Fr3d wrote: kakomu wrote: Fr3d wrote:
1. Use raid (Level 1) disks locally (content is mirrored to 2 identical disks in case one fails)
2. Have a copy of all your files on a (raid1) disk OFF SITE (doesn\'t cost money to retrieve)
3. Have a copy of all your files in a cloud storage service (costs money to retrieve)
RAID is not a backup. The only reason to use RAID 1 is to maintain uptime. Otherwise, it adds complication, especially if you\'re using hardware RAID.
RAID 1 is just for local storage safety in case one disk fails. Raid 1 copies the content you
write to a mounted disk to two instead of one disk.
Again, the main goal of RAID 1 is to maintain uptime in case of hardware failure. It fails the most basic tenets of a backup. If you accidentally delete a file on a RAID array, this action is mirrored on both drives, so you cannot retrieve the data. If your OS goes belly up in a catastrophic fashion, it doesn\'t protect the data. This is compared to a separate backup system with regular, incremental backups.
Hardware RAID adds complication considering there\'s no standard implementation of data on a RAID array. This means that data may not be retrievable if the hardware goes bad unless you can find the same make and model. Software RAID is less of a problem in this regard, but can also be difficult to set up.
Fr3d wrote:
Trust me, you will prefer to have a RAID disk
instead of having to retrieve you files from another location or some cloud storage in case your
local disk fails. This is just one component of a good backup strategy.
A quality backup will have 2 copies of all data (more copies for more important data). If your local OS disk fails, you just get a new HDD, reinstall your OS and retrieve your data from your local backup. If your local backup fails, you get a new HDD and re back up your data. If both fail at the same time (not likely), then you can get it from whatever off-site backup or optical discs you may have.
In either situation, RAID 1 will just be a means to maintain uptime between failure and integration of a new disk. It doesn\'t offer any intrinsic backup benefits.
Fr3d wrote:
There is no added complication if you use an external disk with hardware raid
(Western Digital Studio II, Lacie etc...).
If the disk enclosure fails and you want to retrieve the data from the disk, you\'re more than likely screwed unless you can find the exact same enclosure elsewhere.
Fr3d wrote: kakomu wrote: Fr3d wrote:
1. Use raid (Level 1) disks locally (content is mirrored to 2 identical disks in case one fails)
2. Have a copy of all your files on a (raid1) disk OFF SITE (doesn\'t cost money to retrieve)
3. Have a copy of all your files in a cloud storage service (costs money to retrieve)
RAID is not a backup. The only reason to use RAID 1 is to maintain uptime. Otherwise, it adds complication, especially if you\'re using hardware RAID.
RAID 1 is just for local storage safety in case one disk fails. Raid 1 copies the content you
write to a mounted disk to two instead of one disk.
Again, the main goal of RAID 1 is to maintain uptime in case of hardware failure. It fails the most basic tenets of a backup. If you accidentally delete a file on a RAID array, this action is mirrored on both drives, so you cannot retrieve the data. If your OS goes belly up in a catastrophic fashion, it doesn\'t protect the data. This is compared to a separate backup system with regular, incremental backups.
Hardware RAID adds complication considering there\'s no standard implementation of data on a RAID array. This means that data may not be retrievable if the hardware goes bad unless you can find the same make and model. Software RAID is less of a problem in this regard, but can also be difficult to set up.
Fr3d wrote:
Trust me, you will prefer to have a RAID disk
instead of having to retrieve you files from another location or some cloud storage in case your
local disk fails. This is just one component of a good backup strategy.
A quality backup will have 2 copies of all data. If your local OS disk fails, you just get a new HDD, reinstall your OS and retrieve your data from your local backup. If your local backup fails, you get a new HDD and re back up your data. If both fail at the same time (not likely), then you can get it from whatever off-site backup you may have.
In either situation, RAID 1 will just be a means to maintain uptime between failure and integration of a new disk. It doesn\'t offer any intrinsic backup benefits.
Fr3d wrote:
There is no added complication if you use an external disk with hardware raid
(Western Digital Studio II, Lacie etc...).
If the disk enclosure fails and you want to retrieve the data from the disk, you\'re more than likely screwed unless you can find the exact same enclosure elsewhere.
Feb 20, 2012 at 02:33 PM
Previous versions of kakomu's message #10363038 « How long will RAW files be readable? »
