hi all,
My QNAP have 16 disk.
it have 2 strorage pool with raid 6 and in each pool 8 disks.
also set disk 8 and 16 to hot spare .
Therefore, we don't have 3 disks per pool!
The question is this:
When raid 6 is configured and two disks are reserved for it for possible problems(in each pool), then what is the purpose of allocating another disk for hot spare?
thanks
Losing the number of disks with raid and hot spare
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Re: Losing the number of disks with raid and hot spare
Unclear description!
Each pool contains 7 disks according to this description!
Raid6 in a 7-disk pool means 5 data disks and 2 parity disks, so again the "we dont have 3 disks per pool" is very unclear?
If you decide to use a hot spare (even if raid1/5/6/10/50 is used), you minimize the time a raid is degraded.
The rebuild starts immediately, so the raid is fully functional earlier than waiting until a new disk is delivered and the broken disk replaced.
You need to judge if an additional hot spare is worth the loss of capacity.
Anyhow, a hot spare do not protect in the case a second/third (depends to used raid level)fails during a rebuild!
And keep in mind: a raid is not a replacement for a backup!
Regards
So how can a pool contains 8 disk if disk 8 and 16 set to hotspare?
Each pool contains 7 disks according to this description!
Raid6 in a 7-disk pool means 5 data disks and 2 parity disks, so again the "we dont have 3 disks per pool" is very unclear?
If you decide to use a hot spare (even if raid1/5/6/10/50 is used), you minimize the time a raid is degraded.
The rebuild starts immediately, so the raid is fully functional earlier than waiting until a new disk is delivered and the broken disk replaced.
You need to judge if an additional hot spare is worth the loss of capacity.
Anyhow, a hot spare do not protect in the case a second/third (depends to used raid level)fails during a rebuild!
And keep in mind: a raid is not a replacement for a backup!
Regards
A raid is never a substitute for backup! Never!
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Deadbolt - READ 1st post!!!
Deadbolt - information
Deadbolt - find your OP_RETURN!
VPN=VPN? No!
How to clean up your NAS after malware attack
www.raidisnotabackup.com