[CentOS] iSCSI best practices

Reindl Harald h.reindl at thelounge.net
Mon Dec 12 14:18:10 UTC 2011



Am 12.12.2011 15:13, schrieb Rudi Ahlers:
> On Mon, Dec 12, 2011 at 3:52 PM, Reindl Harald <h.reindl at thelounge.net> wrote:
>>
>>
>> Am 12.12.2011 14:49, schrieb lhecking at users.sourceforge.net:
>>>
>>>> Outage is one thing, but having the disk volumes disappear mid-transaction can be detrimental to a file system's health.
>>>
>>>  To get this back on-topic and closer to the OP's requests, are there any
>>>  particular iscsi settings one should consider to increase resiliency and
>>>  minimise the impact of e.g. a rebooting switch? timeout settings? The
>>>  big disadvantage of iscsi is that you add another layer that can fail
>>>  (compared to having virtual machine images on a local disk).
>>
>> you should always have two links to your iSCSI device and two
>> different switches so that it does not matter if one switch
>> dies or reboots
>>
> And then you still have the iSCSI applicance / server to worry about.
> It can fail as well. Even with redundancy PSU's it could fail - the
> RAM, CPU, motherboard, controller card, expensive RAID card, etc can
> fail as well.

get the right hardware and you do not have this problem
http://h10010.www1.hp.com/wwpc/us/en/sm/WF04a/12169-304616-241493-241493-241493.html

you have TWO of all components with hotplug


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