Sun Storage 7000 Unified Storage System: Avoid configuring zpools with mixed disk sizes

Asset ID:	1-71-1535372.1
Update Date:	2016-09-30
Keywords:

Solution Type Technical Instruction Sure

Solution 1535372.1 : Sun Storage 7000 Unified Storage System: Avoid configuring zpools with mixed disk sizes

Applies to:

Sun Storage 7310 Unified Storage System - Version All Versions to All Versions [Release All Releases]
Sun Storage 7210 Unified Storage System - Version All Versions to All Versions [Release All Releases]
Sun ZFS Storage 7120 - Version All Versions to All Versions [Release All Releases]
Sun Storage 7410 Unified Storage System - Version All Versions to All Versions [Release All Releases]
Sun ZFS Storage 7420 - Version All Versions to All Versions [Release All Releases]
7000 Appliance OS (Fishworks)

Goal

How can we remove just that one shelf (undo if you will) so that we can re-add it as it's own pool to get the full use of the larger drives?

Solution

The only way to do this is to destroy the pool. You will loose the data on the Pool unless you back it up beforehand. You can then configure two new pools to your specifications.

How many JBODS?

=> From hw (BUI - Maintenance > Hardware) (CLI - maintenance hardware list)

chassis-000 node-name ok Oracle Sun ZFS Storage 7420 node-serial-number --
chassis-001 xxxxFMD00L ok Sun Microsystems, Inc. Sun Disk Shelf (SAS-2) xxxxFMD00L 7200
chassis-002 xxxxFMD00U ok Sun Microsystems, Inc. Sun Disk Shelf (SAS-2) xxxxFMD00U 7200
chassis-003 xxxxFMD03V ok Sun Microsystems, Inc. Sun Disk Shelf (SAS-2) xxxxFMD03V 7200
-bash-4.1$

What raid is being used?

(BUI - Configuration > Storage) (CLI - configuration storage ls - profile = raidz2)

| 7.1) List of zpools available
+------------------------------------------
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
pool-0 136T 55.8T 80.0T 41% 1.00x ONLINE - ================> !! to check the "size"
system 464G 89.7G 374G 19% 1.00x ONLINE -

See also RAID-Z Storage Pool Configuration - http://docs.oracle.com/cd/E23823_01/html/819-5461/gcfof.html#gamtu

