[opensuse] Re: Problems loading opensuse on 4TB USB drive on 42.3
On 08/06/2017 02:56 PM, L A Walsh wrote:
don fisher wrote:
As I recall, linux now uses 4k sectors by default. Does that imply that "512e" is a required capability for the drive to boot?
--- Hitachi called it 512e ('e' for 'emulation'), vs. the alternative of 512n ('n' for native).
I 1st saw it in a doc from them like this one:
https://www.hgst.com/sites/default/files/resources/AFtechbrief.pdf
Which is similar to the one James mentioned @ seagate.
As for **"required to boot"** -- depends on your OS.
512e simply means that OS's that don't grok 4K-sectors can still see and use it as a 512-byte sector drive.
HOWEVER, as the docs mention, those drives that perform 512 byte emulation do so in hardware by using 2 passes over the data to write a sector -- 1st to read the rest of the 4K sector and 2nd to write the merged data back to disk.
If you don't have the emulated 512-byte capability, your OS may or may not work (w/MS OS's anything before Win7 may have problems). With Linux, will depend on your distro. My boot disk(s) are still booting off a 3-disk RAID5 using short-stroked 15K SAS drives (short-stroked, meaning only using the 'fast' half (or first part) of the disk for lower overall latency).
-l I tried build a openSuse system on this disk using first the current 42.3 distribution disk, the in desperation I tried lo load the older 42.1 distribution. Neither worked.
Just curious, with disks so cheap, why you do not employ SSDs if the seek is a big problem. 4TB SATA III Samsung is about $1500.00. The 4TB USB Seagate I am is about $100.00. I do not require the 4TB Seagate for my system. I have had problem getting reliable boots with my USB drives. I just posted so developers might be aware of a possible problem. Don -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org
On 2017-08-07 00:20, don fisher wrote:
Just curious, with disks so cheap, why you do not employ SSDs if the seek is a big problem. 4TB SATA III Samsung is about $1500.00. The 4TB USB Seagate I am is about $100.00.
Sustained write speed for SSD can be slower. Also durability (with many writes) is a concern. Some people say that when an SSD fails, it tends to fail completely and you can not recover any data.
I do not require the 4TB Seagate for my system. I have had problem getting reliable boots with my USB drives. I just posted so developers might be aware of a possible problem.
IMO, you should try with another disk that doesn't have that huge optimal I/O size. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)
On 08/06/2017 05:05 PM, Carlos E. R. wrote:
On 2017-08-07 00:20, don fisher wrote:
Just curious, with disks so cheap, why you do not employ SSDs if the seek is a big problem. 4TB SATA III Samsung is about $1500.00. The 4TB USB Seagate I am is about $100.00.
Sustained write speed for SSD can be slower. Also durability (with many writes) is a concern.
Some people say that when an SSD fails, it tends to fail completely and you can not recover any data.
I do not require the 4TB Seagate for my system. I have had problem getting reliable boots with my USB drives. I just posted so developers might be aware of a possible problem.
IMO, you should try with another disk that doesn't have that huge optimal I/O size.
I ran gparted and have examined the 4TB USB disk. For some reason the distribution DVD has the btrfs and bios grub partitions at the end of the disk. In the past, the system installer usually puts swap, btrfs, and xfs file systems in that order. I am going to delete all of the existing partitions, remake them in the order I am used to as well as adding a swap partition. I will let you know if there anything is different. Don -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org
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