Software projects/OS/Slackware/Advanced usage/RAID - Revision history

Linux-SWAT: /* WIP WIP WIP HURRAID */

2012-11-28T02:11:21Z

‎WIP WIP WIP HURRAID

Linux-SWAT: /* Finalizing card 1 setup */

2012-04-18T21:10:44Z

‎Finalizing card 1 setup

Linux-SWAT at 17:18, 18 April 2012

2012-04-18T17:18:51Z

Linux-SWAT at 23:25, 17 April 2012

2012-04-17T23:25:19Z

Linux-SWAT at 22:32, 17 April 2012

2012-04-17T22:32:53Z

Linux-SWAT at 22:08, 17 April 2012

2012-04-17T22:08:40Z

Linux-SWAT at 19:43, 17 April 2012

2012-04-17T19:43:47Z

Linux-SWAT: /* RAID */

2012-04-17T19:04:26Z

‎RAID

Linux-SWAT: Created page with "= WIP WIP WIP HURRAID = * Need to properly rebuild one array while completing. = RAID = * http://en.wikipedia.org/wiki/RAID * We will use the robust native Linux software RAID. ..."

2012-04-17T19:03:10Z

Created page with "= WIP WIP WIP HURRAID = * Need to properly rebuild one array while completing. = RAID = * http://en.wikipedia.org/wiki/RAID * We will use the robust native Linux software RAID. ..."

New page

= WIP WIP WIP HURRAID =
* Need to properly rebuild one array while completing.

= RAID =
* http://en.wikipedia.org/wiki/RAID
* We will use the robust native Linux software RAID.
* It's a feature that can be used on the Pandora, although not as useful than on a PC or a server.
* I will cover here only a RAID 1 (mirror) on two SD cards, as it should be the more interesting for a server usage because under read load, you can reach about 27MB/s against 16MB/s on one card.
* A SD + USB drive can also work although untested. As a two SD + USB drive.

= Partitioning =
* So you have to partition your system SD card differently than the default SL4P setup.
* In this example, we will use the recommended minimal 8G card for the slot 1.
* You can use a different sized card for the right slot. The minimum size is 4G for this second card, and we will use 4G in this example.
* The RAID 1 partitions must have the same exact size.

= Card 1 =
* Partition that way:
6G ext2 for the system
256M for the swap
1.5G unformated RAID
* We left 256M free. NEVER fill an entire drive with a RAID array. Drives, ie. all 8G, doesn't necessary offer the same exact capacity, so you can get in trouble if you add a drive 32MB short.

= Card 2 =
256M for the swap
1.5G unformated RAID
2G unused. Do what you want with it.

= Create the RAID 1 array =

= Make the RAID permanent =

= Remove a drive from the array =
* It's likely to be the one in the right SD slot.

= Repair the array =
* Depending the size of your RAID partition and he data on it, it can take a while.

@@ Line 1: / Line 1: @@
 = WIP WIP WIP HURRAID =
-* Need to properly rebuild one array while completing.
+* Need to properly rebuild one array while completing this Wiki section.
 * For now, don't try this incomplete tutorial unless you have some RAID knowledge
 * Once finished and this warning removed, go for it.

@@ Line 42: / Line 42: @@
 = Finalizing card 1 setup =
 * As root:
   cfdisk

← Older revision		Revision as of 17:18, 18 April 2012
Line 83:		Line 83:
	* Mount the swap:		* Mount the swap:
	swapon /dev/mmcblk1p1		swapon /dev/mmcblk1p1
		+
		+
		+	[[Category:Slackware]]
		+	[[Category:Software]]
		+	[[Category:System]]

@@ Line 1: / Line 1: @@
 = WIP WIP WIP HURRAID =
 * Need to properly rebuild one array while completing.
 = RAID =
@@ Line 6: / Line 8: @@
 * We will use the robust native Linux software RAID.
 * It's a feature that can be used on the Pandora, so let's have fun with it
-* I will cover here only a RAID 1 (mirror) on two SD cards, as it should be the more interesting for a server usage because under read load, you can reach about 27MB/s against 16MB/s on one card.
+* I will cover here only a RAID 1 (mirror) on two SD cards, as it should be the more interesting for a server usage because under read load, you should reach about 27MB/s against 16MB/s on one card.
-* A SD + USB drive can also work although untested. As a two SD + USB drive.
+* A SD + USB drive can also work although untested. Same with a two SD + USB drive configuration.
 * This array will be mounted as /srv , the standard server folder.
 = Partitioning =
-* So you have to partition your system SD card differently than the default SL4P setup.
+* So you have to partition your system SD card a bit differently than the default SL4P setup.
 * In this example, we will use the recommended minimal 8G card for the slot 1.
-* You can use a different sized card for the right slot. The minimum size is 4G for this second card, and we will use 4G in this example.
+* You can use a different sized card for the right slot. To keep thing interesting, the minimum size is 4G for this second card, and we will use 4G in this example.
 * The RAID 1 partitions must have the same exact size.
 = Card 1 =
 * Partition that way:
-G ext2 for the system
+G ext2 for the system.
-M for the swap
+M for the swap.
 That's all for now, the third partition will be created under Slackware, and will be:
-.5G RAID
+.5G RAID.
 * We will left 256M free. NEVER fill an entire drive with a RAID array. Drives, ie. all 8G, doesn't necessary offer the same exact capacity, so you can get in trouble if you add a drive 32MB short.
 = Card 2 =
-M for the swap
+M for the swap. Having swap on two different cards is a good thing.
 That's all for now, the other partitions will be created under Slackware, and will be:
-.5G unformated RAID
+.5G unformated RAID.
 G unused. Do what you want with it.
@@ Line 48: / Line 50: @@
 = Create the RAID 1 array =
   mdadm --create /dev/md0 --level 1 --raid-devices 2 /dev/mmcblk0p3 /dev/mmcblk1p2
 = Format the RAID array =
   mkfs.ext2 /dev/md0
@@ Line 71: / Line 76: @@
 = Remove a drive from the array =
 * It's likely to be the one in the right SD slot.
 = Repair the array =
 * Depending the size of your RAID partition and he data on it, it can take a while.

@@ Line 5: / Line 5: @@
 * http://en.wikipedia.org/wiki/RAID
 * We will use the robust native Linux software RAID.
-* It's a feature that can be used on the Pandora, although not as useful than on a PC or a server.
+* It's a feature that can be used on the Pandora, although not as useful than on a PC or a server, so let's have fun with it
 * I will cover here only a RAID 1 (mirror) on two SD cards, as it should be the more interesting for a server usage because under read load, you can reach about 27MB/s against 16MB/s on one card.
 * A SD + USB drive can also work although untested. As a two SD + USB drive.