What is AUTORAID in VA doing?

[William Wan_1]

spec: VA7400 using AUTORAID with 71 disks with HP19 and using SDM 1.0.7

Hi,

I got two questions about AUTORAID using in Virtual Array.

1. Using armdsp I see a change in the Total Physical Size of one of a RedundancyGroup has been grown in last 2 months.
Is this because the array is using more RADI 5 DP in stead of RAID 1+0 because of lack of storge and therefore more storage space has become available??

CAPACITY USAGE (2 months ago)

Total Disk Enclosures:________________5

Redundancy Group:_____________________1
Total Disks:________________________36
Total Physical Size:________________717.639 GB
Allocated to Regular LUNs:__________248 GB
Allocated as Business Copies:_______100 GB
Used as Active Hot Spare:___________66.75 GB
Used for Redundancy:________________117.421 GB
Unallocated (Available for LUNs):___185.468 GB

Redundancy Group:_____________________2
Total Disks:________________________34
Total Physical Size:________________684.261 GB
Allocated to Regular LUNs:__________219 GB
Allocated as Business Copies:_______20 GB
Used as Active Hot Spare:___________66.75 GB
Used for Redundancy:________________114.382 GB
Unallocated (Available for LUNs):___264.128 GB


CAPACITY USAGE (2 months later without add or replace a disk)

Total Disk Enclosures:________________5

Redundancy Group:_____________________1
Total Disks:________________________36
Total Physical Size:________________717.639 GB
Allocated to Regular LUNs:__________288 GB
Allocated as Business Copies:_______100 GB
Used as Active Hot Spare:___________66.75 GB
Used for Redundancy:________________117.421 GB
Unallocated (Available for LUNs):___145.468 GB

Redundancy Group:_____________________2
Total Disks:________________________35
Total Physical Size:________________700.95 GB
Allocated to Regular LUNs:__________333 GB
Allocated as Business Copies:_______20 GB
Used as Active Hot Spare:___________66.75 GB
Used for Redundancy:________________115.903 GB
Unallocated (Available for LUNs):___165.296 GB

2. using armperf -c ARRAY -m "RAID 1+0 Allocation,RAID 5 DP Allocation" VA7400, I expected to see the numbers of logical blocks in RAID1+0 and RAID5DP. But armperf put the results in GB and in a very small number. See below.

Is this a precentage of a numbers of logical blocks in total? or is it numbers of logical blocks in Giga so that i need to multipli 0.015 x 1073741824 (1G) = 16106127.36 => numbers of logical blocks in entire ARRAY?
But that doesn't make sence. If i run armperf to a specific LUN, I will get a bigger number than the one from entire Array.
All I want to know is, how much of the disks are in RAID1+0 and in RAID5DP. How can I see it?
PS: I attached an outout of armdsp in txt

Thanks in advance

William


#armperf -c ARRAY -m "RAID 1+0 Allocation,RAID 5 DP Allocation" VA7400
Start Wed Oct 20 23:37:07 CEST 2004
Finish Thu Nov 18 15:40:08 CET 2004
Array ID: HPA6189A00SG213J0100
Alias Name: VA7400
ARRAY
RAID 1+0 RAID 5 DP
Allocation Allocation



(GB) (GB)

10/20/2004 23:37:45 0.015 0.416
10/20/2004 23:52:45 0.015 0.416
10/21/2004 00:07:45 0.015 0.416
10/21/2004 00:22:45 0.015 0.415



#armperf -c LUN -u 23 -m "RAID 1+0 Allocation,RAID 5 DP Allocation" VA7400
Start Wed Oct 20 23:37:07 CEST 2004
Finish Thu Nov 18 15:55:08 CET 2004
Array ID: HPA6189A00SG213J0100
Alias Name: VA7400
LUN 23
RAID 1+0 RAID 5 DP
Allocation Allocation



(GB) (GB)

10/24/2004 19:52:55 0.454 26.266
10/24/2004 20:07:55 0.582 26.138
10/24/2004 20:22:55 0.582 26.138
10/24/2004 20:37:55 0.582 26.138
10/24/2004 20:52:55 0.582 26.138
10/24/2004 21:07:55 0.582 26.138
10/24/2004 21:22:55 0.582 26.138
10/24/2004 21:37:55 0.582 26.138
10/24/2004 21:52:55 0.423 26.297
10/24/2004 22:07:55 0.184 26.536
10/24/2004 22:22:55 0.184 26.536
10/24/2004 22:37:55 0.17 26.55
10/24/2004 22:52:55 0.168 26.552
10/24/2004 23:07:56 0.168 26.552
10/24/2004 23:22:56 0.158 26.562
10/24/2004 23:37:56 0.158 26.562
10/24/2004 23:52:56 0.158 26.562
10/25/2004 00:07:56 0.152 26.568
10/25/2004 00:22:56 0.152 26.568
10/25/2004 00:37:56 0.146 26.574
10/25/2004 00:52:56 0.146 26.574
10/25/2004 01:07:56 0.146 26.574
10/25/2004 01:22:56 0.146 26.574
10/25/2004 01:37:56 0.146 26.574
10/25/2004 01:52:56 0.146 26.574
10/25/2004 02:07:56 0.146 26.574
10/25/2004 02:22:56 0.146 26.574
10/25/2004 02:37:56 0.146 26.574

[Bernhard Mueller]

William,

1. look at the armdsp. you have added a disk in RG2.

2. cannot help with armperf.

Regards,
Bernhard

[William Wan_1]

I've no idea how and when was a disk added? need to find it out myself later.

But question remains is
If an ARRYA in AUTORAID is changing config from RAID0+1 to RAID 5DP and visa vesa, will it affect the total unallocated storage shown by armdsp??

[Bill Costigan]

I've never seen the numbers change as far as available disk is concerned.

I assume the va (when running in autoraid) calculates the available sizes based on its rules for raid 0+1 vs raid 5 (I think its something like 10% or 20% raid 0+1). i.e. what the maximum space available using the lowest amount of raid 0+1 allowed.

Then it keeps as much in raid 0+1 as it can until it needs the space.

[Simon White]

William,

The Unallocated space on RG1 has decreased from 185GB to 145GB because someone has created a 40GB LUN (if you you look at your allocated space for LUNS this has increased from 248GB to 288GB). I don't think this has anything to do with AUTORAID.

Regards
Simon