=> From zpool 6 vdev x raidz2

pool-0 ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
c6txxxxxxxx213E365Fd0 ONLINE 0 0 0 xxxxFMD00L bay=5
c6txxxxxxxx40B1E89Fd0 ONLINE 0 0 0 xxxxFMD00U bay=4
c6txxxxxxxx40B1F953d0 ONLINE 0 0 0 xxxxFMD00U bay=17
c6txxxxxxxx40B1F807d0 ONLINE 0 0 0 xxxxFMD00L bay=15
c6txxxxxxxx40B7A3C7d0 ONLINE 0 0 0 xxxxFMD00U bay=13
c6txxxxxxxx40B2B95Bd0 ONLINE 0 0 0 xxxxFMD00L bay=4
c6txxxxxxxx40B8A6D3d0 ONLINE 0 0 0 xxxxFMD00U bay=0
c6txxxxxxxx40B2FE57d0 ONLINE 0 0 0 xxxxFMD00L bay=7
c6txxxxxxxx40B8A827d0 ONLINE 0 0 0 xxxxFMD00U bay=5
c6txxxxxxxx40B7ADF7d0 ONLINE 0 0 0 xxxxFMD00L bay=16
c6txxxxxxxx40B8AB9Bd0 ONLINE 0 0 0 xxxxFMD00U bay=16
c6txxxxxxxx40B7E973d0 ONLINE 0 0 0 xxxxFMD00L bay=8
c6txxxxxxxx40B8B49Fd0 ONLINE 0 0 0 xxxxFMD00U bay=22
c6txxxxxxxx40B7E997d0 ONLINE 0 0 0 xxxxFMD00L bay=19
raidz2-1 ONLINE 0 0 0
c6txxxxxxxx40B8B837d0 ONLINE 0 0 0 xxxxFMD00U bay=21
c6txxxxxxxx40B7F11Fd0 ONLINE 0 0 0 xxxxFMD00L bay=17
c6txxxxxxxx40B8BDB3d0 ONLINE 0 0 0 xxxxFMD00U bay=19
c6txxxxxxxx40B8AE07d0 ONLINE 0 0 0 xxxxFMD00L bay=0
c6txxxxxxxx40B8C0F7d0 ONLINE 0 0 0 xxxxFMD00U bay=1
c6txxxxxxxx40B8CFDFd0 ONLINE 0 0 0 xxxxFMD00L bay=2
c6txxxxxxxx40B8D12Bd0 ONLINE 0 0 0 xxxxFMD00U bay=23
c6txxxxxxxx40B8D1F3d0 ONLINE 0 0 0 xxxxFMD00L bay=10
c6txxxxxxxx40B30CD3d0 ONLINE 0 0 0 xxxxFMD00U bay=20
c6txxxxxxxx40B31BF7d0 ONLINE 0 0 0 xxxxFMD00L bay=14
c6txxxxxxxx40B30D63d0 ONLINE 0 0 0 xxxxFMD00U bay=14
c6txxxxxxxx40B95B8Bd0 ONLINE 0 0 0 xxxxFMD00L bay=11
c6txxxxxxxx40B30E93d0 ONLINE 0 0 0 xxxxFMD00U bay=9
c6txxxxxxxx40B921A3d0 ONLINE 0 0 0 xxxxFMD00L bay=13
raidz2-2 ONLINE 0 0 0
c6txxxxxxxx40B31EF3d0 ONLINE 0 0 0 xxxxFMD00U bay=12
c6txxxxxxxx40B955F7d0 ONLINE 0 0 0 xxxxFMD00L bay=1
c6txxxxxxxx40B90C5Bd0 ONLINE 0 0 0 xxxxFMD00U bay=11
c6txxxxxxxx40B8337Bd0 ONLINE 0 0 0 xxxxFMD00L bay=9
c6txxxxxxxx40B91FA3d0 ONLINE 0 0 0 xxxxFMD00U bay=2
c6txxxxxxxx40B9182Bd0 ONLINE 0 0 0 xxxxFMD00L bay=6
c6txxxxxxxx40B96D37d0 ONLINE 0 0 0 xxxxFMD00U bay=3
c6txxxxxxxx40B9616Fd0 ONLINE 0 0 0 xxxxFMD00L bay=3
c6txxxxxxxx40B309D3d0 ONLINE 0 0 0 xxxxFMD00U bay=10
c6txxxxxxxx40B83227d0 ONLINE 0 0 0 xxxxFMD00L bay=12
c6txxxxxxxx40B891BFd0 ONLINE 0 0 0 xxxxFMD00U bay=8
c6txxxxxxxx40B92517d0 ONLINE 0 0 0 xxxxFMD00L bay=18
c6txxxxxxxx40B910F7d0 ONLINE 0 0 0 xxxxFMD00U bay=7
c6txxxxxxxx40B924AFd0 ONLINE 0 0 0 xxxxFMD00U bay=15
raidz2-5 ONLINE 0 0 0
c6txxxxxxxxxE4B2998d0 ONLINE 0 0 0 xxxxFMD03V bay=10
c6txxxxxxxxxE4E5A10d0 ONLINE 0 0 0 xxxxFMD03V bay=14
c6txxxxxxxxxE4E9AC8d0 ONLINE 0 0 0 xxxxFMD03V bay=19
c6txxxxxxxxxE4E9068d0 ONLINE 0 0 0 xxxxFMD03V bay=7
c6txxxxxxxxxE4EBB1Cd0 ONLINE 0 0 0 xxxxFMD03V bay=13
c6txxxxxxxxxE4EBFACd0 ONLINE 0 0 0 xxxxFMD03V bay=5
c6txxxxxxxxxE4ED1E8d0 ONLINE 0 0 0 xxxxFMD03V bay=11
c6txxxxxxxxxE4EEE50d0 ONLINE 0 0 0 xxxxFMD03V bay=22
c6txxxxxxxxxE4EF1E8d0 ONLINE 0 0 0 xxxxFMD03V bay=23
c6txxxxxxxxxE4EF1FCd0 ONLINE 0 0 0 xxxxFMD03V bay=21
c6txxxxxxxxxE4EF178d0 ONLINE 0 0 0 xxxxFMD03V bay=17
raidz2-6 ONLINE 0 0 0
c6txxxxxxxxxE4F1E64d0 ONLINE 0 0 0 xxxxFMD03V bay=6
c6txxxxxxxxxE4FC1CCd0 ONLINE 0 0 0 xxxxFMD03V bay=12
c6txxxxxxxxxE4FCF24d0 ONLINE 0 0 0 xxxxFMD03V bay=15
c6txxxxxxxxxE45C618d0 ONLINE 0 0 0 xxxxFMD03V bay=0
c6txxxxxxxxxE444CA4d0 ONLINE 0 0 0 xxxxFMD03V bay=2
c6txxxxxxxxxE501C7Cd0 ONLINE 0 0 0 xxxxFMD03V bay=9
c6txxxxxxxxxE502F7Cd0 ONLINE 0 0 0 xxxxFMD03V bay=1
c6txxxxxxxxxE3682E0d0 ONLINE 0 0 0 xxxxFMD03V bay=8
c6txxxxxxxxxE5030D0d0 ONLINE 0 0 0 xxxxFMD03V bay=4
c6txxxxxxxxxE50362Cd0 ONLINE 0 0 0 xxxxFMD03V bay=16
c6txxxxxxxxxE492680d0 ONLINE 0 0 0 xxxxFMD03V bay=3
logs
c6txxxxxxxx30023D67d0 ONLINE 0 0 0 xxxxFMD00L bay=21
c6txxxxxxxx30037D66d0 ONLINE 0 0 0 xxxxFMD00L bay=20
cache
c1t2d0 ONLINE 0 0 0node-serial-numberbay=2
c1t3d0 ONLINE 0 0 0node-serial-numberbay=3
spares
c6txxxxxxxx40B968DFd0 AVAIL xxxxFMD00U bay=6
c6txxxxxxxx40B9228Fd0 AVAIL xxxxFMD00U bay=18
c6txxxxxxxxxE500530d0 AVAIL xxxxFMD03V bay=20
c6txxxxxxxxxE503748d0 AVAIL xxxxFMD03V bay=18

