On 05/05/2013 02:22 AM, Martin Steigerwald wrote:
Hi George!
Am Samstag, 4. Mai 2013, 11:39:59 schrieb George Mitchell:
the next update. I am using btrfs raid 1 across five 500GB Seagate
nearline drives and btrfs single on a Seagate 4TB backup drive. I am
absolutely delighted with how this system is working. This is my
primary day in and day out system. I have to date hard crashed this
system at least three times without sustaining any apparent damage to
the filesystems. Perhaps I have just been extremely lucky, but it seems
like most of the major holes have been closed at this point. Actually I
have only two significant issues currently with btrfs.
Are you aware that BTRFS RAID-1 works differently than block based RAID? BTRFS
will only be holding two copies of every data or metadata chunk on two
different drives, regardless how many drives you use. So only one drive may
fail.
Well, I think you will have notices with df output for the filesystem, but I
thought I mention it, just in case.
Thanks,
Yes indeed! I was aware of this from the beginning. All I am looking
for is duplication across hardware. The advantage of more than two
drives is that in case you lose a drive, you don't end up losing a lot
of space, and you are much less likely to end up in an unduplicated
state for a significant amount of time. But thanks for your thoughts!
What I am NOT missing about the old 3ware card is the resyncs. I used
to spend half a day doing drive resyncs when a drive dropped out for
some reason. Hardware RAID is great when it works, but I much prefer
btrfs. Software RAID has its own problems. Its gotten better I hear,
but when I used it for a long time, I was a pain. But both forms of
block RAID saved me from ever losing data. - George
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