diff options
author | martin f. krafft <madduck@debian.org> | 2009-03-09 16:45:01 +0100 |
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committer | martin f. krafft <madduck@debian.org> | 2009-03-09 16:46:36 +0100 |
commit | 98a2dee0543c3d6fceeffb904a0a3959105bc677 (patch) | |
tree | 8cd89c9da7c861eb15cb821099ffa3f35c53853b /debian/FAQ | |
parent | db7c9194514f7b8b2d00a8f4333554e8e127a7a6 (diff) |
remove trailing whitespace
Diffstat (limited to 'debian/FAQ')
-rw-r--r-- | debian/FAQ | 22 |
1 files changed, 11 insertions, 11 deletions
@@ -59,11 +59,11 @@ The latest version of this FAQ is available here: mdadm --detail /dev/mdX | sed -ne 's,.*Version : ,,p' to determine the superblock version of a running array, or - + mdadm --examine /dev/sdXY | sed -ne 's,.*Version : ,,p' to determine the superblock version from a component device of an array. - + Version 0 superblocks (00.90.XX) '''''''''''''''''''''''''''''''' You need to know the preferred minor number stored in the superblock, @@ -111,7 +111,7 @@ The latest version of this FAQ is available here: space. For example, if you have disks of size X, then in order to get 2X storage, you need 3 disks for RAID5, but 4 if you use RAID10 or RAID1+0 (or RAID6). - + This gain in usable space comes at a price: performance; RAID1/10 can be up to four times faster than RAID4/5/6. @@ -206,7 +206,7 @@ The latest version of this FAQ is available here: RAID1+0/10 has a greater chance to survive two disk failures, its performance suffers less when in degraded state, and it resyncs faster after replacing a failed disk. - + See http://aput.net/~jheiss/raid10/ for more details. 7. Which RAID10 layout scheme should I use @@ -239,7 +239,7 @@ The latest version of this FAQ is available here: hdd4 Bb1 Db1 .... Ba2 Da2 Where the second set start half-way through the drives. - + The advantage of far= is that you can easily spread a long sequential read across the drives. The cost is more seeking for writes. offset= can possibly get similar benefits with large enough chunk size. Neither upstream @@ -266,7 +266,7 @@ The latest version of this FAQ is available here: * dm-crypt * EVMS * The array is used by a process (check with `lsof') - + 9. Should I use RAID0 (or linear)? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ No. Unless you know what you're doing and keep backups, or use it for data @@ -290,7 +290,7 @@ The latest version of this FAQ is available here: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In certain configurations, especially if your last partition extends all the way to the end of the disk, mdadm may display a warning like: - + mdadm: WARNING /dev/hdc3 and /dev/hdc appear to have very similar superblocks. If they are really different, please --zero the superblock on one. If they are the same or overlap, please remove one from the DEVICE @@ -313,7 +313,7 @@ The latest version of this FAQ is available here: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In almost all cases, mdadm updates the super-minor field in an array's superblock when assembling the array. It does *not* do this for RAID0 - arrays. Thus, you may end up seeing something like this when you run + arrays. Thus, you may end up seeing something like this when you run mdadm -E or mkconf: ARRAY /dev/md0 level=raid0 num-devices=2 UUID=abcd... @@ -438,7 +438,7 @@ The latest version of this FAQ is available here: 2 0/0 1/1 1/1 1/1 3 0/0 1/1 2/2 2/2 4 0/0 1/2 2/2 3/3 - 5 0/0 1/2 2/2 3/3 + 5 0/0 1/2 2/2 3/3 6 0/0 1/3 2/3 3/3 7 0/0 1/3 2/3 3/3 8 0/0 1/4 2/3 3/4 @@ -450,7 +450,7 @@ The latest version of this FAQ is available here: 19. What should I do if a disk fails? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Replace it as soon as possible: - + mdadm --remove /dev/md0 /dev/sda1 halt <replace disk and start the machine> @@ -460,7 +460,7 @@ The latest version of this FAQ is available here: array? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Did you read the previous question and its answer? - + For cases when you have two copies of each block, the question is easily answered by looking at the output of /proc/mdstat. For instance on a four disk array: |