Dell Disk Library for Mainframe (DLm) — Disk Library for Mainframe (DLm) data protection
Keep it in production past the OEM cutoff with an independent maintainer.
Buy spares now, while units still circulate on the secondary market.
It is unsupported today — set a migration timeline and budget.
Low-criticality role — document the risk, harden backups, retire on your terms.
No. Dell's last date of support for Disk Library for mainframe DLm4020 was Apr 2015 (per the Dell End-of-Life list) — it is past end of service life.
Disk Library for mainframe DLm4020 reached end of sale Apr 2010, per the Dell End-of-Life list.
Apr 2015 — per the Dell End-of-Life list.
After the last date of support, Disk Library for mainframe DLm4020 units can often be kept in production through third-party maintenance providers. Dell no longer issues software fixes, support, or hardware replacement for it.