Re: [squid-users] HDD Configuration Recommendations

Matus UHLAR - fantomas wrote:
>> John Doe ha scritto:
>>> two disks = RAID 0 or 1
>>>
>>> RAID 1 is mirroring:
>>> - Pros: safe (goes on even with a dead HD), fast reads (from both disks)
>>> - Cons: you only use 50% of total HD space (500GB total in your case).
>>>
>>> RAID 0 is stripping:
>>> - Pros: fast reads/writes and you use 100% of total HD (1TB)
>>> - Cons: unsafe (you lose 1 HD, you lose everything).
>>>
>>> Or just don't use RAID and create a cache_dir on each HD...
>>> Best would be RAID1 for the system and no RAID for the cache_dirs I think.
>
> On 25.09.08 11:39, Marcello Romani wrote:
>> I would add that a dead or malfunctioning drive could harm service
>> uptime if the caache dirs are not on raid1.
>> Therefore I would suggest keeping everything on raid1.

The three setups which are usable with Squid and RAID are:

RAID 1 + singe cache_dir - handles HDD failure silently. At cost of half
the disk space. Q: is your cache big enough or bandwidth important
enough to warrant saving the cache data?

no-RAID + multi cache_dir - Twice the cache space. At cost of Squid goes
down with either HDD. BUT, can be manually restarted without that
cache_dir immediately on detection.

RAID 0 + single cache_dir - already been covered. Generally considered
worse than no RAID.

>
> Hmm, is squid still unable to work if one of cache dirs has problems?
> sounds like calling for bug report ;)
>

It's already reported long ago. Made it onto the worklist for Squid-3
recently. Should be done Someday Soon Now (tm) :-).

Amos

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