What is the size of the disk in the pool?

=> To check the "size" (BUI - Maintenance > Hardware) (CLI - maintenance hardware list)

a) From hw, they can see the details of the disks and JBOD:

chassis-001 xxxxFMD00L ok Sun Microsystems, Inc. Sun Disk Shelf (SAS-2) xxxxFMD00L 7200

disk-000 HDD 0 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0NZ8 9WM80NZ8 7200
disk-001 HDD 1 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx1HKV 9WM81HKV 7200
disk-002 HDD 2 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0PTV 9WM80PTV 7200
disk-003 HDD 3 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx1HVX 9WM81HVX 7200
disk-004 HDD 4 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx03ML 9WM803ML 7200
disk-005 HDD 5 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxGJXS 9WM1GJXS 7200
disk-006 HDD 6 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0LVM 9WM80LVM 7200
disk-007 HDD 7 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZL1E 9WM7ZL1E 7200
disk-008 HDD 8 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0G6P 9WM80G6P 7200
disk-009 HDD 9 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx09QJ 9WM809QJ 7200
disk-010 HDD 10 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0KVM 9WM80KVM 7200
disk-011 HDD 11 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx1HNB 9WM81HNB 7200
disk-012 HDD 12 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx09PH 9WM809PH 7200
disk-013 HDD 13 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0MJ7 9WM80MJ7 7200
disk-014 HDD 14 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZFJ3 9WM7ZFJ3 7200
disk-015 HDD 15 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZYQT 9WM7ZYQT 7200
disk-016 HDD 16 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx13F4 9WM813F4 7200
disk-017 HDD 17 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0GEJ 9WM80GEJ 7200
disk-018 HDD 18 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0MKP 9WM80MKP 7200
disk-019 HDD 19 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0G7V 9WM80G7V 7200
disk-020 HDD 20 ok STEC ZeusIOPs xxxxxxx2CA3E --
disk-021 HDD 21 ok STEC ZeusIOPs xxxxxxx163C7 --
disk-022 HDD 22 absent - - - --
disk-023 HDD 23 absent - - - --
fan-000 FAN 0/0 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0148
fan-001 FAN 0/1 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0148
fan-002 FAN 1/0 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0147
fan-003 FAN 1/1 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0147
psu-000 PSU 0 ok Sun Microsystems, Inc. 3002276 xxxxxxx-xxxxxL0148
psu-001 PSU 1 ok Sun Microsystems, Inc. 3002276 xxxxxxx-xxxxxL0147
slot-000 SIM 0 ok Sun Microsystems, Inc. 3753633 xxxxxxx-xxxxxC102C
slot-001 SIM 1 ok Sun Microsystems, Inc. 3753633 xxxxxxx-xxxxxC109B

chassis-002 xxxxFMD00U ok Sun Microsystems, Inc. Sun Disk Shelf (SAS-2) xxxxFMD00U 7200

disk-000 HDD 0 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0NPL 9WM80NPL 7200 =====> ST32000SSSUN2.0T ==> 2.0T
disk-001 HDD 1 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0PRT 9WM80PRT 7200
disk-002 HDD 2 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0MG0 9WM80MG0 7200
disk-003 HDD 3 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx1N6A 9WM81N6A 7200
disk-004 HDD 4 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZYB7 9WM7ZYB7 7200
disk-005 HDD 5 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0NRN 9WM80NRN 7200
disk-006 HDD 6 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxXNCQ 9WM7XNCQ 7200
disk-007 HDD 7 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0LYV 9WM80LYV 7200
disk-008 HDD 8 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0878 9WM80878 7200
disk-009 HDD 9 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZFTH 9WM7ZFTH 7200
disk-010 HDD 10 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZFQ1 9WM7ZFQ1 7200
disk-011 HDD 11 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0LLY 9WM80LLY 7200
disk-012 HDD 12 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZKZQ 9WM7ZKZQ 7200
disk-013 HDD 13 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0CEY 9WM80CEY 7200
disk-014 HDD 14 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZFNR 9WM7ZFNR 7200
disk-015 HDD 15 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0MMM 9WM80MMM 7200
disk-016 HDD 16 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0NSQ 9WM80NSQ 7200
disk-017 HDD 17 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZYS7 9WM7ZYS7 7200
disk-018 HDD 18 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0MKC 9WM80MKC 7200
disk-019 HDD 19 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0PLA 9WM80PLA 7200
disk-020 HDD 20 ok SEAGATE ST32000SSSUN2.0T xxxxxxxxZFSP 9WM7ZFSP 7200
disk-021 HDD 21 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0PBN 9WM80PBN 7200
disk-022 HDD 22 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0P6Z 9WM80P6Z 7200
disk-023 HDD 23 ok SEAGATE ST32000SSSUN2.0T xxxxxxxx0KTZ 9WM80KTZ 7200
fan-000 FAN 0/0 ok Sun Microsystems, Inc. - xxxxxxx-xxxxXL0335
fan-001 FAN 0/1 ok Sun Microsystems, Inc. - xxxxxxx-xxxxXL0335
fan-002 FAN 1/0 ok Sun Microsystems, Inc. - xxxxxxx-xxxxXL0141
fan-003 FAN 1/1 ok Sun Microsystems, Inc. - xxxxxxx-xxxxXL0141
psu-000 PSU 0 ok Sun Microsystems, Inc. 3002276 xxxxxxx-xxxxXL0335
psu-001 PSU 1 ok Sun Microsystems, Inc. 3002276 xxxxxxx-xxxxXL0141
slot-000 SIM 0 ok Sun Microsystems, Inc. 3753633 xxxxxxx-xxxxQC1109
slot-001 SIM 1 ok Sun Microsystems, Inc. 3753633 xxxxxxx-xxxxQC1008

chassis-003 xxxxFMD03V ok Sun Microsystems, Inc. Sun Disk Shelf (SAS-2) xxxxFMD03V 7200

disk-000 HDD 0 ok HITACHI H7230AS60SUN3.0T xxxxxxx7BKLD YVH7BKLD 7200 ========> Notice H7230AS60SUN3.0T ==> 3.0T
disk-001 HDD 1 ok HITACHI H7230AS60SUN3.0T xxxxxxxE32AD YVHE32AD 7200
disk-002 HDD 2 ok HITACHI H7230AS60SUN3.0T xxxxxxx6KEAD YVH6KEAD 7200
disk-003 HDD 3 ok HITACHI H7230AS60SUN3.0T xxxxxxx9745K YVH9745K 7200
disk-004 HDD 4 ok HITACHI H7230AS60SUN3.0T xxxxxxxE352D YVHE352D 7200
disk-005 HDD 5 ok HITACHI H7230AS60SUN3.0T xxxxxxxD9KZD YVHD9KZD 7200
disk-006 HDD 6 ok HITACHI H7230AS60SUN3.0T xxxxxxxDHWJD YVHDHWJD 7200
disk-007 HDD 7 ok HITACHI H7230AS60SUN3.0T xxxxxxxD6EDD YVHD6EDD 7200
disk-008 HDD 8 ok HITACHI H7230AS60SUN3.0T xxxxxxxYZB2K YVGYZB2K 7200
disk-009 HDD 9 ok HITACHI H7230AS60SUN3.0T xxxxxxxE1U3D YVHE1U3D 7200
disk-010 HDD 10 ok HITACHI H7230AS60SUN3.0T xxxxxxxAAELD YVHAAELD 7200
disk-011 HDD 11 ok HITACHI H7230AS60SUN3.0T xxxxxxxDATMD YVHDATMD 7200
disk-012 HDD 12 ok HITACHI H7230AS60SUN3.0T xxxxxxxDVSWD YVHDVSWD 7200
disk-013 HDD 13 ok HITACHI H7230AS60SUN3.0T xxxxxxxD98KD YVHD98KD 7200
disk-014 HDD 14 ok HITACHI H7230AS60SUN3.0T xxxxxxxD2U6D YVHD2U6D 7200
disk-015 HDD 15 ok HITACHI H7230AS60SUN3.0T xxxxxxxDWNED YVHDWNED 7200
disk-016 HDD 16 ok HITACHI H7230AS60SUN3.0T xxxxxxxE3J4D YVHE3J4D 7200
disk-017 HDD 17 ok HITACHI H7230AS60SUN3.0T xxxxxxxDDWTD YVHDDWTD 7200
disk-018 HDD 18 ok HITACHI H7230AS60SUN3.0T xxxxxxxE3LED YVHE3LED 7200
disk-019 HDD 19 ok HITACHI H7230AS60SUN3.0T xxxxxxxD73UD YVHD73UD 7200
disk-020 HDD 20 ok HITACHI H7230AS60SUN3.0T xxxxxxxE080D YVHE080D 7200
disk-021 HDD 21 ok HITACHI H7230AS60SUN3.0T xxxxxxxDDXVD YVHDDXVD 7200
disk-022 HDD 22 ok HITACHI H7230AS60SUN3.0T xxxxxxxDDP8D YVHDDP8D 7200
disk-023 HDD 23 ok HITACHI H7230AS60SUN3.0T xxxxxxxDDXPD YVHDDXPD 7200
fan-000 FAN 0/0 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0594
fan-001 FAN 0/1 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0594
fan-002 FAN 1/0 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0586
fan-003 FAN 1/1 ok Sun Microsystems, Inc. - xxxxxxx-xxxxxL0586
psu-000 PSU 0 ok Sun Microsystems, Inc. 3002276 xxxxxxx-xxxxxL0594
psu-001 PSU 1 ok Sun Microsystems, Inc. 3002276 xxxxxxx-xxxxxL0586
slot-000 SIM 0 ok Sun Microsystems, Inc. 3753633 xxxxxxx-xxxxxC1198
slot-001 SIM 1 ok Sun Microsystems, Inc. 3753633 xxxxxxx-xxxxxC131F

How much space we should see from adding a shelf of 3TB drives (vs 2TB) ? ... it depends on layout set up when data pool is created, mirror, raidz, etc ..

In general we can check with command " zpool list" and example here:

How many pools configured?

Sun ZFS Storage 7000 System Administration Guide
http://docs.oracle.com/cd/E26765_01/html/E26397/configuration__storage.html

Configuration Rules and Guidelines For optimal performance, keep in mind the following:

Rule 1 -- All "data" disks contained within a head node or JBOD must have the same rotational speed (media rotation rate RPM's 7200, 10K or 15K).
The ZFSSA software will detect misconfigurations and generate a fault for the condition.

Recommendation 1 -- Due to unpredictable performance issues, avoid mixing different disk rotational speeds within the same pool.

Recommendation 2 -- For optimal performance, do not combine JBODs with different disk rotational speeds on the same SAS fabric (HBA connection).
Such a mixture operates correctly, but likely results in slower performance of the faster devices.

Recommendation 3 -- When configuring storage pools that contain data disks of different capacities (size: 500GB, 600GB, 1TB, 2TB, 3TB),
ZFS will in some cases will be limited to that of the smallest capacity disk for some or all of the disks within the storage pool,
thereby reducing the overall expected capacity.
The sizes used will depend on the storage profile, layout, and combination of devices.

Avoid mixing different disk capacities within the same pool.

Note: If expanding an EXISTING pool, the capacity of the drives will be maintained. The usable capacity (of a mixed pool) will be the sum of the corresponding vdev sizes, each vdev composed of same size drives only.

References

https://mediawiki.us.oracle.com/systemsfaq/index.php/Oracle_ZFS_Storage_Appliance_Storage_Media

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