Greeting
I have a R4 24TB (4-TB RAID 5 Mac OS Extended) 16.16 TB free connected Thunderboldt 3 cable to a 16' Macbook Pro M2 MAX, 96 Ram,Sonoma 14.7.4.
I've have been backing up a 555.94 BG Database file and it. It always taking 3 1/2 hour. Tranfering ot the internal SSD on my mac Promise Uitilty Pro (Ver 24.5.7) under Performace shows a 60-68 MB/sec. Why is this transfer going so slooooowwww.
Does anyone know is the current version 5.3.1of Disk Warrior
Help please.
Brian
Hi Brian,
Is the Pegasus filesystem HFS+ or is it APFS?
HFS+
BLACK MAGIC just speed test on RAID is Write 1299 MBbs, Read 659 MBbs (connected with TBolt3 cable).
MacBook Pro internal Write 6872MBbs. Read 5103 MB/s
Current version of Disk Warrior is 5.3.1.
Hi Brian,
When copying or moving files, the speed of the transfer is directly related to the size of the files, it will take substantially longer to copy 1 million small files than to copy one large file. The reason is simple, for every file operation the directory will have to be updated or referenced and the directory is usually at the beginning of the disk, so copying a lot of small files requires a lot of long head seeks.
RAID speed is proportional to the number of disks, the more disks the faster it is (up to a point). The Pegaus R8 is much faster than the Pegasus R4.
Write speeds are often faster than read speeds, the writes are cached but the reads are straight off the disk, even the Mac's internal NVMe SSD has faster writes than reads.
1299 MBs Writes 659 MBs reads sounds about right for an R4. If you leave BM running for a while I think you'll see the writes settle down to about 700-750 MBs.
