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H730P RAID1 (new Disks) performs poor againg RAID5 with old Disks
Hi,
i have a H740 PE Server with Windows 2019, three RAID sets and a single HDD attached to H730P.
RAID1 with 2x300GB SSD, RAID1 with 2x8TB (6G) drives and a RAID5 with 3x 2TB WD RE4 Disks.
If i copy 300GB (Very large Files) from the Single Disc to RAID5 i get about 180MB/s.
If i copy 300GB (Very large Files) from the Single Disc to RAID1 i get about 100MB/s.
And if i copy 50GB from local RAID1-SSD to this RAID1 i get about 25MB/s.
Why is this new RAID1 set (2x8TB with Seagate and Toshiba) performing so poor.
I asked Dell support, but they only argue that the 8TB is only SATA 6G...
That the 8 year old 2TB WD RE4 Disks with 3G performance better is not noteworthy to Dell Support.
Any idea?
kind regards
Jürgen
JuergenBar
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February 16th, 2020 12:00
Hi,
i have a R740 with H730p and 2 8TB SATA Disks in a Backup Server (Backup Exec).
The Disks are configured in RAID1 and for the past weeks the Backup Performance was fine.
I got About 12GB/min with These two disks
TOSHIBA MG06ACA800EY
Seagate ST8000NM0205-2FF112
but for the last few days the Performance is very poor.
Backup Jobs are starting with 12GB/s (sometime 35GB/s because of RAID Cache) and after a few minutes the jobrate Fails to 2.5GB/s.
File Copys of 20GB with Explorer start About 1GB/s and Fails after a few seconds down to 30MB/s.
Other disks at the h730P can write with About 120MB/s or 160GB/s.
I tried different Cache rule Settings (current is read ahaed, write back, Cache enabled).
Any idea?