topic Re: sasmgr output in Operating System - HP-UX

sasmgr output

Abhzi — Wed, 24 Apr 2013 10:33:11 GMT

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.

Re: sasmgr output

Torsten. — Wed, 24 Apr 2013 13:37:33 GMT

Could you please post better formatted text???

And please post an

# ioscan -fn

# ioscan -fnN

# ioscan -m dsf

too!

Re: sasmgr output

Patrick Wallek — Wed, 24 Apr 2013 14:00:50 GMT

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.

Re: sasmgr output

Abhzi — Thu, 25 Apr 2013 09:19:57 GMT

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?

Re: sasmgr output

Torsten. — Thu, 25 Apr 2013 10:21:58 GMT

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.