Re: [CentOS] Question about a hard drive error

2010-11-16 Thread Benjamin Franz
On 11/15/2010 10:41 AM, Gilbert Sebenste wrote: Thanks John, I appreciate it! Both are being replaced after a nearby 55 KV power line shorted to ground and blew a manhole cover 50' into the air, damaging a lot of equipment over here, even those on UPS's. Nobody was hurt, thank goodness. But,

Re: [CentOS] Question about a hard drive error

2010-11-16 Thread Alan Hodgson
On November 16, 2010 08:31:05 am Benjamin Franz wrote: On 11/15/2010 10:41 AM, Gilbert Sebenste wrote: Thanks John, I appreciate it! Both are being replaced after a nearby 55 KV power line shorted to ground and blew a manhole cover 50' into the air, damaging a lot of equipment over here,

Re: [CentOS] Question about a hard drive error

2010-11-16 Thread John R Pierce
On 11/16/10 8:31 AM, Benjamin Franz wrote: In these days of multi-terabyte drives you should be looking at RAID6 instead. The chances of a 'double failure' during degraded operation/resync is too high to ignore. These days of cheap drives, I use raid10 almost exclusively. and if its at all

Re: [CentOS] Question about a hard drive error

2010-11-16 Thread Benjamin Franz
On 11/16/2010 09:25 AM, John R Pierce wrote: These days of cheap drives, I use raid10 almost exclusively. and if its at all mission critical, I like to have 1-2 hotspares. if I was deploying a new server, and its workload was at all database-centric, I'd want to use use 2.5 SAS rather than

Re: [CentOS] Question about a hard drive error

2010-11-16 Thread John R Pierce
On 11/16/10 10:41 AM, Benjamin Franz wrote: Oh, I agree - and when price is no object, or if write performance is the price spread isn't that big of a deal. a 6-drive raid-6 gives you 4x space, while a 6 drive raid-10 gives you 3X.not that big of a deal. an 8-drive RAID-6 gives you 6X

Re: [CentOS] Question about a hard drive error

2010-11-16 Thread Benjamin Franz
On 11/16/2010 10:47 AM, John R Pierce wrote: raid sets really shouldn't be much bigger than about 8 drives, anyways. rebuild times for a 12 drive raid6 would be astronomical. You are ok up to here. Rebuild time for replacement of a failed drive scales by drive size, not raid set size,

Re: [CentOS] Question about a hard drive error

2010-11-15 Thread Gilbert Sebenste
On Wed, 10 Nov 2010, John R Pierce wrote: On 11/10/10 6:58 PM, Gilbert Sebenste wrote: Hey everyone, I just got one of these today: Nov 10 16:07:54 stormy kernel: sd 0:0:0:0: SCSI error: return code = 0x0800 Nov 10 16:07:54 stormy kernel: sda: Current: sense key: Medium Error

[CentOS] Question about a hard drive error

2010-11-10 Thread Gilbert Sebenste
Hey everyone, I just got one of these today: Nov 10 16:07:54 stormy kernel: sd 0:0:0:0: SCSI error: return code = 0x0800 Nov 10 16:07:54 stormy kernel: sda: Current: sense key: Medium Error Nov 10 16:07:54 stormy kernel: Add. Sense: Unrecovered read error Nov 10 16:07:54 stormy kernel:

Re: [CentOS] Question about a hard drive error

2010-11-10 Thread John R Pierce
On 11/10/10 6:58 PM, Gilbert Sebenste wrote: Hey everyone, I just got one of these today: Nov 10 16:07:54 stormy kernel: sd 0:0:0:0: SCSI error: return code = 0x0800 Nov 10 16:07:54 stormy kernel: sda: Current: sense key: Medium Error Nov 10 16:07:54 stormy kernel: Add. Sense: