topic Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000 in ONTAP Discussions

FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 03:18:20 GMT

Case description:

FAS2520 / Data ONTAP 7-Mode: aggr0 double degraded, replacement drives detected as SAS 15000 and not accepted as matching spares, maintenance disk stuck in testing.

Current problem

aggr0 is currently double degraded.
The RAID group shows two FAILED data members.
We have available spare disks, but the system is not using them for rebuild.
A maintenance disk (0a.00.3) remains in testing status.

Observed behavior

From aggr status -r:

Aggregate aggr0 (online, raid_dp, degraded) (block checksums)
RAID group /aggr0/plex0/rg0 (double degraded, block checksums)
Two data positions in the RAID group show as FAILED

From aggr status -s:

Current spare disks are:
- 0a.00.1 → SAS 15000
- 0a.00.8 → SAS 15000 (at one point shown as not zeroed)

From aggr status -r:

Existing RAID group members are shown as FSAS 7200
Maintenance disks section shows:
- 0a.00.3 → testing, FSAS 7200

From disk show -v:

0a.00.3 shows OWNER = FAILED

Drive identification inconsistency

From storage show disk -T -x:

0a.00.1 and 0a.00.8 are identified as:
- Model = X477_SMBPE04TA07
- Rev = NA00
- Type = SAS
Most other data disks in the shelf are identified as:
- Model = X477_SMEGX04TA07
- Rev = NA03
- Type = FSAS

We also replaced the disk in slot 0a.00.8 with another brand-new replacement drive, but the newly inserted disk was still detected as SAS / RPM 15000.

What we already checked

raid.disktype.enable = off
raid.rpm.ata.enable = off
Broken disks (empty) from aggr status -f
Current spare disks are owned by the controller and use block checksum
Another new replacement drive inserted into 0a.00.8 still shows as SAS 15000

Our concern

It appears that the available replacement drives are not being accepted as valid matching spares for aggr0, possibly because the RAID group members are shown as FSAS 7200 while the replacement drives are detected as SAS 15000.

We need help with

Please confirm whether the replacement drives/FRUs are correct for this platform and RAID group.
Please confirm whether there is a disk qualification / drive firmware / recognition issue causing the system to identify replacement drives as SAS instead of FSAS.
Please advise the supported recovery procedure for aggr0 in the current double degraded state.
Please advise how to handle maintenance disk 0a.00.3, which remains in testing and also appears as OWNER = FAILED.

Commands / outputs available

We can provide the outputs of:

aggr status -r
aggr status -s
aggr status -f
storage show disk -T -x
storage show disk -x
sysconfig -d
disk show -v
options raid.disktype.enable
options raid.rpm.ata.enable

Please advise next steps.

Best regards

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 04:53:21 GMT

One additional question: disk 0a.00.0 and disk 0a.00.1 appear very similar in the visible outputs (same vendor/model family and revision), but ONTAP identifies 0a.00.0 as FSAS/7200 in RAID view while 0a.00.1 is identified as SAS/15000 spare. Please help confirm whether this is due to DQP/drive qualification/firmware recognition or another disk-type mapping issue.

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 04:57:26 GMT

Update System information:

- Storage system name: sn7047064-stor

- Model: FAS2520

- Data ONTAP version: 8.2.4 7-Mode

- System ID: 0537073381

- Management IP: 10.67.47.92

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 04:58:06 GMT

sn7047064-stor*> sysconfig -d

Device HA SHELF BAY CHAN Disk Vital Product Information

---------- -- ----- --- ---- ------------------------------

0a.00.0 0a 0 0 SA:A ZC12C9EB

0a.00.1 0a 0 1 SA:A ZC12SJ8R

0a.00.2 0a 0 2 SA:A Z1ZBWY1P

0a.00.3 0a 0 3 SA:A Not available.

0a.00.4 0a 0 4 SA:A Z1ZBWYYP

0a.00.5 0a 0 5 SA:A Z1ZBWZX1

0a.00.6 0a 0 6 SA:A Z1ZBWXZG

0a.00.7 0a 0 7 SA:A Z1ZBWZFN

0a.00.8 0a 0 8 SA:A ZC12SH5E

0a.00.9 0a 0 9 SA:A Z1ZBWZYZ

0a.00.10 0a 0 10 SA:A Z1ZBWXWD

0a.00.11 0a 0 11 SA:A Z1ZBWQ3W

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 04:58:23 GMT

sn7047064-stor*> storage show disk -T -x

DISK SHELF BAY SERIAL VENDOR MODEL REV TYPE

-------- ----- --- -------- ------ ---------------- --- -----

0a.00.1 0 1 ZC12SJ8R NETAPP X477_SMBPE04TA07 NA00 SAS

0a.00.8 0 8 ZC12SH5E NETAPP X477_SMBPE04TA07 NA00 SAS

0a.00.0 0 0 ZC12C9EB NETAPP X477_SMBPE04TA07 NA00 FSAS

0a.00.2 0 2 Z1ZBWY1P NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.3 0 3 Z1ZBWS35 NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.4 0 4 Z1ZBWYYP NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.5 0 5 Z1ZBWZX1 NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.6 0 6 Z1ZBWXZG NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.7 0 7 Z1ZBWZFN NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.9 0 9 Z1ZBWZYZ NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.10 0 10 Z1ZBWXWD NETAPP X477_SMEGX04TA07 NA03 FSAS

0a.00.11 0 11 Z1ZBWQ3W NETAPP X477_SMEGX04TA07 NA03 FSAS

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 04:59:07 GMT

sn7047064-stor*> aggr status -f

Broken disks (empty)

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 04:59:19 GMT

sn7047064-stor*> disk show -v

DISK OWNER POOL SERIAL NUMBER HOME DR HOME CHKSUM

-------- ---------------------------- ----- ------------- ---------------------------- ------- ------

0a.00.8 sn7047064-stor(537073381) Pool0 ZC12SH5E sn7047064-stor(537073381) Block

0a.00.0 sn7047064-stor(537073381) Pool0 ZC12C9EB sn7047064-stor(537073381) Block

0a.00.10 sn7047064-stor(537073381) Pool0 Z1ZBWXWD sn7047064-stor(537073381) Block

0a.00.4 sn7047064-stor(537073381) Pool0 Z1ZBWYYP sn7047064-stor(537073381) Block

0a.00.7 sn7047064-stor(537073381) Pool0 Z1ZBWZFN sn7047064-stor(537073381) Block

0a.00.6 sn7047064-stor(537073381) Pool0 Z1ZBWXZG sn7047064-stor(537073381) Block

0a.00.2 sn7047064-stor(537073381) Pool0 Z1ZBWY1P sn7047064-stor(537073381) Block

0a.00.11 sn7047064-stor(537073381) Pool0 Z1ZBWQ3W sn7047064-stor(537073381) Block

0a.00.5 sn7047064-stor(537073381) Pool0 Z1ZBWZX1 sn7047064-stor(537073381) Block

0a.00.9 sn7047064-stor(537073381) Pool0 Z1ZBWZYZ sn7047064-stor(537073381) Block

0a.00.3 FAILED ----- Z1ZBWS35 sn7047064-stor(537073381) Block

0a.00.1 sn7047064-stor(537073381) Pool0 ZC12SJ8R sn7047064-stor(537073381) Block

Re: FAS2520 aggr0 double degraded, replacement drives detected as SAS 15000

Zeam — Tue, 19 May 2026 05:05:26 GMT

In OnCommand System Manager, I right-clicked spare disk 0a.00.1 and selected "Add to Aggregate".

A warning was shown first:

"OnCommand System Manager does not recommend adding disks to an aggregate from this page..."

After clicking Continue, the system returned this error:

"No existing aggregates available to which you can add the selected disk(s). Select some other disks."

This suggests that the controller does not consider 0a.00.1 eligible to be added to any existing aggregate, including aggr0.