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axboe / fio

Flexible I/O Tester
GNU General Public License v2.0
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fio acting like my drive is in read only mode when I issue write commands so unable to perform write measurements #57

Closed nbyrne closed 9 years ago

nbyrne commented 9 years ago

Hi The issue occurs during random 4K or sequential 128K writes, fio complains file system I am testing is read only. The drives are in a new server just installed Windows 2008 R2 and the LSI HBA does in fact recognize the drives. The drive with errors does show in Device Manager so the Windows driver is recognizing it. But any attempt to issue write commands I see this: writeissue

Anyone got any ideas?

axboe commented 9 years ago

See this note from the HOWTO:

Note: Windows and FreeBSD prevent write access to areas of the disk containing
in-use data (e.g. filesystems).

I suspect that is your issue.

nbyrne commented 9 years ago

Thanks for getting back I will investigate some more. I have not seen this before on this firmware version and in other test systems I tested so hopefully it is in fact some thing simple like that. (the devices would not typically have any in use data. They are always freshly secure erased so never used to store any user data when we test performance).

axboe commented 9 years ago

It has to be something like that. Fio is getting a clear read-only error back, so the problem is somewhere below fio. Having a mounted (or whatever the windows nomenclature is there) file system on the drive would be the most likely explanation. But I'm really not a Windows expert, by any stretch of the imagination...

nbyrne commented 9 years ago

Probably because our firmware unstable. Not necessarily issue with fio but I will keep banging on it.

nbyrne commented 9 years ago

The problem was in this specific system Windows 2008 R2 Enterprise, the OS does not take drive online automatically when inserted into server. Instead it remains Offline so fio can't write to it. offline Now with Windows 2008 Standard edition I don't have this issue. The drive is taken online by Disk Management automatically. So you can write to it immediately. Once you enable drive to be online fio can now write data to it but I had enable this manually. Annoying issue but this was the resolution.