          : 139236 Rebuild Rate                                       : 0.00 % Rebuild Progress                                   : 100.00 %

Participating Physical Drive(s) :

SAS Address         Enc   Bay   Size(MB)      Type            State

0x5000c5001dc91a79   1     2    140014        SECONDARY       ONLINE 0x5000c5001dc9122d   1     1    140014        PRIMARY         ONLINE

---------- GLOBAL SPARE DRIVES ---------- SAS Address               Enc   Bay   Size(MB)        Pool       State

0x5000c5001dc71705        1     3     140014          0          ACTIVE

Thanks in advance.

[Torsten.]

Could you please post better formatted text???

And please post an

# ioscan -fn

# ioscan -fnN

# ioscan -m dsf

too!

[Patrick Wallek · Accepted solution]

A logical drive is basically what HP-UX sees when you set up a RAID set in your RAID card.

You have 2 l ogical drives configured via your RAID card.

You have Logical drive 1, which is seen in HP-UX as /dev/rdisk/disk16.  This logical drive is comprised of 2 actual drives, located in bays 4 & 5, and is a RAID 1 set.

You also have logical drive 3, which is seen in HP-UX as /dev/rdisk/disk15.  This logical drive is comprised of 2 actual drives, located in bays 1 & 2, and is a RAID 1 set.

There are also 3 drives that are not part of a RAID set.  These physical drives are /dev/rdisk/disk17, disk18 and disk19.  There is no redundency from the RAID card itself for these drives.

You also have 1 more drive, in bay 3, that is a hot spare.  This can be used if any drive in a RAID set fails.

[Abhzi]

I apologize Torston for that odd output, I should have checked preview before updating.

Thanks Patrick!  I was thinking that only under LVM HPUX understands Logical concepts. I was not aware that it is now at controller level as well.

Can I remove the raid or build the raild online on the drives that are not in use? Or Can I use it even without raid.  I am looking for a suitable drive for a DRD clone. Can I create it on any of the disks 17,18 or 19 which has no redundncy?

[Torsten.]

You are using the integrated LSI SAS chip. This controller can manage 2 mirrored pairs and a hot spare. The remaining disks are just disks without any hardware raid. So you can use them for DRD.